CN109433825B - Method for producing high-strength steel plate in a short process, high-strength steel plate and application thereof - Google Patents
Method for producing high-strength steel plate in a short process, high-strength steel plate and application thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
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Abstract
本发明公开一种短流程制作高强度钢板的方法以及高强度钢板及其应用，属于冶金轧制及深加工领域。本发明所述方法在薄板坯连铸连轧处理过程中，获得精轧机组精轧处理后的薄板坯，然后直接剪切成预设尺寸，经感应加热满足热冲压目标温度后进行热冲压加工处理，制成高强度钢板。实现从原料到产品一体化生产，节省了中间环节的运输成本，可以达到节能降耗、绿色生产的目的，显著缩短板材深加工整体制造流程，具有超短流程、深度加工、多品种小批量大规模定制生产的优点。
The invention discloses a method for producing a high-strength steel plate in a short process, a high-strength steel plate and an application thereof, and belongs to the field of metallurgical rolling and deep processing. In the method of the invention, in the process of continuous casting and rolling of thin slabs, the thin slabs after finishing rolling by the finishing rolling unit are obtained, and then they are directly cut into preset sizes, and hot stamping is carried out after induction heating meets the target temperature of hot stamping. processed to produce high-strength steel. It realizes the integrated production from raw materials to products, saves the transportation cost of intermediate links, can achieve the purpose of energy saving, consumption reduction and green production, and significantly shorten the overall manufacturing process of sheet metal deep processing. Advantages of custom production.
Description
Technical Field
The invention belongs to the field of metallurgical rolling and deep processing, and particularly relates to a method for manufacturing a high-strength steel plate in a short process, the high-strength steel plate and application of the high-strength steel plate.
Background
The steel industry is a main carrier for bearing national industrial responsibility, and in a new period of development of the steel industry in China, a plurality of challenges of structural reform on the supply side, ecological environment protection, high-quality development, increasingly strict personalized customization, increasingly strict service requirements and the like are faced at present. The steel enterprises accelerate the structure adjustment around aspects of flow-type intelligent manufacturing, large-scale personalized customization and the like, introduce the most advanced equipment technology by taking market and innovation as means, continuously promote the product upgrade and technological innovation, and realize transformation development, international development and high-quality development. Therefore, the technology upgrading of the thin slab continuous casting and rolling (TSCR) is promoted, and the TSCR technology is known as the third technical revolution in the development of the international iron and steel industry. The TSCR technology is rapidly developed and widely applied in the steel industry of all countries, and has important influence on the technical structure adjustment and the organizational structure adjustment of the steel industry of all countries, and the most representative process equipment in the TSCR production lines of all countries of the world is as follows: the CSP technology developed by German SMS, the ISP technology developed by German SMS and Arvedi Italy, the FTSR and MCCR technologies developed by Danieli Italy, the ESP technology developed by SIEMENS in Germany and Arvedi Italy, and other TSCR production lines include QSP technology of Japanese Sumitomo and ASP technology of saddle steel in China. The thin slab continuous casting and rolling technology is an important link of plate production and directly influences the quality and comprehensive mechanical properties of products. The rolled plate has the advantages of thin general specification, high strength and high hardness, can replace partial cold rolling products, and realizes 'hot strip cooling' and 'thin strip thickness'.
The process flow of the present thin slab continuous casting and rolling for producing high strength steel is as shown in article Zhengxu, Nissan steel ESP endless rolling technology [ J ] metallurgy equipment, 2016(1) (shown in figure 1), continuous casting → roughing mill group → pendulum shear → induction heating → descaling box → finishing mill group → laminar cooling → flying shear → curling, rolling the plate with waste heat into a coil by a curling machine, and delivering to a hot stamping deep processing enterprise for post-forming treatment after leaving the factory.
In the existing hot stamping deep processing enterprises, in the process flow of carrying out hot stamping on high-strength automobile plates, such as DEMERI MY, advanced high-strength steel [ M ]. ASM International, 2013, 127-. High-strength steel with the original tensile strength of about 450MPa is formed into a high-strength formed part through a stamping and quenching die, and the formed ultrahigh-strength steel part is transported to downstream enterprises such as vehicle manufacturing and the like.
Because the steel raw materials are subjected to multiple processing, a large amount of resources and energy are consumed from the preparation of initial raw materials to final finished products, an upstream steel enterprise can generate a large amount of residual energy resources such as residual heat and residual pressure in the plate rolling process, energy waste can be caused when cooling is carried out, and downstream steel needs to be heated in advance during processing, so that a large amount of energy is consumed again.
The process reconstruction is a high-technology strategic coordination mechanism which is always strived by the German government to establish departments to promote the research and innovation work of Germany, and the 'industry 4.0' is a strategic plan which is officially promoted by the German Federal education and research department and is adopted by the German government as a part of the action plan of the high-technology strategy 2020 at present, so that the purpose of ensuring the strong competitive position of the German industry in the whole world through technical innovation is achieved.
The process reconstruction is a fundamental thinking and thorough reconstruction of business processes of enterprises, and aims to achieve remarkable improvement in the aspects of cost, quality, service, speed and the like, so that the enterprises can adapt to the modern enterprise operating environment characterized by ' Customer ', Competition and Change ', and the process reconstruction attracts the general attention and research of scholars.
The publication No. CN104762460A, entitled "rolling and deep processing short-flow integrated manufacturing method of high-strength steel automobile sheet", proposes raw material → heating furnace → controlled rolling (rough rolling and finish rolling) → laminar cooling → comprehensive blanking → heating → forming quenching → cutting, shot blasting → finished product, and realizes the rigid connection manufacturing of the traditional single-blank hot rolling line and the forming. The patent publication No. CN105414177A entitled "short-flow production and processing technology and equipment for cold-rolled ultrahigh-strength steel" proposes that the hot-rolled strip steel from the incoming material is processed by the procedures of pickling and the like before rolling, then is cold-rolled, and is subjected to heat treatment and deformation phase change comprehensive treatment, the plate is subjected to heat treatment and deformation phase change comprehensive treatment, then enters a loop, is subjected to hot stamping deep processing technology after the loop quantity is adjusted to adapt to the change of rolling speed and stamping speed, and is sheared to a fixed size, and the finished product or semi-finished product of the stamping part is obtained after the ultrahigh-strength steel is finished.
The process reconstruction realizes the combined recombination of an upstream rolling enterprise and a downstream deep processing enterprise, but the process reconstruction is applied to a traditional hot rolling line or a cold rolling line, generally belongs to different enterprises or different workshops, produces products with different thickness specifications, is limited by the yield of a rolling mill, can not realize endless rolling production in upstream rolling, and is divided into a strong force area, a conventional area and a fine adjustment area in a hot rolling laminar cooling stage, uncontrollable random disturbance variable factors including the quantity of cooling water, the water pressure and the flow state of water flow, and the speed, the thickness and the like have strong time-varying property, so that the control precision is improved, cooling water on the surface of a plate is required to be removed in the subsequent hot stamping deep processing process, and the forming performance and the surface quality of a subsequent hot stamping material are not influenced.
Moreover, at present, high-performance ultrathin hot rolled strip steel can be produced by thin slab continuous casting and rolling, and a thin product can replace a cold rolling line by reconstructing with an advanced hot stamping deep processing technical process, so that the purposes of 'cooling with hot strip' and 'thickening with thin strip' are realized, and therefore, a new technology is urgently needed to be developed, the combination recombination of a headless rolling technology and hot stamping deep processing can be realized, and the full-continuous customized production can be realized.
Disclosure of Invention
In order to solve the technical problems, the invention requests to protect a method for manufacturing a high-strength steel plate by a short process, the high-strength steel plate and application thereof, and aims to lead the process to be in the industrialized development direction of the short process and the near net shape, change the traditional independent production process of upstream and downstream enterprises, and carry out process reconstruction on the continuous casting and rolling of thin slabs and the subsequent hot stamping deep processing.
In order to solve the problems, the technical scheme is as follows: a method for manufacturing a high-strength steel plate in a short process is characterized in that in the process of sheet billet continuous casting and rolling, a sheet billet subjected to finish rolling treatment by a finishing mill set is obtained, then the sheet billet is directly sheared into a preset size, and after induction heating is carried out to meet the target temperature of hot stamping, hot stamping processing is carried out to manufacture the high-strength steel plate.
The further technical scheme is that the method comprises the steps of thin slab continuous casting and rolling treatment and hot stamping deep processing treatment; the thin slab continuous casting and rolling treatment comprises the following steps in sequence: continuous casting treatment, rough rolling treatment of a rough rolling unit, pendulum shear treatment, induction heating treatment, descaling box treatment and finish rolling treatment of a finishing rolling unit; the hot stamping deep processing treatment comprises the following steps according to the sequence of treatment: shearing treatment, induction heating treatment, heat preservation treatment, stamping quenching treatment, laser cutting treatment and shot blasting treatment.
The further technical scheme is that the thickness of the high-strength steel plate is 0.6-2.5 mm.
The further technical scheme is that in the thin slab continuous casting and rolling treatment, the temperature of the thin slab after continuous casting treatment is 1500 ℃, then after the thin slab is subjected to rough rolling treatment by a rough rolling unit, the temperature is reduced to 950 +/-20 ℃, the temperature is increased to 1150 +/-50 ℃ after induction heating treatment, and the temperature is reduced to 880 +/-30 ℃ after finish rolling treatment by a finishing rolling unit.
The further technical scheme is that the rough rolling mill group is a four-high mill, and the finishing rolling mill group is a four-high mill.
The further technical scheme is that the roughing mill group is a 3-frame roughing mill, and the finishing mill group is a 5-frame finishing mill.
The further technical scheme is that in the hot stamping deep processing process, the temperature of the hot stamping deep processing die after induction heating treatment is 880 +/-30 ℃, the temperature is kept for 180-250 s in the heat preservation treatment, in the stamping quenching treatment, the cooling speed of a stamping quenching die is set to be 55 +/-10 ℃/s, and the temperature is cooled to be 170 +/-50 ℃ after the treatment.
The further technical scheme is that a stamping quenching die is used in the stamping quenching treatment, and a cooling pipeline for quenching and cooling the plate is arranged in the stamping quenching die.
The further technical scheme is that the high-strength steel plate has a uniform martensite structure, and the tensile strength of the high-strength steel plate reaches 1550 MPa.
The further technical scheme is that the high-strength steel plate prepared by the method is characterized in that: the raw materials are as follows by mass percent: 0.225% of C, 1.24% of Mn, 0.03% of Al, 0.163% of Cr, 0.256% of Si, 0.003% of B, 0.013% of P, 0.003% of S and the balance of iron.
The further technical scheme is that the high-strength steel plate is applied to automobile production.
The invention achieves the following beneficial effects:
the invention is different from the existing continuous casting and rolling process of the sheet billet, in that the invention reconstructs the laminar cooling process and the subsequent rolling process and the hot stamping deep processing process flow, eliminates the laminar cooling and curling process, adds a shearing device behind a finishing mill set, shears the sheet into the size matched with a hot stamping deep processing die, and after the hot stamping deep processing, the sheet billet reaches the size requirement of the finished product through the laser cutting technology.
In the conventional laminar cooling of the continuous casting and rolling process of the sheet billet, the sheet billet is cooled at a low cooling speed, and is coiled into a coil by a coiler after the sheet billet forms a stable phase change structure and is cooled to a coiling temperature. The laminar cooling stage is divided into a strong force zone, a conventional zone and a fine adjustment zone, uncontrollable random disturbance variable factors including the amount of cooling water, water pressure, the flowing state of water flow, and strong time variability of speed, thickness and the like exist, in order to improve the control precision, the cooling water on the surface of the plate is also required to be removed in the subsequent hot stamping deep processing process so as to avoid influencing the forming performance and the surface quality of the subsequent hot stamping material, the invention reconstructs the thin slab continuous casting and rolling process and the hot stamping deep processing technical process, realizes the integrated production from raw materials to products, improves the surface quality and the performance of the products, reconstructs the hot stamping deep processing manufacturing technical process to the front of the thin slab continuous casting and rolling laminar cooling process based on the industrialized development direction of short process and near net shape, can save resources and shorten the length of a production line through the reconstruction, when the plate enters the hot stamping deep processing process through a finishing mill set, the strip steel has higher finish rolling temperature, and the thin slab continuous casting and rolling induction heating part can carry out proper temperature closed-loop control according to the finish rolling temperature, so that the initial heating time and energy consumption of deep processing can be saved. The method comprises the steps of setting the finish rolling temperature of a plate passing through a finishing mill group, enabling the plate to pass through the finishing mill group to form an austenite structure, enabling the austenite structure to enter a hot stamping deep processing technology through an output roller way to be insulated, enabling the plate to form a stable and uniform austenite structure, and carrying out stamping quenching through a hot stamping die. The process avoids the resource waste caused by laminar cooling, curling and initial heating and warming of hot stamping deep processing in the traditional thin slab continuous casting and rolling process, realizes the integrated production from raw materials to products, saves the transportation cost of intermediate links, and has important significance in the aspects of saving energy, improving the economic benefit of enterprises, protecting the environment and shortening the production period.
Drawings
FIG. 1 is a schematic view of a process for producing high-strength steel by a continuous casting and rolling process of a thin slab in the prior art;
FIG. 2 is a schematic view of a hot stamping deep processing process in the prior art;
FIG. 3 is a schematic process flow diagram of the present invention;
FIG. 4 is a flow diagram of a heating process of the present invention;
Detailed Description
The invention is described below with reference to the drawings and the detailed description.
The technical scheme provided by the invention is a method for manufacturing a high-strength steel plate in a short process, wherein in the process of sheet billet continuous casting and rolling treatment, a sheet billet subjected to finish rolling treatment by a finishing mill set is obtained, then the sheet billet is directly sheared into a preset size, and after induction heating is carried out to meet the target temperature of hot stamping, hot stamping processing is carried out to manufacture the high-strength steel plate.
Preferably, the method comprises the steps of thin slab continuous casting and rolling treatment and hot stamping deep processing treatment; the thin slab continuous casting and rolling treatment comprises the following steps in sequence: continuous casting treatment, rough rolling treatment of a rough rolling unit, pendulum shear treatment, induction heating treatment, descaling box treatment and finish rolling treatment of a finishing rolling unit; the hot stamping deep processing treatment comprises the following steps according to the sequence of treatment: shearing treatment, induction heating treatment, heat preservation treatment, stamping quenching treatment, laser cutting treatment and shot blasting treatment.
Preferably, the thickness of the high-strength steel plate is 0.6-2.5 mm.
Preferably, in the thin slab continuous casting and rolling treatment, the temperature of the thin slab after the continuous casting treatment is 1500 ℃, then after the rough rolling treatment of a rough rolling mill set, the temperature is reduced to 950 +/-20 ℃, the temperature is increased to 1150 +/-50 ℃ after the induction heating treatment, and the temperature is reduced to 880 +/-30 ℃ after the finish rolling treatment of a finishing rolling mill set.
Preferably, the roughing mill group is a four-high mill, and the finishing mill group is a four-high mill.
Preferably, the roughing mill group is a 3-stand roughing mill, and the finishing mill group is a 5-stand finishing mill.
Preferably, in the hot stamping deep processing treatment process, the temperature of the hot stamping deep processing treatment is 880 +/-30 ℃ after the induction heating treatment, the heat preservation is carried out for 180-250 s in the heat preservation treatment, in the stamping quenching treatment, the cooling speed of a stamping quenching die is set to be 55 +/-10 ℃/s, and the temperature is cooled to be 170 +/-50 ℃ after the treatment.
Preferably, a press-quenching die is used in the press-quenching process, and a cooling pipe for quenching and cooling the plate material is provided inside the die.
Preferably, the high-strength steel sheet has a uniform martensite structure and a tensile strength of 1550 MPa.
Preferably, the high-strength steel sheet produced by the above method is characterized in that: the raw materials are as follows by mass percent: 0.225% of C, 1.24% of Mn, 0.03% of Al, 0.163% of Cr, 0.256% of Si, 0.003% of B, 0.013% of P, 0.003% of S and the balance of iron.
Preferably, the high-strength steel plate is applied to automobile production.
Examples
In the embodiment of the invention, raw materials are selected, wherein the raw materials comprise the following components in percentage by mass: 0.225% of C, 1.24% of Mn, 0.03% of Al, 0.163% of Cr, 0.256% of Si, 0.003% of B, 0.013% of P and 0.003% of S. In the raw material, B is segregated at the austenite grain boundary during the quenching process, so that the generation of ferrite, pearlite and bainite is inhibited, and the generation of martensite is ensured.
Molten steel formed by smelting the raw materials is manufactured into a high-strength steel plate through a process flow schematic diagram shown in figure 3.
The specific process route is as follows: the method comprises the steps of thin slab continuous casting and rolling treatment and hot stamping deep processing treatment; the thin slab continuous casting and rolling treatment comprises the following steps in sequence: continuous casting treatment, rough rolling treatment of a rough rolling unit, pendulum shear treatment, induction heating treatment, descaling box treatment and finish rolling treatment of a finishing rolling unit; the hot stamping deep processing treatment comprises the following steps according to the sequence of treatment: shearing treatment, induction heating treatment, heat preservation treatment, stamping quenching treatment, laser cutting treatment and shot blasting treatment. Wherein, the rough rolling mill group and the finishing rolling mill group are both four-high rolling mills. The roughing mill group is a 3-frame roughing mill, and the finishing mill group is a 5-frame finishing mill. In addition, the thickness of the formed plate is 0.6-2.0 mm. As shown in fig. 4, in the continuous casting and rolling process of the thin slab, the temperature of the thin slab is 1500 ℃ after the continuous casting process, then the temperature is reduced to 950 ± 20 ℃ after the rough rolling process of the rough rolling mill set, the temperature is increased to 1150 ± 50 ℃ after the induction heating process, and the temperature is reduced to 880 ± 30 ℃ after the finish rolling process of the finishing rolling mill set. So as to ensure that the austenite structure required by the subsequent hot stamping deep processing is generated in the temperature range. In the process of hot stamping deep processing, the temperature of the hot stamping deep processing is 880 +/-30 ℃ after induction heating treatment, the temperature is kept for 180-250 s in heat preservation treatment, the cooling speed of a stamping quenching die is set to be 55 +/-10 ℃/s in stamping quenching treatment, and the temperature is cooled to be 170 +/-50 ℃ after treatment. The guarantee can have better cooling effect to the forming part, guarantees that panel can cool off fast at the deformation in-process, obtains the super strength steel part that has even martensite structure at room temperature.
On the basis of the above-described embodiments, the following examples were carried out:
example 1
In the process of continuous casting and rolling of thin slabs, the temperature of the thin slabs after continuous casting is 1500 ℃, then after rough rolling of a roughing mill set, the temperature is reduced to 930 ℃, the temperature is increased to 1100 ℃ after induction heating, and the temperature is reduced to 850 ℃ after finish rolling of a finishing mill set.
After the finish rolling of the finishing mill group, the plate directly enters hot stamping deep processing, the plate is sheared into the shape and size required by a hot stamping die through shearing of a shearing device, the plate enters subsequent flow processing through a conveying roller way, the temperature is 850 ℃ in the hot stamping deep processing process, and the heat is preserved for 180-250 s, so that the plate forms a stable austenite structure.
And transferring the heat-insulated high-temperature plate to a hot stamping die for hot stamping through a high-temperature intelligent manipulator.
In the stamping and quenching treatment, the cooling speed of the stamping and quenching die is set to be 45 ℃/s, the stamping and quenching die is cooled to 120 ℃, a formed part can be well cooled, and the plate can be rapidly cooled in the deformation process. The ultrahigh-strength steel part with uniform martensite structure at room temperature is obtained, and the tensile strength of the formed stamping and quenching product reaches 1550 MPa.
And carrying out laser cutting and shot blasting post-treatment on the workpiece formed in the stamping and quenching die to meet the size requirement of the formed workpiece and eliminate the surface scale of the formed workpiece.
Through the process, the integrated production of the formed plate from raw materials to products is realized, and the parts subjected to laser cutting and shot blasting are packaged into finished products and conveyed to various automobile production enterprises.
Example 2
In the process of continuous casting and rolling of thin slabs, the temperature of the thin slabs after continuous casting is 1500 ℃, then after rough rolling of a rough rolling mill set, the temperature is reduced to 950 ℃, the temperature is increased to 1150 ℃ after induction heating, and the temperature is reduced to 880 ℃ after finish rolling of a finishing rolling mill set.
After the finish rolling of the finishing mill group, the plate directly enters hot stamping deep processing, the plate is sheared into the shape and size required by a hot stamping die through shearing of a shearing device, the plate enters subsequent flow processing through a conveying roller way, the temperature is 880 ℃ in the hot stamping deep processing process, and the heat is preserved for 180-250 s, so that the plate forms a stable austenite structure.
And transferring the heat-insulated high-temperature plate to a hot stamping die for hot stamping through a high-temperature intelligent manipulator.
In the stamping and quenching treatment, the cooling speed of the stamping and quenching die is set to be 55 ℃/s, the stamping and quenching die is cooled to 170 ℃, a formed part can be well cooled, and the plate can be rapidly cooled in the deformation process. The ultrahigh-strength steel part with uniform martensite structure at room temperature is obtained, and the tensile strength of the formed stamping and quenching product reaches 1550 MPa.
And carrying out laser cutting and shot blasting post-treatment on the workpiece formed in the stamping and quenching die to meet the size requirement of the formed workpiece and eliminate the surface scale of the formed workpiece.
Through the process, the integrated production of the formed plate from raw materials to products is realized, and the parts subjected to laser cutting and shot blasting are packaged into finished products and conveyed to various automobile production enterprises.
Example 3
In the process of continuous casting and rolling of thin slabs, the temperature of the thin slabs after continuous casting is 1500 ℃, then after rough rolling of a rough rolling mill set, the temperature is reduced to 970 ℃, the temperature is increased to 1200 ℃ after induction heating, and the temperature is reduced to 910 ℃ after finish rolling of a finishing rolling mill set.
After the finish rolling of the finishing mill group, the plate directly enters hot stamping deep processing, the plate is sheared into the shape and size required by a hot stamping die through shearing of a shearing device, the plate enters subsequent flow processing through a conveying roller way, the temperature is 910 ℃ in the hot stamping deep processing process, and the heat is preserved for 180-250 s, so that the plate forms a stable austenite structure.
And transferring the heat-insulated high-temperature plate to a hot stamping die for hot stamping through a high-temperature intelligent manipulator.
In the stamping and quenching treatment, the cooling speed of the stamping and quenching die is set to 65 ℃/s, the stamping and quenching die is cooled to 220 ℃, a formed part can be well cooled, and the plate can be rapidly cooled in the deformation process. The ultrahigh-strength steel part with uniform martensite structure at room temperature is obtained, and the tensile strength of the formed stamping and quenching product reaches 1550 MPa.
And carrying out laser cutting and shot blasting post-treatment on the workpiece formed in the stamping and quenching die to meet the size requirement of the formed workpiece and eliminate the surface scale of the formed workpiece.
Through the process, the integrated production of the formed plate from raw materials to products is realized, and the parts subjected to laser cutting and shot blasting are packaged into finished products and conveyed to various automobile production enterprises.
According to the embodiment, the technical flows of continuous casting and rolling of the sheet billet and deep processing of hot stamping are reconstructed, and the limitation of full-continuous customized production space of upstream and downstream enterprises can be effectively solved through the temperature control process, so that the resource and energy are saved, and low-cost production is realized.
Claims (5)
1. A method for manufacturing a high-strength steel plate in a short process is characterized by comprising the following steps: in the process of sheet billet continuous casting and rolling treatment, obtaining a sheet billet subjected to finish rolling treatment by a finishing mill group, directly shearing the sheet billet into a preset size, performing hot stamping processing after induction heating meets the hot stamping target temperature, and manufacturing a high-strength steel plate which comprises sheet billet continuous casting and rolling treatment and hot stamping deep processing treatment; the thin slab continuous casting and rolling treatment comprises the following steps in sequence: continuous casting treatment, rough rolling treatment of a rough rolling unit, pendulum shear treatment, induction heating treatment, descaling box treatment and finish rolling treatment of a finishing rolling unit; the hot stamping deep processing treatment comprises the following steps according to the sequence of treatment: shearing treatment, induction heating treatment, heat preservation treatment, stamping quenching treatment, laser cutting treatment and shot blasting treatment, wherein in the thin slab continuous casting and rolling treatment, the temperature of the thin slab after continuous casting treatment is 1500 ℃, then after the thin slab is subjected to rough rolling treatment by a rough rolling mill set, the temperature is reduced to 950 +/-20 ℃, the temperature is increased to 1150 +/-50 ℃ after the thin slab is subjected to induction heating treatment, and the temperature is reduced to 880 +/-30 ℃ after the thin slab is subjected to finish rolling treatment by a finishing rolling mill set; in the process of hot stamping deep processing, the temperature of the hot stamping deep processing is 880 +/-30 ℃ after induction heating treatment, the temperature is kept for 180-250 s in heat preservation treatment, the cooling speed of a stamping quenching die is set to be 55 +/-10 ℃/s in stamping quenching treatment, and the temperature is cooled to be 170 +/-50 ℃ after treatment.
2. The method for manufacturing a high-strength steel plate in a short process according to claim 1, wherein the method comprises the following steps: the thickness of the high-strength steel plate is 0.6-2.5 mm.
3. The method for manufacturing a high-strength steel plate in a short process according to claim 1, wherein the method comprises the following steps: the rough rolling unit is a four-roller mill, and the finishing rolling unit is a four-roller mill; the roughing mill group is a 3-frame roughing mill, and the finishing mill group is a 5-frame finishing mill.
4. The method for manufacturing a high-strength steel plate in a short process according to claim 1, wherein the method comprises the following steps: in the press quenching treatment, a press quenching die is used, and a cooling pipe for quenching and cooling a plate material is provided inside the press quenching die.
5. The method for manufacturing a high-strength steel plate in a short process according to claim 1, wherein the method comprises the following steps: the high-strength steel plate has a uniform martensite structure, and the tensile strength of the high-strength steel plate reaches 1550 MPa.
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| CN109985904A (en) * | 2019-04-30 | 2019-07-09 | 中冶赛迪技术研究中心有限公司 | A kind of method and system of continuous casting and rolling production thermoforming steel |
| CN111872149B (en) * | 2020-07-15 | 2021-02-09 | 燕山大学 | ESP-based dynamic variable rule slab performance gradient distribution forming method |
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