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CN114192574A - Endless continuous casting and rolling production process for bar and wire products - Google Patents

Endless continuous casting and rolling production process for bar and wire products Download PDF

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Publication number
CN114192574A
CN114192574A CN202111485659.7A CN202111485659A CN114192574A CN 114192574 A CN114192574 A CN 114192574A CN 202111485659 A CN202111485659 A CN 202111485659A CN 114192574 A CN114192574 A CN 114192574A
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rolling
billet
temperature
continuous casting
electromagnetic induction
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Inventor
林炳生
杨立航
王世立
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Yunnan Qu Jing Cheng Gang Iron And Steel Group Co ltd
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Yunnan Qu Jing Cheng Gang Iron And Steel Group Co ltd
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Priority to CN202111485659.7A priority Critical patent/CN114192574A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/20—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a non-continuous process,(e.g. skew rolling, i.e. planetary cross rolling)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

本发明公开了一种棒线材产品无头连铸连轧生产工艺,包括以下步骤:①连铸:先将精炼后的钢水注入中间包和结晶器中，利用拉矫机从结晶器的出口拉出得到连铸坯；②初轧：将步骤①制得的连铸坯送入初轧机组进行初轧得到中间坯；③中间坯的对接连接:把经过步骤②粗轧后的前行中间坯和紧接着该前行中间坯的后续中间坯对接组焊；④中间坯的补温：对步骤③对接后的中间坯进行温度检测，若温度达到连轧机组入口温度要求，则不进行补温，若温度不足，则需进行补温；⑤连轧；⑥精轧减径；⑦冷却。本方法不仅节约了建造的成本，降低了装置的能耗，简化了施工操作的工序，而且有效的提高了棒材产品的连铸连轧质量，提高了生产效率。

Figure 202111485659

The invention discloses a production process for endless continuous casting and rolling of rod and wire products, which comprises the following steps: 1. Continuous casting: firstly inject refined molten steel into a tundish and a mold, and use a tension leveler to pull out the mold from the outlet of the mold 2. Preliminary rolling: the continuous casting slab obtained in step 1 is sent to the blooming unit for preliminary rolling to obtain an intermediate billet; 3. the butt connection of the intermediate billet: the forward intermediate billet after step 2. rough rolling is carried out. Butt group welding with the subsequent intermediate billet next to the preceding intermediate billet; ④ Warming up of the intermediate billet: The temperature of the intermediate billet after the butt joint in step ③ is checked, if the temperature reaches the inlet temperature requirement of the continuous rolling mill, no warm-up , if the temperature is insufficient, it needs to be supplemented; ⑤ continuous rolling; ⑥ finishing rolling reduction; ⑦ cooling. The method not only saves the construction cost, reduces the energy consumption of the device, and simplifies the construction operation procedure, but also effectively improves the continuous casting and rolling quality of the bar product, and improves the production efficiency.

Figure 202111485659

Description

Rod and wire rod product endless continuous casting and rolling production process
Technical Field
The invention belongs to the technical field of steelmaking production, and particularly relates to a continuous casting and rolling production process for a rod and wire rod product without heads.
Background
China is the first major steel country in the world, and according to incomplete statistics of relevant mechanisms in the industry, the yield of crude steel in China exceeds 10 hundred million tons and the yield of steel exceeds 12 hundred million tons by the end of 2020. The steel industry is the industrial foundation of China and is also the pillar for national defense construction. However, with the surplus of domestic steel production capacity and the aggravation of environmental protection pressure, the steel industry needs to conspire to become developed. The endless continuous casting and rolling technology is a core technology in the field of steel and iron, and the technology develops a comparative block in the field of plate strips, for example, ESP continuous casting and rolling has been developed sufficiently and is located in a lead position worldwide. The rod and wire products occupy the half-wall Jiangshan of the steel market and play an important role in national economy and basic industry, so the continuous casting and rolling technology of the rod and wire is the key of overcoming the difficulty of the people. In the competitive steel market, if a new mode is not actively transformed and innovated, the steel market faces the eliminated fate. The rod and wire mainly refers to a rod and a wire, the endless continuous casting and rolling technology of the rod and wire mainly cancels the cutting and heating processes of a continuous casting area, reduces the consumption of fuel and the loss of metal, only cancels the casting blank cutting and heating processes of the continuous casting area, and improves the metal yield by 2.5 percent, the endless continuous casting and rolling technology is a major leap development on the steel processing flow, and integrates steel making, continuous casting and steel rolling, and the production process is smooth, the equipment layout is compact, the factory building occupies less land, improves the metal yield, saves energy, and in addition, the automatic high concentration and unified management enable the steel flow to be continuous and short, and improves the steel flow to an unprecedented height. The existing rod and wire rod endless continuous casting process has some defects in the using process, firstly, the continuous casting billet of the continuous casting billet withdrawal and straightening machine has more slag inclusion, unstable quality and uneven surface temperature of the continuous casting billet, so that the quality and the size of an intermediate billet after primary rolling cannot well meet the subsequent requirement of butt joint; secondly, the existing butt joint process of the intermediate billet is complicated, the matched structure is complex, the investment cost is high, the joint connection strength of the butt joint intermediate billet is low, and the condition of fracture can exist in the continuous rolling process; thirdly, the temperature control heating device after the butt joint of the intermediate billets cannot realize automatic temperature control, which can cause the condition that the temperature of the intermediate billets after temperature compensation is overhigh, and then the efficiency and the quality of continuous rolling are influenced. Therefore, the invention aims to provide the endless continuous casting and rolling production process for the bar and wire products, which has the advantages of short process flow, easy operation, low energy consumption, capability of reducing the processing cost and effectively improving the product quality and the production efficiency.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a continuous casting and rolling production process for rod and wire products, which has the advantages of short process flow, easiness in operation, low energy consumption, capability of reducing the processing cost and effectively improving the product quality and the production efficiency.
The invention relates to a continuous casting and rolling production process for a rod and wire product without heads, which comprises the following steps:
firstly, continuous casting, namely injecting refined molten steel into a tundish to ensure that the superheat degree of the molten steel in the tundish is 30-40 ℃, then injecting the molten steel in the tundish into a crystallizer for cooling, wherein the surface of the molten steel in the crystallizer is covered with protective slag for protecting the molten steel, the thickness of the protective slag is 5-10 mm, the molten steel is cooled and crystallized along the inner wall of the crystallizer to form a solidified blank taking the molten steel as a liquid core, and finally, pulling the solidified blank out of the crystallizer by using a withdrawal and straightening machine to obtain a continuous casting blank, wherein the flow rate of cooling water in the crystallizer is 130-140 m3The pulling speed of the withdrawal and straightening machine is 6.8-8.5 m/min, and the temperature of a continuous casting billet in the withdrawal and straightening machine is controlled to be 1150-1250 ℃;
second, initial rolling: sending the continuous casting blank prepared in the step one into a blooming mill set for blooming to obtain an intermediate blank, wherein the width of the intermediate blank is controlled to be 80-120 cm, the thickness of the intermediate blank is 10-20 cm, the temperature of an inlet of blooming is controlled to be 1050-1100 ℃, the speed of the blooming is controlled to be 2.0-3.0 m/s, the intermediate blank is cooled by water spraying after being discharged from the blooming mill set, and the surface temperature is controlled to be 950-980 ℃;
the butt joint of the intermediate billet is that the forward intermediate billet after the rough rolling and the subsequent intermediate billet next to the forward intermediate billet are output by a conveying roller 1, the head of the subsequent intermediate billet and the tail of the forward intermediate billet are positioned and centered by a positioning mechanism in the process of conveying the forward intermediate billet and the subsequent intermediate billet by the conveying roller 1, then the tail of the forward intermediate billet is sheared into a first gap by a front shearing machine 2, the head of the subsequent intermediate billet is sheared into a second gap by a rear shearing machine 3, then the butt joint gap of the first gap and the second gap is controlled not to be more than 2mm, a welding groove 6 is formed between the first gap and the second gap, then a welding wire is conveyed to the welding groove 6 by a laser ray emitted by a laser ray welding device 5 by a welding wire conveyor 4 for laser ray oscillation welding, the oscillation direction of the laser ray is vertical to the welding direction, the oscillation frequency of the laser ray is at least 400-500 HZ, and the oscillation amplitude of the laser ray is 1-1.5 mm;
fourthly, temperature compensation of the intermediate blank: detecting the temperature of the intermediate billet after the butt joint in the step three, if the temperature meets the requirement of the inlet temperature of the continuous rolling unit, not performing temperature compensation, if the temperature is insufficient, performing temperature compensation on the continuous casting billet by using an automatic heating device, and performing head cutting before the intermediate billet enters the continuous rolling unit;
continuous rolling: introducing the intermediate billet subjected to temperature compensation in the step IV into a rolling mill of a continuous rolling unit to carry out continuous rolling to obtain a primary rolled piece, wherein the continuous rolling unit comprises rough rolling, intermediate rolling and pre-finish rolling procedures, the inlet temperature of the rough rolling is controlled to be 1020-1050 ℃, the speed is controlled to be 1.5-2.5 m/s, the number of rough rolling passes is 5-7, the inlet temperature of the intermediate rolling is controlled to be 980-1000 ℃, the speed is controlled to be 1.5-2.5/s, the number of intermediate rolling passes is 5-7, the inlet temperature of the pre-finish rolling is controlled to be 940-960 ℃, the speed is controlled to be 2.5-3.5 m/s, and the number of pre-finish rolling passes is 3-5;
sixthly, fine rolling and reducing: cutting off the head of the primary rolled piece after the continuous rolling in the fifth step by flying shears, then, allowing the primary rolled piece to enter a reducing sizing mill set for finish rolling and reducing to obtain a rod and wire product with a target specification, wherein the inlet temperature of finish rolling and reducing is controlled to be 800-850 ℃, the speed is controlled to be 5-10 m/s, and the pass of the reducing sizing mill set is 2-3 times;
and (c) cooling: and cooling the rod and wire products with the target specification by water mist, then feeding the rod and wire products with the target specification to a cooling bed, reducing the surface temperature of the rod and wire products with the target specification to below 360 ℃, collecting, cutting to length, collecting and bundling.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the invention can realize that the continuous casting billet is directly fed into a primary rolling mill set for rolling after being pulled out from the crystallizer, heating, heat supplementing and post-treatment processes are omitted, the direct feeding and direct rolling technology of the continuous casting billet is realized, meanwhile, the invention not only can lead the continuous casting billet to be directly fed into a rolling mill through a high-speed roller way after being cut off by reasonably controlling the temperature of a tundish, the flow of cooling water in the crystallizer and the pulling speed of a withdrawal and straightening machine in the continuous casting process, but also can lead the surface temperature of the continuous casting billet to basically reach the initial rolling temperature when in conventional rolling, lead the central temperature of the continuous casting billet to be much higher than the surface temperature, lead the continuous casting billet to be easy to deform and deeply penetrate in the primary rolling mill set, be beneficial to the pressing and elimination of the internal defects of the continuous casting billet and promote the improvement of the internal quality of the casting billet, in addition, add protective slag on the surface of molten steel, lead the protective slag to reduce the situations of longitudinal cracking and adhesive leakage on the surface of the continuous casting billet, and avoid slag inclusion, the quality and the qualification rate of the continuous casting billet can be effectively improved;
the butt joint method adopted by the invention is advanced, the shearing machine is firstly adopted to shear the grooves at the end parts of the corresponding intermediate billets, and the sheared grooves are connected end to end by utilizing the laser ray molten metal welding wires, so that the welding method is changed, the welding speed is high, the production cost and the process complexity are effectively reduced, and the welding mode of the metal welding wire melting is adopted, so that the connection strength between welding joints can be effectively increased, the problem of breakage of the intermediate billet joints in the continuous rolling process is thoroughly solved, the continuous rolling quality of the intermediate billets can be effectively ensured, and the production efficiency of the continuous rolling is further improved;
the heating device can lead the temperature of the whole section of the intermediate billet to meet the requirement of rolling temperature when entering the continuous rolling mill, and effectively ensures the quality of rolled products.
In conclusion, the invention simplifies the flow of continuous casting and rolling, the whole production process flow is advanced, the operation is easy, the development of the invention not only saves the construction cost, reduces the energy consumption of the device and simplifies the working procedure of construction operation, but also effectively improves the continuous casting and rolling quality of bar products, further improves the production efficiency, can bring better production benefit for enterprises, and is easy to popularize and use.
Drawings
FIG. 1 is a schematic view of a flow structure of a butt joint and temperature compensation process in conveying of conveying rollers between a primary rolling unit and a continuous rolling unit;
fig. 2 is a schematic top view of the lower electromagnetic induction heating plate 15;
in the figure: 1-conveying roller, 2-front shearing machine, 3-rear shearing machine, 4-welding wire conveying machine, 5-laser ray welding device, 6-welding groove, 7-first portal frame, 8-second portal frame, 9-infrared thermometer, 10-upper side lifting mechanism, 11-upper supporting frame body, 12-upper side electromagnetic induction heating plate, 13-lower side lifting mechanism, 14-lower supporting frame body, 15-lower side electromagnetic induction heating plate, 16-controller, 17-heating plate body, 18-first joint part, 19-second joint part and 20-heating part.
Detailed Description
The invention is further illustrated by the following description of embodiments and the accompanying drawings, without in any way limiting the invention, and any alterations or substitutions made on the basis of the teachings of the invention shall fall within the scope of protection of the invention.
Example 1
The endless continuous casting and rolling production process of the rod and wire product in the embodiment 1 comprises the following steps:
firstly, continuous casting, namely, firstly, injecting the refined molten steel into a tundish, ensuring that the superheat degree of the molten steel in the tundish is 30 ℃, and controlling the temperature of the molten steel in the tundishOptimizing, reducing the influence of the over-low temperature of molten steel in the tundish on the fluidity of the molten steel, reducing the increase of casting cost caused by the over-high temperature of molten steel in the tundish, avoiding the influence of the over-low temperature of molten steel in the tundish on the fluidity reduction of the molten steel and the occurrence of casting break, then injecting the molten steel in the tundish into a crystallizer for cooling, covering a protective slag for protecting the molten steel on the surface of the molten steel in the crystallizer, wherein the thickness of the protective slag is 5mm, cooling and crystallizing the molten steel along the inner wall of the crystallizer to form a solidified blank taking the molten steel as a liquid core, and finally drawing the solidified blank out of the crystallizer by a withdrawal and straightening machine to obtain a continuous casting blank, wherein the flow rate of cooling water in the crystallizer is 130m3The pulling speed of the withdrawal and straightening machine is 6.8m/min, the temperature of a continuous casting billet in the withdrawal and straightening machine is controlled to be 1150 ℃, the cooling water flow and the pulling speed of a crystallizer are optimized, the pressing and elimination of internal defects of the continuous casting billet are facilitated, the improvement of the internal quality of the casting billet is promoted, and the stability of continuous casting production of the continuous casting billet is improved;
further, in the step I, the molten steel covering slag comprises, by mass, 30% of calcium oxide, 36% of silicon dioxide, 6% of aluminum oxide, 5% of magnesium oxide, 10% of sodium oxide, 5% of calcium fluoride, 2% of carbon, 5% of single-layer graphene, and R21% of O alkali metal oxide, adding the covering slag into the crystallizer, wherein the covering slag covers the liquid level of molten steel in the crystallizer, meanwhile, when the molten steel is cooled and crystallized in the crystallizer to form a primary finished product, part of the covering slag also flows into a gap formed between the primary finished product and the crystallizer, so that good lubricating and heat transfer effects are achieved, uniform growth of a primary solidified blank shell is promoted, the continuous casting production stability of a continuous casting blank is improved, and the quality and the qualification rate of the continuous casting blank are improved;
further, in the step I, three-stage water distribution is arranged between the crystallizer and the withdrawal and straightening machine to control the temperature of the continuous casting billet in the withdrawal and straightening machine, the three-stage water distribution is arranged to improve the cooling strength of the continuous casting billet at a specific withdrawal speed and simultaneously ensure that the surface of the continuous casting billet can be uniformly cooled horizontally and longitudinally, the three-stage water distribution sequentially comprises foot roll water, first area water and second area water, and the water flow of the foot roll is 7m3H, water flow rate of the first zone is 11.5 m3H, the water flow of the second zone is 9.0 m3H, three-stage water distribution and specific flow controlThe horizontal and longitudinal cooling of the surface of the continuous casting billet can be further improved, the quality of the continuous casting billet is improved, and the improvement of the internal quality of the casting billet after entering the primary rolling process is further promoted;
second, initial rolling: sending the continuous casting billet prepared in the first step into a blooming mill group for blooming to obtain an intermediate billet, wherein the blooming mill group adopts a steel rolling system used in the prior art, 5-pass rolling is preferably adopted for rolling the intermediate billet, the width of the intermediate billet is controlled to be 80cm, the thickness of the intermediate billet is 10cm, the inlet temperature of blooming is controlled to be 1050 ℃, the speed is controlled to be 2.0m/s, the intermediate billet is subjected to water spray cooling after exiting from the blooming mill group, the surface temperature is controlled to be 950 ℃, the blooming mill group is arranged behind a withdrawal and straightening machine, the distance from the inlet of the withdrawal and straightening machine to the inlet of the blooming mill after a continuous casting machine is preferably 10m, the temperature drop of the continuous casting billet is reduced, the inlet temperature of the continuous casting billet entering the blooming mill group can be increased, the motor load of the blooming mill group is reduced, the failure rate in the production process is reduced, the yield is increased, the energy consumption is reduced, and the yield is increased;
the butt joint of the intermediate billet is that the forward intermediate billet after the rough rolling and the subsequent intermediate billet next to the forward intermediate billet are output by a conveying roller 1, the tail part of the forward intermediate billet and the head part of the subsequent intermediate billet are positioned and centered by a positioning mechanism in the process of conveying the forward intermediate billet and the subsequent intermediate billet by the conveying roller 1, then the tail part of the forward intermediate billet is sheared into a first gap by a front shearing machine 2, the head part of the subsequent intermediate billet is sheared into a second gap by a rear shearing machine 3, then the butt joint gap of the first gap and the second gap is controlled not more than 2mm, a welding groove 6 is formed between the first gap and the second gap, the welding groove 6 is preferably of a U-shaped structure, and then a metal welding wire is conveyed to the laser ray welding groove 6 emitted by a laser ray welding device 5 by a welding wire conveyor 4 to carry out laser ray oscillation welding, the welding of the advancing intermediate billet and the subsequent intermediate billet is realized by conveying a metal welding wire with stable austenite performance into a molten pool generated by laser rays, the oscillation direction of the laser rays is vertical to the welding direction, the oscillation frequency of the laser rays is at least 400HZ, and the oscillation amplitude of the laser rays is 1 mm; the laser ray is oscillated transversely to the welding direction, so that the welding seam is further uniform, the welding quality is improved, and the connection strength of the forward intermediate blank and the subsequent intermediate blank can be improved through the oscillation of the laser ray; the amplitude of the laser beam oscillation, which in this order of magnitude allows high welding speeds and therefore high productivity of the welding method, to be achieved, can be achieved by means of a compact-design laser beam directing device, preferably by means of a rotating or oscillating deflecting mirror;
further, in the third step, the metal welding wire consists of the following components in percentage by mass: iron 70%, aluminium 10%, carbon 1%, silicon 4%, manganese 2%, chromium 2%, molybdenum 5%, nickel 5% and 1% cerium, with which the use of the method according to the invention in a very reliable manner in the application of butted intermediate blanks, makes it possible to ensure complete transformation of the weld into a martensitic structure, increasing the joining strength;
furthermore, in the third step, the metal welding wire needs to be preheated to 70 ℃ before being delivered to the molten pool, so that higher process speed or higher production rate can be realized;
fourthly, temperature compensation of the intermediate blank: detecting the temperature of the intermediate billet after the butt joint in the step three, if the temperature meets the requirement of the inlet temperature of the continuous rolling unit, not performing temperature compensation, if the temperature is insufficient, performing temperature compensation on the continuous casting billet by using an automatic heating device, and performing head cutting before the intermediate billet enters the continuous rolling unit;
further, in the fourth step, the automatic heating device includes a first gate frame 7 and a second gate frame 8 which are arranged between the conveying rollers 1, the first gate frame 7 is provided with an infrared thermometer 9, the infrared thermometer 9 is a conventional art, an upper lifting mechanism 10 is arranged between the first gate frame 7 and the second gate frame 8 above the conveying rollers 1, an upper supporting frame body 11 is arranged below the upper lifting mechanism 10, a plurality of upper electromagnetic induction heating plates 12 are arranged on the upper supporting frame body 11 at equal intervals, a lower lifting mechanism 13 is arranged between the first gate frame 7 and the second gate frame 8 below the conveying rollers 1, a lower supporting frame body 14 is arranged below the lower lifting mechanism 13, a plurality of lower electromagnetic induction heating plates 15 are arranged on the lower supporting frame body 14 at equal intervals, a controller 16 is arranged outside the conveying rollers 1, and the infrared thermometer 9, The upper side lifting mechanism 10, the upper side electromagnetic induction heating plate 12, the lower side lifting mechanism 13 and the lower side electromagnetic induction heating plate 15 are electrically connected with the controller 16, the upper side electromagnetic induction heating plate 12 and the lower side electromagnetic induction heating plate 15 have the same structure and respectively comprise a heating plate body 17 and an electromagnetic induction coil, the electromagnetic induction coil comprises a first joint part 18, a second joint part 19 and a heating part 20 arranged between the first joint part 18 and the second joint part 19, the heating part 20 is arranged in a serpentine structure, the heating plate body 17 is provided with an installation groove for installing the electromagnetic induction coil, during installation, the electromagnetic induction coil 12 of the upper side electromagnetic induction heating plate is installed on the lower surface of the heating plate body 17, the electromagnetic induction coil of the lower side electromagnetic induction heating plate 15 is installed on the upper surface of the heating plate body 17, and the electromagnetic induction coil is arranged in the installation groove of the heating plate body 17, the problem that adjacent coils are easy to be short-circuited is avoided, and the utilization rate of the alternating magnetic field is improved, so that the heating efficiency is improved;
the method for supplementing the temperature of the intermediate billet by the automatic heating device comprises the following steps: respectively inputting data such as the inlet rolling temperature of the continuous rolling of the intermediate billet, the section size of the intermediate billet, the conveying speed of the intermediate billet and the like on an operation interface of a controller 16, then conveying the intermediate billet to the direction of the continuous rolling mill by using conveying rollers 1, acquiring real-time temperature data of the intermediate billet by using an infrared thermometer 9 when the intermediate billet passes below the infrared thermometer 9, transmitting the temperature data to a control system of the controller 16, comparing the real-time temperature data of the intermediate billet with target rolling temperature data by using the controller, sending a control instruction to an upper electromagnetic induction heating plate 12 and a lower electromagnetic induction heating plate 15 by using the controller when the real-time temperature of the intermediate billet is lower than the target rolling temperature, automatically calculating the heat compensation amount required by the intermediate billet by using the controller, and after receiving the control instruction by the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15, the controller 16 controls the upper lifting mechanism 10 to drive the upper electromagnetic induction heating plate 12 to move downwards, controls the lower lifting mechanism 13 to drive the lower electromagnetic induction heating plate 15 to move upwards, controls the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15 to be electrified to supplement the temperature of the intermediate billet, controls the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15 to stop being electrified after the temperature supplementing operation is completed, and directly enters the continuous rolling mill set to complete rolling of the intermediate billet after the heat supplementing operation is completed;
continuous rolling: introducing the intermediate billet subjected to temperature compensation in the step (iv) into a rolling mill of a continuous rolling unit to carry out continuous rolling to obtain a primary rolled piece, wherein the continuous rolling unit comprises the working procedures of rough rolling, intermediate rolling and pre-finish rolling, the inlet temperature of the rough rolling is controlled at 1020 ℃, the speed is controlled at 1.5m/s, the number of passes of the rough rolling is 5, the inlet temperature of the intermediate rolling is controlled at 980 ℃, the speed is controlled at 1.5/s, the number of passes of the intermediate rolling is 5, the inlet temperature of the pre-finish rolling is controlled at 940 ℃, the speed is controlled at 2.5m/s, and the number of passes of the pre-finish rolling is 3; the intermediate billet is deformed and permeated into the core part of the casting blank by applying large pass deformation, so that the defects of core segregation, looseness and the like are reduced, and the compression deformation of the continuous rolling unit is used for matching the continuous casting tapping speed and the continuous rolling steel feeding speed, so that the intermediate billet meets the rolling condition of the continuous rolling unit, and the continuous casting and rolling production is realized;
sixthly, fine rolling and reducing: cutting off the head of the primary rolled piece after the continuous rolling in the fifth step by flying shears, then entering a reducing sizing mill set for finish rolling and reducing to obtain a rod and wire product with the target specification, wherein the inlet temperature of the finish rolling and reducing is controlled at 800 ℃, the speed is controlled at 5m/s, and the pass of the reducing sizing mill set is 2 times;
and (c) cooling: and cooling the rod and wire products with the target specification by water mist, then feeding the rod and wire products with the target specification to a cooling bed, reducing the surface temperature of the rod and wire products with the target specification to below 360 ℃, collecting, cutting to length, collecting and bundling.
Example 2
The endless continuous casting and rolling production process of the rod and wire product in the embodiment 2 comprises the following steps:
firstly, continuous casting, namely, firstly, injecting the refined molten steel into a tundish, ensuring that the superheat degree of the molten steel in the tundish is 35 ℃, and the temperature of the molten steel in the tundish is controlledOptimizing to reduce the influence of too low temperature of molten steel in the tundish on the fluidity of the molten steel and reduce the increase of casting cost caused by too high temperature of molten steel in the tundish, avoiding the condition that the influence of too low temperature of molten steel in the tundish on the fluidity reduction of the molten steel causes broken casting, then injecting the molten steel in the tundish into a crystallizer for cooling, covering a protective slag for protecting the molten steel on the surface of the molten steel in the crystallizer, wherein the thickness of the protective slag is 8mm, the molten steel is cooled and crystallized along the inner wall of the crystallizer to form a solidified blank taking the molten steel as a liquid core, and finally drawing the solidified blank out of the crystallizer by a withdrawal and straightening machine to obtain a continuous casting blank, wherein the flow rate of cooling water in the crystallizer is 135m3The pulling speed of the withdrawal and straightening machine is 7.2m/min, the temperature of a continuous casting billet in the withdrawal and straightening machine is controlled to be 1200 ℃, the cooling water flow and the pulling speed of a crystallizer are optimized, the pressing and elimination of internal defects of the continuous casting billet are facilitated, the improvement of the internal quality of the casting billet is promoted, and the stability of continuous casting production of the continuous casting billet is improved;
further, in the step I, the molten steel casting powder comprises, by mass, 40% of calcium oxide, 34% of silicon dioxide, 5% of aluminum oxide, 4% of magnesium oxide, 7% of sodium oxide, 4% of calcium fluoride, 1.5% of carbon, 3.5% of single-layer graphene, and R21% of O alkali metal oxide, adding the covering slag into the crystallizer, wherein the covering slag covers the liquid level of molten steel in the crystallizer, meanwhile, when the molten steel is cooled and crystallized in the crystallizer to form a primary finished product, part of the covering slag also flows into a gap formed between the primary finished product and the crystallizer, so that good lubricating and heat transfer effects are achieved, uniform growth of a primary solidified blank shell is promoted, the continuous casting production stability of a continuous casting blank is improved, and the quality and the qualification rate of the continuous casting blank are improved;
further, in the step I, three-stage water distribution is arranged between the crystallizer and the withdrawal and straightening machine to control the temperature of the continuous casting billet in the withdrawal and straightening machine, the three-stage water distribution is arranged to improve the cooling strength of the continuous casting billet at a specific withdrawal speed and simultaneously ensure that the surface of the continuous casting billet can be uniformly cooled horizontally and longitudinally, the three-stage water distribution sequentially comprises foot roll water, first area water and second area water, and the water flow rate of the foot roll is 83The water flow of the first area is 11.8h, the water flow of the second area is 9.5 h, and the three-section water distribution and the specific flow control can further improve the continuous castingThe surface of the billet can be uniformly cooled horizontally and longitudinally at the same time, the quality of the continuous casting billet is improved, and the improvement of the internal quality of the casting billet after the casting billet enters the primary rolling process is further promoted;
second, initial rolling: sending the continuous casting billet prepared in the step I into a blooming mill group for blooming to obtain an intermediate billet, wherein the blooming mill group adopts a rolling mill system used in the prior art, 5 or 7 passes of rolling are preferably adopted for rolling the intermediate billet, the width of the intermediate billet is controlled to be 100cm, the thickness of the intermediate billet is 15cm, the temperature of a blooming inlet is controlled to be 1080 ℃, the speed is controlled to be 2.5m/s, the intermediate billet is sprayed with water for cooling after leaving the blooming mill group, the surface temperature is controlled to be 975 ℃, the blooming mill group is arranged behind a withdrawal and straightening machine, the distance from the withdrawal and straightening machine inlet to the roughing mill inlet after a continuous casting machine is preferably 20m, the temperature drop of the continuous casting billet is reduced, the temperature of the continuous casting billet entering the blooming mill group can be increased, the motor load of the blooming mill group is reduced, the failure rate in the production process is reduced, the yield is improved, the energy consumption is reduced, and the income is improved;
the butt joint of the intermediate billet is that the forward intermediate billet after the rough rolling and the subsequent intermediate billet next to the forward intermediate billet are output by a conveying roller 1, the head of the forward intermediate billet and the head of the subsequent intermediate billet are positioned and centered by a positioning mechanism in the process of conveying the forward intermediate billet and the subsequent intermediate billet by the conveying roller 1, then the tail of the forward intermediate billet is cut by a front shearing machine 2 to form a first notch, the head of the subsequent intermediate billet is cut by a rear shearing machine 3 to form a second notch, then the butt joint gap of the first notch and the second notch is controlled to be not more than 2mm, a welding groove 6 is formed between the first notch and the second notch, then a metal welding wire is conveyed to the welding groove 6 by a laser ray emitted by a laser ray welding device 5 by a welding wire conveyor 4 to carry out laser ray oscillation welding, and the metal welding wire with stable austenite performance is conveyed to a molten pool generated by the laser ray, the welding of the forward intermediate blank and the subsequent intermediate blank is realized, the oscillation direction of the laser ray is vertical to the welding direction, the oscillation frequency of the laser ray is at least 450HZ, and the oscillation amplitude of the laser ray is 1.2 mm; the laser ray is oscillated transversely to the welding direction, so that the welding seam is further uniform, the welding quality is improved, and the connection strength of the forward intermediate blank and the subsequent intermediate blank can be improved through the oscillation of the laser ray; the amplitude of the laser beam oscillation, which in this order of magnitude allows high welding speeds and therefore high productivity of the welding method, to be achieved, can be achieved by means of a compact-design laser beam directing device, preferably by means of a rotating or oscillating deflecting mirror;
further, in the third step, the metal welding wire consists of the following components in percentage by mass: 80% of iron, 6% of aluminium, 0.5% of carbon, 1.5% of silicon, 0.5% of manganese, 1.5% of chromium, 2% of molybdenum, 2% of nickel and 1% of cerium, with which the use of the method according to the invention in a very reliable manner in the application of butted intermediate blanks makes it possible to ensure the complete transformation of the weld into a martensitic structure, increasing the joining strength;
furthermore, in the third step, the metal welding wire needs to be preheated to 75 ℃ before being delivered to the molten pool, so that higher process speed or higher production rate can be realized;
fourthly, temperature compensation of the intermediate blank: detecting the temperature of the intermediate billet after the butt joint in the step three, if the temperature meets the requirement of the inlet temperature of the continuous rolling unit, not performing temperature compensation, if the temperature is insufficient, performing temperature compensation on the continuous casting billet by using an automatic heating device, and performing head cutting before the intermediate billet enters the continuous rolling unit;
further, in the fourth step, the automatic heating device includes a first gate frame 7 and a second gate frame 8 which are arranged between the conveying rollers 1, the first gate frame 7 is provided with an infrared thermometer 9, the infrared thermometer 9 is a conventional art, an upper lifting mechanism 10 is arranged between the first gate frame 7 and the second gate frame 8 above the conveying rollers 1, an upper supporting frame body 11 is arranged below the upper lifting mechanism 10, a plurality of upper electromagnetic induction heating plates 12 are arranged on the upper supporting frame body 11 at equal intervals, a lower lifting mechanism 13 is arranged between the first gate frame 7 and the second gate frame 8 below the conveying rollers 1, a lower supporting frame body 14 is arranged below the lower lifting mechanism 13, a plurality of lower electromagnetic induction heating plates 15 are arranged on the lower supporting frame body 14 at equal intervals, a controller 16 is arranged outside the conveying rollers 1, and the infrared thermometer 9, The upper side lifting mechanism 10, the upper side electromagnetic induction heating plate 12, the lower side lifting mechanism 13 and the lower side electromagnetic induction heating plate 15 are electrically connected with the controller 16, the upper side electromagnetic induction heating plate 12 and the lower side electromagnetic induction heating plate 15 have the same structure and respectively comprise a heating plate body 17 and an electromagnetic induction coil, the electromagnetic induction coil comprises a first joint part 18, a second joint part 19 and a heating part 20 arranged between the first joint part 18 and the second joint part 19, the heating part 20 is arranged in a serpentine structure, the heating plate body 17 is provided with an installation groove for installing the electromagnetic induction coil, during installation, the electromagnetic induction coil 12 of the upper side electromagnetic induction heating plate is installed on the lower surface of the heating plate body 17, the electromagnetic induction coil of the lower side electromagnetic induction heating plate 15 is installed on the upper surface of the heating plate body 17, and the electromagnetic induction coil is arranged in the installation groove of the heating plate body 17, the problem that adjacent coils are easy to be short-circuited is avoided, and the utilization rate of the alternating magnetic field is improved, so that the heating efficiency is improved;
the method for supplementing the temperature of the intermediate billet by the automatic heating device comprises the following steps: respectively inputting data such as the inlet rolling temperature of the continuous rolling of the intermediate billet, the section size of the intermediate billet, the conveying speed of the intermediate billet and the like on an operation interface of a controller 16, then conveying the intermediate billet to the direction of the continuous rolling mill by using conveying rollers 1, acquiring real-time temperature data of the intermediate billet by using an infrared thermometer 9 when the intermediate billet passes below the infrared thermometer 9, transmitting the temperature data to a control system of the controller 16, comparing the real-time temperature data of the intermediate billet with target rolling temperature data by using the controller, sending a control instruction to an upper electromagnetic induction heating plate 12 and a lower electromagnetic induction heating plate 15 by using the controller when the real-time temperature of the intermediate billet is lower than the target rolling temperature, automatically calculating the heat compensation amount required by the intermediate billet by using the controller, and after receiving the control instruction by the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15, the controller 16 controls the upper lifting mechanism 10 to drive the upper electromagnetic induction heating plate 12 to move downwards, controls the lower lifting mechanism 13 to drive the lower electromagnetic induction heating plate 15 to move upwards, controls the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15 to be electrified to supplement the temperature of the intermediate billet, controls the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15 to stop being electrified after the temperature supplementing operation is completed, and directly enters the continuous rolling mill set to complete rolling of the intermediate billet after the heat supplementing operation is completed;
continuous rolling: introducing the intermediate billet subjected to temperature compensation in the step (iv) into a rolling mill of a continuous rolling unit to carry out continuous rolling to obtain a primary rolled piece, wherein the continuous rolling unit comprises the working procedures of rough rolling, intermediate rolling and pre-finish rolling, the inlet temperature of the rough rolling is controlled at 1040 ℃, the speed is controlled at 2m/s, the number of passes of the rough rolling is 6, the inlet temperature of the intermediate rolling is controlled at 990 ℃, the speed is controlled at 2.0/s, the number of passes of the intermediate rolling is 6, the inlet temperature of the pre-finish rolling is controlled at 950 ℃, the speed is controlled at 3m/s, and the number of passes of the pre-finish rolling is 4; the intermediate billet is deformed and permeated into the core part of the casting blank by applying large pass deformation, so that the defects of core segregation, looseness and the like are reduced, and the compression deformation of the continuous rolling unit is used for matching the continuous casting tapping speed and the continuous rolling steel feeding speed, so that the intermediate billet meets the rolling condition of the continuous rolling unit, and the continuous casting and rolling production is realized;
sixthly, fine rolling and reducing: cutting off the head of the primary rolled piece after the continuous rolling in the fifth step by flying shears, then entering a reducing and sizing machine set for finish rolling and reducing to obtain a rod and wire product with the target specification, wherein the inlet temperature of the finish rolling and reducing is controlled at 830 ℃, the speed is controlled at 8m/s, and the pass of the reducing and sizing machine set is 2 times;
and (c) cooling: and cooling the rod and wire products with the target specification by water mist, then feeding the rod and wire products with the target specification to a cooling bed, reducing the surface temperature of the rod and wire products with the target specification to below 360 ℃, collecting, cutting to length, collecting and bundling.
Example 3
The endless continuous casting and rolling production process of the rod and wire product in the embodiment 3 comprises the following steps:
firstly, continuous casting, namely, firstly, injecting refined molten steel into a tundish, leading the superheat degree of the molten steel in the tundish to be 40 ℃, optimizing the temperature of the molten steel in the tundish and reducing the temperature of the molten steel in the tundishThe method comprises the steps of reducing the casting cost caused by overhigh molten steel temperature in a tundish and reducing the molten steel fluidity in the tundish, avoiding the situation that the molten steel fluidity is reduced and broken casting occurs because the molten steel temperature in the tundish is overhigh, then injecting the molten steel in the tundish into a crystallizer for cooling, covering the surface of the molten steel in the crystallizer with protective slag for protecting the molten steel, wherein the thickness of the protective slag is 10mm, cooling and crystallizing the molten steel along the inner wall of the crystallizer to form a solidified blank taking the molten steel as a liquid core, finally drawing the solidified blank out of an outlet of the crystallizer by using a withdrawal and straightening machine to obtain a continuous casting blank, and the cooling water flow in the crystallizer is 140m3The pulling speed of the withdrawal and straightening machine is 8.5m/min, the temperature of a continuous casting billet in the withdrawal and straightening machine is controlled to be 1250 ℃, the cooling water flow and the pulling speed of a crystallizer are optimized, the pressing and elimination of internal defects of the continuous casting billet are facilitated, the improvement of the internal quality of the casting billet is promoted, and the stability of continuous casting production of the continuous casting billet is improved;
further, in the step I, the molten steel covering slag comprises, by mass, 50% of calcium oxide, 30% of silicon dioxide, 2% of aluminum oxide, 1% of magnesium oxide, 8% of sodium oxide, 4% of calcium fluoride, 1% of carbon, 3.5% of single-layer graphene, and R20.5 percent of O alkali metal oxide, adding the covering slag into the crystallizer, wherein the covering slag covers the liquid level of the molten steel in the crystallizer, meanwhile, when the molten steel is cooled and crystallized in the crystallizer to form a primary finished product, part of the covering slag also flows into a gap formed between the primary finished product and the crystallizer, so that good lubricating and heat transfer effects are achieved, uniform growth of a primary solidified blank shell is promoted, the continuous casting production stability of a continuous casting blank is improved, and the quality and the qualification rate of the continuous casting blank are improved;
further, in the step I, three-stage water distribution is arranged between the crystallizer and the withdrawal and straightening machine to control the temperature of the continuous casting billet in the withdrawal and straightening machine, the three-stage water distribution is arranged to improve the cooling strength of the continuous casting billet at a specific withdrawal speed and simultaneously ensure that the surface of the continuous casting billet can be uniformly cooled horizontally and longitudinally, the three-stage water distribution sequentially comprises foot roll water, first area water and second area water, and the water flow of the foot roll is 8.5m3H, water flow of the first zone is 12 m3H, the water flow of the second zone is 10.0 m3H, the three-stage water distribution and the specific flow control can further improve the surface cross of the continuous casting billetThe temperature can be uniformly reduced towards and along the longitudinal direction, the quality of the continuous casting billet is improved, and the improvement of the internal quality of the casting billet after the casting billet enters the primary rolling process is further promoted;
second, initial rolling: sending the continuous casting billet prepared in the first step into a blooming mill group for blooming to obtain an intermediate billet, wherein the blooming mill group adopts a rolling mill system used in the prior art, 5 or 7 passes of rolling are preferably adopted for rolling the intermediate billet, the width of the intermediate billet is controlled to be 120cm, the thickness of the intermediate billet is 20cm, the temperature of an inlet of blooming is controlled to be 1100 ℃, the speed is controlled to be 3.0m/s, the intermediate billet is sprayed with water for cooling after exiting from the blooming mill group, the surface temperature is controlled to be 980 ℃, the blooming mill group is arranged behind a withdrawal and straightening machine, the distance from the inlet of the withdrawal and straightening machine to the inlet of the blooming mill after a continuous casting machine is preferably 30m, the temperature drop of the continuous casting billet is reduced, the inlet temperature of the continuous casting billet entering the blooming mill group can be increased, the motor load of the blooming mill group is reduced, the failure rate in the production process is reduced, the yield is increased, the energy consumption is reduced, and the yield is increased;
the butt joint of the intermediate billet is that the forward intermediate billet after the rough rolling and the subsequent intermediate billet next to the forward intermediate billet are output by a conveying roller 1, the head of the forward intermediate billet and the head of the subsequent intermediate billet are positioned and centered by a positioning mechanism in the process of conveying the forward intermediate billet and the subsequent intermediate billet by the conveying roller 1, then the tail of the forward intermediate billet is cut by a front shearing machine 2 to form a first notch, the head of the subsequent intermediate billet is cut by a rear shearing machine 3 to form a second notch, then the butt joint gap of the first notch and the second notch is controlled to be not more than 2mm, a welding groove 6 is formed between the first notch and the second notch, then a metal welding wire is conveyed to the welding groove 6 by a laser ray emitted by a laser ray welding device 5 by a welding wire conveyor 4 to carry out laser ray oscillation welding, and the metal welding wire with stable austenite performance is conveyed to a molten pool generated by the laser ray, welding the forward intermediate blank and the subsequent intermediate blank is realized, the oscillation direction of the laser ray is vertical to the welding direction, the oscillation frequency of the laser ray is at least 500HZ, and the oscillation amplitude of the laser ray is 1.5 mm; the laser ray is oscillated transversely to the welding direction, so that the welding seam is further uniform, the welding quality is improved, and the connection strength of the forward intermediate blank and the subsequent intermediate blank can be improved through the oscillation of the laser ray; the amplitude of the laser beam oscillation, which in this order of magnitude allows high welding speeds and therefore high productivity of the welding method, to be achieved, can be achieved by means of a compact-design laser beam directing device, preferably by means of a rotating or oscillating deflecting mirror;
further, in the third step, the metal welding wire consists of the following components in percentage by mass: the metal welding wire comprises the following components in percentage by mass: 90% of iron, 2% of aluminium, 0.2% of carbon, 1% of silicon, 0.5% of manganese, 2% of chromium, 2.1% of molybdenum, 2% of nickel and 0.2% of cerium, with which the use of the method according to the invention in a very reliable manner in the application of butted intermediate blanks makes it possible to ensure the complete transformation of the weld into a martensitic structure, increasing the joining strength;
furthermore, in the third step, the metal welding wire needs to be preheated to 80 ℃ before being delivered to the molten pool, so that higher process speed or higher production rate can be realized;
fourthly, temperature compensation of the intermediate blank: detecting the temperature of the intermediate billet after the butt joint in the step three, if the temperature meets the requirement of the inlet temperature of the continuous rolling unit, not performing temperature compensation, if the temperature is insufficient, performing temperature compensation on the continuous casting billet by using an automatic heating device, and performing head cutting before the intermediate billet enters the continuous rolling unit;
further, in the fourth step, the automatic heating device includes a first gate frame 7 and a second gate frame 8 which are arranged between the conveying rollers 1, the first gate frame 7 is provided with an infrared thermometer 9, the infrared thermometer 9 is a conventional art, an upper lifting mechanism 10 is arranged between the first gate frame 7 and the second gate frame 8 above the conveying rollers 1, an upper supporting frame body 11 is arranged below the upper lifting mechanism 10, a plurality of upper electromagnetic induction heating plates 12 are arranged on the upper supporting frame body 11 at equal intervals, a lower lifting mechanism 13 is arranged between the first gate frame 7 and the second gate frame 8 below the conveying rollers 1, a lower supporting frame body 14 is arranged below the lower lifting mechanism 13, a plurality of lower electromagnetic induction heating plates 15 are arranged on the lower supporting frame body 14 at equal intervals, a controller 16 is arranged outside the conveying rollers 1, and the infrared thermometer 9, The upper side lifting mechanism 10, the upper side electromagnetic induction heating plate 12, the lower side lifting mechanism 13 and the lower side electromagnetic induction heating plate 15 are electrically connected with the controller 16, the upper side electromagnetic induction heating plate 12 and the lower side electromagnetic induction heating plate 15 have the same structure and respectively comprise a heating plate body 17 and an electromagnetic induction coil, the electromagnetic induction coil comprises a first joint part 18, a second joint part 19 and a heating part 20 arranged between the first joint part 18 and the second joint part 19, the heating part 20 is arranged in a serpentine structure, the heating plate body 17 is provided with an installation groove for installing the electromagnetic induction coil, during installation, the electromagnetic induction coil 12 of the upper side electromagnetic induction heating plate is installed on the lower surface of the heating plate body 17, the electromagnetic induction coil of the lower side electromagnetic induction heating plate 15 is installed on the upper surface of the heating plate body 17, and the electromagnetic induction coil is arranged in the installation groove of the heating plate body 17, the problem that adjacent coils are easy to be short-circuited is avoided, and the utilization rate of the alternating magnetic field is improved, so that the heating efficiency is improved;
the method for supplementing the temperature of the intermediate billet by the automatic heating device comprises the following steps: respectively inputting data such as the inlet rolling temperature of the continuous rolling of the intermediate billet, the section size of the intermediate billet, the conveying speed of the intermediate billet and the like on an operation interface of a controller 16, then conveying the intermediate billet to the direction of the continuous rolling mill by using conveying rollers 1, acquiring real-time temperature data of the intermediate billet by using an infrared thermometer 9 when the intermediate billet passes below the infrared thermometer 9, transmitting the temperature data to a control system of the controller 16, comparing the real-time temperature data of the intermediate billet with target rolling temperature data by using the controller, sending a control instruction to an upper electromagnetic induction heating plate 12 and a lower electromagnetic induction heating plate 15 by using the controller when the real-time temperature of the intermediate billet is lower than the target rolling temperature, automatically calculating the heat compensation amount required by the intermediate billet by using the controller, and after receiving the control instruction by the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15, the controller 16 controls the upper lifting mechanism 10 to drive the upper electromagnetic induction heating plate 12 to move downwards, controls the lower lifting mechanism 13 to drive the lower electromagnetic induction heating plate 15 to move upwards, controls the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15 to be electrified to supplement the temperature of the intermediate billet, controls the upper electromagnetic induction heating plate 12 and the lower electromagnetic induction heating plate 15 to stop being electrified after the temperature supplementing operation is completed, and directly enters the continuous rolling mill set to complete rolling of the intermediate billet after the heat supplementing operation is completed;
continuous rolling: introducing the intermediate billet subjected to temperature compensation in the step (iv) into a rolling mill of a continuous rolling unit to carry out continuous rolling to obtain a primary rolled piece, wherein the continuous rolling unit comprises the working procedures of rough rolling, intermediate rolling and pre-finish rolling, the inlet temperature of the rough rolling is controlled at 1050 ℃, the speed is controlled at 2.5m/s, the number of passes of the rough rolling is 7, the inlet temperature of the intermediate rolling is controlled at 1000 ℃, the speed is controlled at 2.5/s, the number of passes of the intermediate rolling is 7, the inlet temperature of the pre-finish rolling is controlled at 960 ℃, the speed is controlled at 3.5m/s, and the number of passes of the pre-finish rolling is 5; the intermediate billet is deformed and permeated into the core part of the casting blank by applying large pass deformation, so that the defects of core segregation, looseness and the like are reduced, and the compression deformation of the continuous rolling unit is used for matching the continuous casting tapping speed and the continuous rolling steel feeding speed, so that the intermediate billet meets the rolling condition of the continuous rolling unit, and the continuous casting and rolling production is realized;
sixthly, fine rolling and reducing: cutting off the head of the primary rolled piece after the continuous rolling in the fifth step by flying shears, then entering a reducing sizing mill set for finish rolling and reducing to obtain a rod and wire product with target specification, wherein the inlet temperature of finish rolling and reducing is controlled at 850 ℃, the speed is controlled at 10m/s, and the pass of the reducing sizing mill set is 3 times;
and (c) cooling: and cooling the rod and wire products with the target specification by water mist, then feeding the rod and wire products with the target specification to a cooling bed, reducing the surface temperature of the rod and wire products with the target specification to below 360 ℃, collecting, cutting to length, collecting and bundling.
The rod products prepared by the method in the embodiments 1-3 have high product qualification rate and high production efficiency, and compared with the traditional endless continuous casting process, the product qualification rate is over 99.5%, and the production efficiency is improved by 10-15%. The embodiment result shows that the rolling method can not only realize that the continuous casting billet is directly fed into a rolling mill for rolling after being pulled out from a crystallizer, heating, heat supplementing and post-treatment processes are omitted, and the direct feeding and direct rolling technology of the continuous casting billet is realized, but also improve the speed of butt welding and the connection strength of the butt welding by adopting the advanced laser butt welding technology, and also realize temperature control and heat supplementing of the intermediate billet by adopting an advanced electromagnetic induction type heating device, so that the energy consumption is low, the investment and construction cost of a heating furnace is saved, the automation degree of temperature control heating is high, and the method can provide a new way for reducing emission, improving efficiency, optimizing cost and improving the quality and efficiency of products.

Claims (8)

1.一种棒线材产品无头连铸连轧生产工艺,其特征在于,包括以下步骤:1. A production technique for endless continuous casting and rolling of rod and wire products, characterized in that, comprising the following steps: ①连铸: 先将精炼后的钢水注入中间包，使中间包内钢水的过热度为30～40℃，然后将中间包内的钢水注入结晶器中进行冷却，结晶器中的钢水表面覆盖有用于保护钢水的保护渣，保护渣的厚度为5～10mm，钢水沿结晶器内壁冷却结晶形成以钢水为液芯的凝固坯，最后将凝固坯利用拉矫机从结晶器的出口拉出得到连铸坯，结晶器内冷却水流量为130～140m3/h,拉矫机的拉速为6.8～8.5m/min，控制拉矫机中的连铸坯的温度为1150～1250℃；①Continuous casting: First, pour the refined molten steel into the tundish, so that the superheat of the molten steel in the tundish is 30-40 °C, and then pour the molten steel in the tundish into the mold for cooling, and the molten steel surface in the mold is effectively covered. For the mold slag protecting molten steel, the thickness of the mold slag is 5-10mm. The molten steel is cooled and crystallized along the inner wall of the mold to form a solidified billet with molten steel as the liquid core. For the casting billet, the cooling water flow in the mold is 130-140 m 3 /h, the pulling speed of the tension leveler is 6.8-8.5 m/min, and the temperature of the continuous casting billet in the tension leveler is controlled to be 1150-1250°C; ②初轧：将步骤①制得的连铸坯送入初轧机组进行初轧得到中间坯,中间坯的宽度控制在80～120cm，厚度为10～20cm，初轧的入口温度控制在1050～1100℃,速度控制在2.0～3.0m/s，中间坯出粗轧机组之后进行喷水冷却，表面温度控制为950～980℃；②Brush rolling: The continuous casting billet obtained in step ① is sent to the blooming unit for blooming to obtain an intermediate billet. The width of the intermediate billet is controlled at 80-120cm, the thickness is 10-20cm, and the inlet temperature of the blooming is controlled at 1050～120cm. 1100℃, the speed is controlled at 2.0～3.0m/s, the intermediate billet is cooled by water spray after the rough rolling mill, and the surface temperature is controlled at 950～980℃; ③中间坯的对接连接:把经过步骤②粗轧后的前行中间坯和紧接着该前行中间坯的后续中间坯由输送辊（1）输出，输送的过程中,先利用定位机构将前行中间坯的尾部和后续中间坯的头部定位及对中后,再利用前剪切机（2）对前行中间坯的尾部剪切形成第一缺口,利用后剪切机（3）对后行中间坯的头部进行剪切形成第二缺口,接着控制第一缺口和第二缺口的对接间隙不大于2mm，让第一缺口和第二缺口之间形成焊接坡口（6），之后再利用焊丝输送机（4）将金属焊丝输送到由激光射线焊接装置（5）发射的激光射线对焊接坡口（6）进行激光射线振荡焊接，激光射线的振荡方向与焊接方向垂直，激光射线的振荡频率至少为400～500HZ，激光射线的振荡幅度为1～1.5mm；③The butt connection of the intermediate billet: The leading intermediate billet after rough rolling in step ② and the subsequent intermediate billet following the leading intermediate billet are output from the conveying roller (1). After the tail of the intermediate blank in the row and the head of the subsequent intermediate blank are positioned and centered, the front shearing machine (2) is used to cut the tail of the intermediate blank in the preceding row to form a first gap, and the rear shearing machine (3) is used to cut the first gap. The head of the intermediate blank in the rear row is cut to form a second gap, and then the butt gap between the first gap and the second gap is controlled to be no greater than 2mm, so that a welding groove (6) is formed between the first gap and the second gap. Then, the welding wire conveyor (4) is used to transport the metal welding wire to the laser beam emitted by the laser beam welding device (5) to perform laser beam oscillation welding on the welding groove (6). The oscillation direction of the laser beam is perpendicular to the welding direction. The oscillation frequency of the laser beam is at least 400~500HZ, and the oscillation amplitude of the laser ray is 1~1.5mm; ④中间坯的补温：对步骤③对接后的中间坯进行温度检测，若温度达到连轧机组入口温度要求，则不进行补温，若温度不足，则需利用自动加热装置对连铸坯进行补温，中间坯进入连轧机组前需进行切头；④ Warming up of the intermediate billet: Check the temperature of the intermediate billet after docking in step ③. If the temperature reaches the inlet temperature requirement of the continuous rolling mill, no warm-up will be performed. If the temperature is insufficient, the continuous casting billet needs to be heated by an automatic heating device. Make up the temperature, the intermediate billet needs to be cut before entering the continuous rolling line; ⑤连轧：将经步骤④补温后的中间坯引入连轧机组轧机内进行连轧得到一次轧件，连轧机组包括粗轧、中轧和预精轧工序，粗轧的入口温度控制在1020～1050℃、速度控制在1.5～2.5m/s，粗轧的道次为5～7次；中轧的入口温度控制在980～1000℃、速度控制在1.5～2.5/s，中轧的道次为5～7次；预精轧的入口温度控制在940～960℃、速度控制在2.5～3.5m/s，预精轧的道次为3～5次；⑤Continuous rolling: introduce the intermediate billet after step ④ into the rolling mill of the continuous rolling unit for continuous rolling to obtain a rolling piece. The continuous rolling unit includes rough rolling, intermediate rolling and pre-finishing rolling. The inlet temperature of rough rolling is controlled at 1020～1050℃, the speed is controlled at 1.5～2.5m/s, the number of passes of rough rolling is 5～7 times; the inlet temperature of middle rolling is controlled at 980～1000℃, the speed is controlled at 1.5～2.5/s, The number of passes is 5 to 7 times; the inlet temperature of the pre-finishing rolling is controlled at 940-960 °C, the speed is controlled at 2.5-3.5m/s, and the number of passes of the pre-finishing rolling is 3 to 5 times; ⑥精轧减径：将经步骤⑤连轧后的一次轧件通过飞剪切除头部，然后进入减定径机组进行精轧减径得到目标规格棒线材产品，精轧减径的入口温度控制在800～850℃、速度控制在5～10m/s，减定径机组的道次为2～3次；⑥ Finishing rolling and diameter reduction: remove the head of the primary rolling piece after continuous rolling in step ⑤, and then enter the reducing and sizing unit for finishing rolling and reducing the diameter to obtain the target specification bar and wire products. The inlet temperature of finishing rolling and reducing Controlled at 800～850℃, speed controlled at 5～10m/s, the number of passes of the reducing and sizing unit is 2～3 times; ⑦冷却：将经步骤⑥得到的目标规格棒线材产品经水雾冷却后上冷床，将目标规格棒线材产品表面温度降低至为360℃以下收集后进行定尺剪切、收集、打捆。⑦Cooling: The target specification rod and wire product obtained in step ⑥ is cooled by water mist and then placed on a cooling bed, and the surface temperature of the target specification rod and wire rod product is reduced to below 360 ℃, and then collected, cut to length, collected and bundled. 2.根据权利要求1所述的一种棒线材产品无头连铸连轧生产工艺,其特征在于：在步骤①中，钢水保护渣以质量百分比计包括以下组成，氧化钙30～50%、二氧化硅20～40% 、三氧化二铝2～6% 、氧化镁1～5%、氧化钠5～10%、氟化钙2～5%、碳0.5～2%、单层石墨烯1～5%、R2O碱金属氧化物0.5～1%。2. a kind of bar and wire product endless continuous casting and rolling production process according to claim 1, is characterized in that: in step 1., molten steel slag comprises the following composition in mass percentage, calcium oxide 30～50%, Silica 20～40%, Al2O3 2～6%, Magnesium Oxide 1～5%, Sodium Oxide 5～10%, Calcium Fluoride 2～5%, Carbon 0.5～2%, Monolayer Graphene 1 ～5%, R 2 O alkali metal oxide 0.5～1%. 3.根据权利要求1所述的一种棒线材产品无头连铸连轧生产工艺,其特征在于：在步骤①中，结晶器与拉矫机之间设置三段配水控制拉矫机中的连铸坯的温度，三段配水依次包括足辊水、一区水和二区水，所述足辊水流量为7～8.5m3/h，一区水流量为11.5～12 m3/h，二区水流量为9.0～10.0 m3/h。3. a kind of bar and wire product endless continuous casting and rolling production process according to claim 1, is characterized in that: in step 1., between the crystallizer and the tension leveler, three stages of water distribution control are arranged in the tension leveler. For the temperature of the continuous casting billet, the three - stage water distribution includes the foot roll water, the first zone water and the second zone water in sequence. , the water flow in the second zone is 9.0-10.0 m 3 /h. 4.根据权利要求1所述的一种棒线材产品无头连铸连轧生产工艺,其特征在于：在步骤③中，金属焊丝由以下质量百分含量的组分组成：铁70～90%、铝2～10%、碳0.2～1%、硅1～4%、锰0.5～2%、铬1～2%、钼2～5%、镍2～5%和0.2～1%铈。4. A kind of rod and wire product endless continuous casting and rolling production process according to claim 1, is characterized in that: in step ③, the metal welding wire is made up of the following components by mass percentage: iron 70～90% , 2 to 10% of aluminum, 0.2 to 1% of carbon, 1 to 4% of silicon, 0.5 to 2% of manganese, 1 to 2% of chromium, 2 to 5% of molybdenum, 2 to 5% of nickel and 0.2 to 1% of cerium. 5.根据权利要求1所述的一种棒线材产品无头连铸连轧生产工艺,其特征在于：在步骤③中，金属焊丝在输送到熔池之前需要预热至70～80℃。5 . The production process of endless continuous casting and rolling for rod and wire products according to claim 1 , wherein in step ③, the metal welding wire needs to be preheated to 70-80° C. before being transported to the molten pool. 6 . 6.根据权利要求1所述的一种棒线材产品无头连铸连轧生产工艺,其特征在于：在步骤④中，所述自动加热装置包括架设在输送辊（1）之间的第一门型架（7）和第二门型架（8），所述第一门型架（7）上安装有红外测温仪（9），在输送辊1上方的第一门型架（7）和第二门型架（8）之间安装有上侧升降机构（10），上侧升降机构（10）的下方安装有上支撑框体（11），上支撑框体（11）上等间距的安装有多块上侧电磁感应加热板（12），在输送辊（1）下方的第一门型架（7）和第二门型架（8）之间安装有下侧升降机构（13），下侧升降机构（13）的下方安装有下支撑框体（14），下支撑框体（14）上等间距的安装有多块下侧电磁感应加热板（15），在输送辊（1）的外侧安装有控制器（16），所述红外测温仪（9）、上侧升降机构（10）、上侧电磁感应加热板（12）、下侧升降机构（13）、下侧电磁感应加热板（15）均与控制器（16）电连接。6. The production process of endless continuous casting and rolling of rod and wire products according to claim 1, characterized in that: in step ④, the automatic heating device comprises a first A gantry (7) and a second gantry (8), an infrared thermometer (9) is installed on the first gantry (7), and the first gantry (7) above the conveying roller 1 ) and the second portal frame (8), an upper lifting mechanism (10) is installed, and an upper supporting frame (11) is installed below the upper lifting mechanism (10), and the upper supporting frame (11) is superior. There are a plurality of upper electromagnetic induction heating plates (12) installed in the spacing, and a lower side lifting mechanism ( 13), a lower support frame body (14) is installed below the lower side lifting mechanism (13), and a plurality of lower side electromagnetic induction heating plates (15) are installed at equal intervals on the lower support frame body (14). A controller (16) is installed on the outside of (1), the infrared thermometer (9), the upper lifting mechanism (10), the upper electromagnetic induction heating plate (12), the lower lifting mechanism (13), the lower The side electromagnetic induction heating plates (15) are all electrically connected with the controller (16). 7.根据权利要求6所述的一种棒线材产品无头连铸连轧生产工艺,其特征在于：所述上侧电磁感应加热板（12）、下侧电磁感应加热板（15）的结构相同，均包括加热板本体（17）和电磁感应线圈，电磁感应线圈包括第一接头部（18）、第二接头部（19）以及安装在第一接头部（18）和第二接头部（19）之间的加热部（20），所述加热部（20）呈蛇形结构布置，所述加热板本体（17）上设置有安装有电磁感应线圈的安装在安装槽。7. The production process of endless continuous casting and rolling of bar and wire products according to claim 6, characterized in that: the structure of the upper electromagnetic induction heating plate (12) and the lower electromagnetic induction heating plate (15) are the same, including a heating plate body (17) and an electromagnetic induction coil. The electromagnetic induction coil includes a first joint part (18), a second joint part (19), and is installed on the first joint part (18) and the second joint part ( 19) between the heating parts (20), the heating parts (20) are arranged in a serpentine structure, and the heating plate body (17) is provided with an installation slot on which an electromagnetic induction coil is installed. 8.根据权利要求6所述的一种棒线材产品无头连铸连轧生产工艺,其特征在于：自动加热装置对中间坯的补温方法为：在控制器（16）的操作界面上分别输入中间坯连轧的入口轧制温度、中间坯的截面尺寸及中间坯的输送速度等数据，之后中间坯有输送辊（1）向连轧机方向输送，当中间坯从红外测温仪（9）下方经过时，由红外测温仪（9）采集中间坯的实时温度数据，并将该温度数据传输至控制器（16）的控制系统中，控制器将中间坯的实时温度数据与目标轧制温度数据进行对比，当中间坯的实时温度低于目标轧制温度时，控制器（16）向上侧电磁感应加热板（12）、下侧电磁感应加热板（15）发出控制指令，同时由控制器自动计算出中间坯所需的补热量，上侧电磁感应加热板（12）、下侧电磁感应加热板（15）接收到控制指令后，控制器（16）控制上侧升降机构（10）带动上侧电磁感应加热板（12）下移，控制下侧升降机构（13）带动下侧电磁感应加热板（15）上移，同时控制上侧电磁感应加热板（12）、下侧电磁感应加热板（15）通电对中间坯进行补温，补温作业完成后，控制上侧电磁感应加热板（12）、下侧电磁感应加热板（15）停止通电，经补热后的中间坯直接进入连轧机组完成轧制。8 . The production process of endless continuous casting and rolling of rod and wire products according to claim 6 , characterized in that: the method for supplementing the temperature of the intermediate billet by the automatic heating device is: on the operation interface of the controller (16), respectively Input the data such as the entry rolling temperature of the continuous rolling of the intermediate billet, the section size of the intermediate billet and the conveying speed of the intermediate billet. ), the infrared thermometer (9) collects the real-time temperature data of the intermediate billet, and transmits the temperature data to the control system of the controller (16), and the controller compares the real-time temperature data of the intermediate billet with the target rolling When the real-time temperature of the intermediate billet is lower than the target rolling temperature, the controller (16) sends out control commands to the upper electromagnetic induction heating plate (12) and the lower electromagnetic induction heating plate (15), and simultaneously The controller automatically calculates the supplementary heat required for the intermediate blank. After the upper electromagnetic induction heating plate (12) and the lower electromagnetic induction heating plate (15) receive the control commands, the controller (16) controls the upper lifting mechanism (10). ) drives the upper electromagnetic induction heating plate (12) to move down, controls the lower lifting mechanism (13) to drive the lower electromagnetic induction heating plate (15) to move up, and controls the upper electromagnetic induction heating plate (12), the lower electric The magnetic induction heating plate (15) is energized to supplement the temperature of the intermediate blank. After the heating operation is completed, the upper electromagnetic induction heating plate (12) and the lower electromagnetic induction heating plate (15) are controlled to stop energizing. Directly enter the continuous rolling mill to complete the rolling.
CN202111485659.7A 2021-12-07 2021-12-07 Endless continuous casting and rolling production process for bar and wire products Pending CN114192574A (en)

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