CN107523749A - Based on the method that cutter high-carbon steel is produced completely without head bar strip continuous casting and rolling flow path - Google Patents
Based on the method that cutter high-carbon steel is produced completely without head bar strip continuous casting and rolling flow path Download PDFInfo
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- CN107523749A CN107523749A CN201710642763.XA CN201710642763A CN107523749A CN 107523749 A CN107523749 A CN 107523749A CN 201710642763 A CN201710642763 A CN 201710642763A CN 107523749 A CN107523749 A CN 107523749A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 59
- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 40
- 238000009749 continuous casting Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 118
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 117
- 239000002994 raw material Substances 0.000 claims abstract description 40
- 238000003723 Smelting Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 66
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 238000005554 pickling Methods 0.000 claims description 32
- 230000003014 reinforcing effect Effects 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 14
- 230000006698 induction Effects 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 11
- 238000004321 preservation Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000011819 refractory material Substances 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000009847 ladle furnace Methods 0.000 description 26
- 230000008569 process Effects 0.000 description 14
- 238000005520 cutting process Methods 0.000 description 11
- 238000004806 packaging method and process Methods 0.000 description 9
- 238000003825 pressing Methods 0.000 description 9
- 230000007613 environmental effect Effects 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- B21B1/463—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 continuous process, i.e. the cast not being cut before rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
Present invention offer is a kind of to be included based on the method that cutter high-carbon steel is produced completely without head bar strip continuous casting and rolling flow path：Raw material are selected, raw material include by mass percentage：0.4~0.6% C, 0.15~0.40% Si, 0.50~1.0% Mn ,≤0.015% P ,≤0.012% S, remaining is ferro element；Raw material are carried out to converter smelting successively and LF stoves are smelted；Hot-strip of the molten steel to be formed by ESP producing lines generation different-thickness will be smelted from LF stoves；Stay-warm case is provided between conticaster and roughing mill, stay-warm case is incubated to the strand between conticaster and roughing mill；Stay-warm case includes U-shaped cover body, and cover body includes the first cover body and the second cover body being arranged on inside the first cover body, and the first cover body is steel material, and the second cover body is refractory material.Using the present invention, solve the problems such as high energy consumption that traditional hot-rolled strip comes and big environmental pollution, reach energy-conserving and environment-protective and reduce the purpose of cost.
Description
Technical Field
The invention relates to the technical field of steel, in particular to a method for producing measuring tools and high-carbon steel cutters based on a full endless thin slab continuous casting and rolling process.
Background
In recent years, industrial development environment of China is changed deeply, deep contradiction accumulated for a long time is increasingly prominent, in terms of the steel industry, the excess capacity and the homogenization competition are serious, so that the market is seriously more supplied and demanded, meanwhile, global economy is reduced, the steel industry demand is further caused to be constant, the price is continuously low, meanwhile, the upstream iron ore industry is monopolized, the prices of labor force, land, fuel power and the like are continuously increased, the cost pressure of production elements is increased, the ecological environment constraint is intensified, the enterprise profit space is further compressed, and the steel industry is in a critical head of life and death.
With the continuous decline of the steel market, steel is always in a state of little profit or no profit, so that steel manufacturers are forced to discuss the way of reducing the cost, and the environmental protection is further enhanced and the environmental protection requirement is strict at present at home, so that the discussion of the steel production process which reduces the cost and is environmental protection becomes a necessary survival way.
The ESP is fully utilized to develop and apply new products, the national overall planning and industry planning are met, the relevant policy regulations of national transfer and innovation are met, the high-starting-point development targets of process modernization, equipment maximization, production intensification, resource and energy circulation, energy consumption minimization and economic benefit optimization can be met, and the ESP has very important significance for promoting energy conservation and emission reduction and technical progress of the steel industry and promoting enterprise transfer and upgrade, technological innovation and product structure adjustment.
In view of the limitation of the production specification of the traditional hot rolling and sheet continuous casting and rolling process represented by CSP, the tropical cold can not be further developed, and the industry of high-carbon steel such as measuring tools and props has a tiny profit, and a low-price strip steel is urgently needed to replace the existing high-price cold-rolled strip steel, so that the proposal of the project not only is the production technical requirement of the thin-specification strip steel, but also is the requirement of maximizing the profit of customers
In order to solve the problems, the invention provides a method for producing high-carbon steel of a cutter based on a full endless thin slab continuous casting and rolling process.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for producing high carbon steel for a tool based on a continuous casting and rolling process of a full endless thin slab, so as to solve the problems of high energy consumption, large environmental pollution and the like caused by the conventional hot rolling, and achieve the purposes of energy saving, environmental protection and cost reduction.
The invention provides a method for producing high-carbon steel of a cutter based on a full endless thin slab continuous casting and rolling process, which comprises the following steps: selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.4-0.6% of C, 0.15-0.40% of Si, 0.50-1.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.012% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
the method comprises the following steps of (1) enabling molten steel formed by smelting in an LF furnace to pass through an ESP production line to generate hot-rolled strip steel with different thicknesses, wherein in the ESP production line, the molten steel sequentially passes through a continuous casting machine, a roughing mill, a pendulum shear, waste pushing, a hub shear, an induction heating furnace, a finishing mill, laminar cooling, high-speed flying shears and a coiler;
wherein the temperature of a finish rolling outlet is not lower than 820 ℃, the temperature of a rough rolling inlet is not lower than 900 ℃, and the temperature of an induction heating outlet is not lower than 1100 ℃;
the heat preservation cover is arranged between the continuous casting machine and the roughing mill and used for preserving heat of a casting blank between the continuous casting machine and the roughing mill;
the heat preservation cover comprises a U-shaped cover body, the cover body comprises a first cover body and a second cover body arranged in the first cover body, the first cover body is made of steel, and the second cover body is made of fireproof materials.
In addition, the preferable proposal is that the heat preservation cover also comprises a beam, a first supporting column and a retractable supporting column which are connected with one end of the beam, and a reinforcing plate which is fixed with the other end of the beam,
the cover body is fixed below the reinforcing plate;
the crossbeam is articulated with first support column, scalable support column respectively to the reinforcing plate and the cover body are lifted through scalable support column to the crossbeam.
Preferably, the reinforcing plate is fixed to the other end of the cross member by welding.
In addition, in an ESP production line, the hot-rolled strip steel is cooled to room temperature, then is subjected to acid cleaning, is pressed down by a 1-3% flattening machine after acid cleaning, is straightened by a straightening machine, and then is coiled and uncoiled.
In addition, the thickness of the hot-rolled strip steel is preferably 1.5 to 4.0 mm.
According to the technical scheme, the method for producing the high-carbon steel of the cutter based on the continuous casting and rolling process of the full endless thin slab adopts the ESP process to produce the measuring tool with the thin specification, and the surface of the high-carbon steel of the cutter has no cracks, so that the method not only can meet the production technical requirements of the thin-specification strip steel, but also can meet the requirements of clients on maximizing profits, and in addition, the method can reduce the cost, shorten the production period, save energy and protect environment.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic flow chart of a method for producing high-carbon steel for a cutter based on a full endless thin slab continuous casting and rolling process according to an embodiment of the invention;
fig. 2 is a schematic structural view of a heat-insulating cover according to an embodiment of the invention.
The device comprises a first support column, a telescopic support column, a beam, a reinforcing plate, a first cover body, a second cover body and a supporting frame, wherein the first support column is 1, the telescopic support column is 2, the beam is 3, the reinforcing plate is 4, the first cover body is 5, and the second cover body.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problems of high energy consumption, large environmental pollution and the like caused by the traditional hot rolling, the invention provides a method for producing the cutter high-carbon steel based on the continuous casting and rolling process of the full endless thin slab.
The ESP (Endless Strip Production) Production line is a new generation of thin slab continuous casting and rolling Production line newly built by Avermedi, and can produce a whole steel Strip by one-time casting without any head and tail cutting in the middle, so that the ESP Production line has the advantage of full-continuous Strip Production, and a single continuous casting line has the characteristics of excellent Production capacity, large-scale Production of large-bandwidth Strip steel and high-quality Strip steel, low conversion cost from molten steel to hot rolled coils, most compact Production line process arrangement and the like.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the method for producing the cutter high-carbon steel based on the full-endless thin slab continuous casting and rolling process provided by the invention, fig. 1 shows the method for producing the cutter high-carbon steel based on the full-endless thin slab continuous casting and rolling process according to the embodiment of the invention.
As shown in figure 1, the method for producing the high-carbon steel of the cutter based on the continuous casting and rolling process of the full endless thin slab comprises the following steps:
s110: selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.4-0.6% of C, 0.15-0.40% of Si, 0.50-1.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.012% of S and the balance of iron;
s120: sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
s130: the method comprises the following steps of (1) enabling molten steel formed by smelting in an LF furnace to pass through an ESP production line to generate hot-rolled strip steel with different thicknesses, wherein in the ESP production line, the molten steel sequentially passes through a continuous casting machine, a roughing mill, a pendulum shear, waste pushing, a hub shear, an induction heating furnace, a finishing mill, laminar cooling, high-speed flying shears and a coiler;
wherein the temperature of a finish rolling outlet is not lower than 820 ℃, the temperature of a rough rolling inlet is not lower than 900 ℃, and the temperature of an induction heating outlet is not lower than 1100 ℃;
the heat preservation cover is arranged between the continuous casting machine and the roughing mill and used for preserving heat of a casting blank between the continuous casting machine and the roughing mill;
the heat preservation cover comprises a U-shaped cover body, the cover body comprises a first cover body and a second cover body arranged inside the first cover body, the first cover body is made of steel materials, and the second cover body is made of fireproof materials.
In step S110 of the invention, in the selection of raw materials for generating the high-carbon steel for the measuring tool and the cutter, the mass percent of C is 0.4-0.60%, wherein C is an important element for improving the strength of the material, and the reasonable component design can ensure the use performance of the high-carbon steel for the measuring tool and the cutter and reduce the production cost.
The ratio of Si in the raw material is 0.15-0.40%, and Si dissolves in ferrite to improve the strength of solid solution in steel and the degree of cold work hardening, but the toughness and plasticity of steel are reduced to deteriorate the weldability of steel. However, Si is advantageous in increasing the strength and yield point of the steel.
The Mn accounts for 0.50-1.00% of the raw materials, has the effect of solid solution strengthening, can coarsen crystal grains when the Mn is too high, weakens the corrosion resistance of the steel, and reduces the welding performance. And the increase of Mn content can improve the martensite hardenability, which is not favorable for the elongation.
In step S120, converter and LF furnace smelting is performed according to the above-described components (step S110). That is, molten iron is smelted in a converter and then refined in an LF furnace to obtain molten steel with required components. The converter steelmaking (converter steelmaking) is characterized in that molten iron, scrap steel and ferroalloy are used as main raw materials, and the steelmaking process is completed in a converter by means of heat generated by physical heat of molten iron and chemical reaction among molten iron components without the help of external energy. The converter is mainly used for producing carbon steel, alloy steel and smelting copper and nickel.
An LF (ladle furnace), namely a ladle refining furnace, is a main external refining device in steel production. LF furnaces are generally referred to as refining furnaces in the steel industry, and are actually a special form of electric arc furnaces.
In step S130, in an ESP production line, the temperature of a casting blank entering a rough rolling inlet cannot be lower than 900 ℃, an intermediate blank firstly enters an induction heating furnace before entering a finishing mill group, IH (the temperature of an induction heating outlet is not lower than 1100 ℃, the temperature of the intermediate blank exiting from the induction heating furnace enters the finishing mill group, and the temperature of a finishing rolling outlet is not lower than 820 ℃, in addition, in the ESP production line, different parameters are set on a generating device according to actual requirements, so that measuring tools with different thicknesses of 1.5-4.0 mm and high-carbon steel for a cutter are generated, the generated hot-rolled strip steel is slowly cooled to room temperature and then conveyed to a continuous pickling leveling line for subsequent treatment, welding process parameters are optimized, pickling parameters are reasonably controlled, the pickled strip steel is pressed down by a leveling machine with about 1-3 percent after pickling, is straightened by a tension leveler and then coiled and unloaded, and then is packaged and stored, generally speaking, the thickness of the generated measuring, The tensile strengths are inversely proportional to each other, and if the thickness of the resulting high-carbon steel for gauges and tools is large, the yield strength and tensile strength thereof decrease, and if the thickness of the resulting high-carbon steel for gauges and tools is small, the yield strength and tensile strength thereof increase.
It should be noted that IH is an induction heating outlet temperature, the induction heating furnace is located at a position behind the hub shear and in front of the finishing mill, the induction heating is used for heating strip steel to ensure a finishing rolling temperature, or to adjust the temperature of the intermediate billet, the IH temperature is determined according to the requirement of strip steel finishing rolling and considering the surface quality of the strip steel, the finishing rolling temperature is inappropriate when the IH temperature is lower than a certain temperature, and energy is wasted when the IH temperature is higher than a certain temperature.
In an ESP production line, molten steel smelted from an LF furnace enters a continuous casting machine, a casting blank from the continuous casting machine directly enters a 3-frame roughing mill to be made into an intermediate blank (wherein the inlet temperature of the casting blank entering a combined rolling mill set is not lower than 900 ℃), then a wedge-shaped section at the head of the casting blank is segmented and cut off through pendulum shear, and then the casting blank enters a stacker (the stacker has the function of taking off the line at the stacker when the following equipment fails). The hot rolled strip steel directly passes through the rolling mill during normal rolling, then the intermediate billet is subjected to head and tail cutting by a rotating hub type flying shear, then the intermediate billet enters an induction heating furnace to be heated to be not lower than 1100 ℃, and then the intermediate billet enters a finishing mill group and is discharged from the finishing mill group to generate the hot rolled strip steel. And (2) carrying out laminar cooling on the hot-rolled strip steel generated from the finishing mill group to room temperature, then conveying the hot-rolled strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing down the hot-rolled strip steel by a leveling machine of about 1-3% after pickling, coiling and uncoiling the hot-rolled strip steel after straightening by a straightening machine, and then packaging and storing the hot-rolled strip steel.
It should be noted that, in order to ensure the rough rolling inlet temperature and the higher pulling speed so as to improve the production efficiency, a heat-insulating cover is added at the outlet of the continuous casting section before rough rolling, wherein the heat-insulating cover is of a U-shaped structure, the length of the heat-insulating cover is 1.2-2m, a refractory material is arranged in the heat-insulating cover, the rough rolling inlet temperature can be ensured through the heat-insulating cover, and meanwhile, when the pulling speed is lower than 4.8m/min, a liquid core in a casting blank enters the rough rolling machine to cause a rolling leakage accident.
In order to explain the structure of the heat-insulating cover in detail, fig. 2 shows the structure of the heat-insulating cover according to the embodiment of the present invention.
As shown in fig. 2, the heat-insulating cover comprises a cross beam 3, a first supporting column 1 and a telescopic supporting column 2 which are supported at one end of the cross beam 3, a reinforcing plate 4 fixed at the other end of the cross beam 3, and a cover body fixed with the reinforcing plate 4.
The cover body is of a U-shaped structure and comprises a first cover body 5 and a second cover body 6 arranged inside the first cover body 5, the first cover body 5 is made of steel, the second cover body 6 is made of refractory materials, and the second cover body 6 made of refractory materials can insulate a casting blank between the continuous casting machine and the roughing mill.
In the embodiment of the invention, the reinforcing plate 4 is fixed on the other end of the cross beam 3 by welding, the cover body is fixed below the reinforcing plate 4, the cross beam 3 is respectively hinged with the first supporting column 1 and the telescopic supporting column 2, and the cross beam 3 lifts the reinforcing plate 4 and the cover body through the telescopic supporting column 2.
It should be noted that, telescopic support column 2 is used for jack-up crossbeam 3, there is impurity when the second cover body 6 is inside, when needing the clearance of removing dust, telescopic support column 2 extends its length, jack-up crossbeam 3, because crossbeam 3 and reinforcing plate 4 welded fastening, crossbeam 3 lifts the cover body through reinforcing plate 4, make the cover body leave the product line, make things convenient for the staff to remove dust the clearance to the internal second cover body 6 of cover, after the clearance finishes, telescopic support column 2 shortens its length, make crossbeam 3 descend, crossbeam 3 drives the cover body and gets back to on the production line between conticaster and the roughing mill.
That is, the telescopic support columns 2 act like jacks for lifting the enclosure off or back onto the production line between the caster and the roughing mill under the action of the cross beams 3.
In addition, it should be noted that the reinforcing plate 4 functions as a reinforcing rib, and in the structural design process, if the overhanging surface of the structural body is too large or the span is too large, and the load that can be borne by the connecting surface of the structural body is limited, a reinforcing plate is added on the common vertical surface of the two combined bodies to increase the strength of the combining surface.
The invention is further illustrated by the following examples, in accordance with the above-described method for producing high carbon steel for thin gauge tools.
Example 1
Selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.51654% of C, 0.23767% of Si, 0.5995% of Mn, 0.01184% of P, 0.0001% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
molten steel formed by smelting in an LF furnace is processed by an ESP production line to generate hot rolled strip steel with different thicknesses, wherein in the ESP production line, the rough rolling inlet temperature is 900 ℃, and the finish rolling outlet temperature is 820 ℃;
and (2) after the strip steel is slowly cooled to room temperature, conveying the strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing the strip steel by a leveling machine of about 1 percent after pickling, straightening the strip steel by a withdrawal and straightening machine, coiling, unloading, packaging and storing.
The specifications of the produced high-carbon steel for cutting tools are as follows: 2.50X 1250mm, yield strength: 484Mpa, tensile strength: 792MPa, elongation: 18.0 percent.
Example 2
Selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.49984% of C, 0.23021% of Si, 0.59951% of Mn, 0.01062% of P, 0.00053% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
molten steel formed by smelting in an LF furnace is processed by an ESP production line to generate hot rolled strip steel with different thicknesses, wherein in the ESP production line, the rough rolling inlet temperature is 950 ℃, and the finish rolling outlet temperature is 830 ℃;
and (2) after the strip steel is slowly cooled to room temperature, conveying the strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing down the strip steel by a leveling machine of about 2 percent after pickling, straightening the strip steel by a straightening machine, coiling and uncoiling the strip steel, and packaging and storing the strip steel.
The specifications of the produced high-carbon steel for cutting tools are as follows: 1.5 × 1250mm, yield strength: 476Mpa, tensile strength: 783MPa, elongation: 18.0 percent.
Example 3
Selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.51678% of C, 0.23388% of Si, 0.59833% of Mn, 0.01112% of P, 0.00086% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
molten steel formed by smelting in an LF furnace is processed by an ESP production line to generate hot rolled strip steel with different thicknesses, wherein in the ESP production line, the rough rolling inlet temperature is 960 ℃, and the finish rolling outlet temperature is 850 ℃;
and (2) after the strip steel is slowly cooled to room temperature, conveying the strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing the strip steel by a leveling machine of about 3 percent after pickling, straightening the strip steel by a straightening machine, coiling and uncoiling the strip steel, and packaging and storing the strip steel.
The specifications of the produced high-carbon steel for cutting tools are as follows: 1.6 × 1250mm, yield strength: 488Mpa, tensile strength: 768MPa, elongation: 21.0 percent.
Example 4
Selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.46705% of C, 0.23057% of Si, 0.8828% of Mn, 0.01068% of P, 0.00018% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
molten steel formed by smelting in an LF furnace is processed by an ESP production line to generate hot rolled strip steel with different thicknesses, wherein in the ESP production line, the rough rolling inlet temperature is 900 ℃, and the finish rolling outlet temperature is 830 ℃;
and (2) after the strip steel is slowly cooled to room temperature, conveying the strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing the strip steel by a leveling machine of about 1 percent after pickling, straightening the strip steel by a withdrawal and straightening machine, coiling, unloading, packaging and storing.
The specifications of the produced high-carbon steel for cutting tools are as follows: 2.0X 1250mm, yield strength: 431Mpa, tensile strength: 710MPa, elongation: 22 percent.
Example 5
Selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.4946% of C, 0.23624% of Si, 0.60912% of Mn, 0.0108% of P, 0.0001% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
molten steel formed by smelting in an LF furnace is processed by an ESP production line to generate hot rolled strip steel with different thicknesses, wherein in the ESP production line, the rough rolling inlet temperature is 900 ℃, and the finish rolling outlet temperature is 870 ℃;
and (2) after the strip steel is slowly cooled to room temperature, conveying the strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing down the strip steel by a leveling machine of about 2 percent after pickling, straightening the strip steel by a straightening machine, coiling and uncoiling the strip steel, and packaging and storing the strip steel.
The specifications of the produced high-carbon steel for cutting tools are as follows: 1.8 × 1250mm, yield strength: 504Mpa, tensile strength: 807MPa, elongation: 18 percent.
Example 6
Selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.50932% of C, 0.22942% of Si, 0.60887% of Mn, 0.01029% of P, 0.0001% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
molten steel formed by smelting in an LF furnace is processed by an ESP production line to generate hot rolled strip steel with different thicknesses, wherein in the ESP production line, the rough rolling inlet temperature is 970 ℃, and the finish rolling outlet temperature is 840 ℃;
and (2) after the strip steel is slowly cooled to room temperature, conveying the strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing down the strip steel by a leveling machine of about 2 percent after pickling, straightening the strip steel by a straightening machine, coiling and uncoiling the strip steel, and packaging and storing the strip steel.
The specifications of the produced high-carbon steel for cutting tools are as follows: 2.0X 1250mm, yield strength: 480Mpa, tensile strength: 778MPa, elongation: 22 percent.
Example 7
Selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.46619% of C, 0.22401% of Si, 0.89998% of Mn, 0.01011% of P, 0.0001% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
molten steel formed by smelting in an LF furnace is processed by an ESP production line to generate hot rolled strip steel with different thicknesses, wherein in the ESP production line, the rough rolling inlet temperature is 930 ℃, and the finish rolling outlet temperature is 850 ℃;
and (2) after the strip steel is slowly cooled to room temperature, conveying the strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing the strip steel by a leveling machine of about 3 percent after pickling, straightening the strip steel by a straightening machine, coiling and uncoiling the strip steel, and packaging and storing the strip steel.
The specifications of the produced high-carbon steel for cutting tools are as follows: 2.3 × 1250mm, yield strength: 587MPa, tensile strength: 784MPa, elongation: 21.5 percent.
Example 8
Selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.46589% of C, 0.23849% of Si, 0.89317% of Mn, 0.01046% of P, 0.0001% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
molten steel formed by smelting in an LF furnace is processed by an ESP production line to generate hot rolled strip steel with different thicknesses, wherein in the ESP production line, the rough rolling inlet temperature is 960 ℃, and the finish rolling outlet temperature is 890 ℃;
and (2) after the strip steel is slowly cooled to room temperature, conveying the strip steel to a continuous pickling leveling line for subsequent treatment, optimizing welding process parameters, reasonably controlling pickling parameters, pressing the strip steel by a leveling machine of about 3 percent after pickling, straightening the strip steel by a straightening machine, coiling and uncoiling the strip steel, and packaging and storing the strip steel. .
The specifications of the produced high-carbon steel for cutting tools are as follows: 3.0X 1250mm, yield strength: 447MPa, tensile strength: 759MPa, elongation: 20.5 percent.
It should be noted that the fluctuation in thickness of the high-carbon steel for measuring tools and cutting tools produced in the above embodiments is very small and negligible, and the fluctuation in yield strength and tensile strength is about 30MPa, which is described herein.
According to the embodiment, the method for producing the high-carbon steel for the cutter based on the full endless thin slab continuous casting and rolling process, provided by the invention, adopts the ESP process to produce the measuring tool and the high-carbon steel for the cutter, can solve the problems of large thickness, high cost and the like of the measuring tool and the high-carbon steel for the cutter generated by the traditional hot rolling and thin slab continuous casting and rolling process represented by CSP, and achieves the purposes of energy conservation, environmental protection and cost reduction.
The method for producing a cutter high-carbon steel based on an all endless thin slab continuous casting and rolling process proposed according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the method for producing high carbon steel for tools based on the continuous casting and rolling process of the endless thin slab as set forth in the above description without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (5)
1. A method for producing high-carbon steel of a cutter based on a full endless thin slab continuous casting and rolling process is characterized by comprising the following steps:
selecting raw materials, wherein the raw materials comprise the following components in percentage by mass: 0.4-0.6% of C, 0.15-0.40% of Si, 0.50-1.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.012% of S and the balance of iron;
sequentially carrying out converter smelting and LF furnace smelting on the raw materials;
the method comprises the following steps of enabling molten steel formed by smelting in the LF furnace to pass through an ESP production line to generate hot-rolled strip steel with different thicknesses, wherein in the ESP production line, the molten steel sequentially passes through a continuous casting machine, a roughing mill, a pendulum shear, waste pushing, a hub shear, an induction heating furnace, a finishing mill, laminar cooling, high-speed flying shears and a coiler; wherein,
the temperature of a finish rolling outlet is not lower than 820 ℃, the temperature of a rough rolling inlet is not lower than 900 ℃, and the temperature of an induction heating outlet is not lower than 1100 ℃;
a heat preservation cover is arranged between the continuous casting machine and the roughing mill and used for preserving heat of a casting blank between the continuous casting machine and the roughing mill;
the heat preservation cover comprises a U-shaped cover body, the cover body comprises a first cover body and a second cover body arranged inside the first cover body, the first cover body is made of steel materials, and the second cover body is made of fireproof materials.
2. The method for producing high-carbon steel for tools based on the continuous casting and rolling process of the full endless thin slab according to claim 1,
the heat preservation cover also comprises a beam, a first supporting column and a telescopic supporting column which are connected with one end of the beam, and a reinforcing plate which is fixed with the other end of the beam,
the cover body is fixed below the reinforcing plate;
the crossbeam respectively with first support column, scalable support column is articulated, and the crossbeam passes through scalable support column lifts up the reinforcing plate with the cover body.
3. The method for producing high-carbon steel for tools based on the continuous casting and rolling process of the full endless thin slab according to claim 2,
the reinforcing plate is fixed on the other end of the cross beam in a welding mode.
4. The method for producing high-carbon steel for tools based on the continuous casting and rolling process of the full endless thin slab according to claim 1,
in the ESP production line, the hot-rolled strip steel is cooled to room temperature, then is subjected to acid pickling, is pressed down by a 1-3% leveler after the acid pickling, and is then coiled and uncoiled after being straightened by a tension leveler.
5. The method for producing high-carbon steel for tools based on the continuous casting and rolling process of the full endless thin slab according to claim 1,
the thickness of the hot-rolled strip steel is 1.5-4.0 mm.
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| CN108480417A (en) * | 2018-02-01 | 2018-09-04 | 日照宝华新材料有限公司 | Continuous producing line, which is plated, based on thin slab continuous casting and rolling hot radical raw material and acid produces method of the 600g zinc layers without zinc flower hot-galvanized plate |
| CN108950382A (en) * | 2018-06-25 | 2018-12-07 | 日照钢铁控股集团有限公司 | A method of continuous producing line production hot radical is plated without flower galvanized sheet based on output strip line without a head and acid |
| CN109482648A (en) * | 2018-10-31 | 2019-03-19 | 燕山大学 | ESP production line roughing section microstructure homogenization rolling system and its method |
| CN112077143A (en) * | 2020-07-30 | 2020-12-15 | 河北新金轧材有限公司 | Continuous plate production line for hot-rolled coiled plates |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108480417A (en) * | 2018-02-01 | 2018-09-04 | 日照宝华新材料有限公司 | Continuous producing line, which is plated, based on thin slab continuous casting and rolling hot radical raw material and acid produces method of the 600g zinc layers without zinc flower hot-galvanized plate |
| CN108480417B (en) * | 2018-02-01 | 2021-04-13 | 日照宝华新材料有限公司 | Method for producing 600g zinc layer non-spangle hot galvanized plate based on thin slab continuous casting and rolling hot base raw material and acid plating continuous production line |
| CN108950382A (en) * | 2018-06-25 | 2018-12-07 | 日照钢铁控股集团有限公司 | A method of continuous producing line production hot radical is plated without flower galvanized sheet based on output strip line without a head and acid |
| CN109482648A (en) * | 2018-10-31 | 2019-03-19 | 燕山大学 | ESP production line roughing section microstructure homogenization rolling system and its method |
| CN109482648B (en) * | 2018-10-31 | 2020-08-11 | 燕山大学 | Microstructure homogenization rolling system and method in rough rolling section of ESP production line |
| CN112077143A (en) * | 2020-07-30 | 2020-12-15 | 河北新金轧材有限公司 | Continuous plate production line for hot-rolled coiled plates |
| CN112077143B (en) * | 2020-07-30 | 2022-04-19 | 河北新金轧材有限公司 | Continuous plate production line for hot-rolled coiled plates |
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