CN112322866A - Process and device for producing medium-high manganese steel plate strip - Google Patents
Process and device for producing medium-high manganese steel plate strip Download PDFInfo
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- 238000004320 controlled atmosphere Methods 0.000 claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
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- 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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
-
- 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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
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- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a process and a device for producing a medium-high manganese steel plate strip, belongs to the technical field of steelmaking smelting control, and solves the problem that macrosegregation of inclusions and manganese elements influences the quality of steel in the traditional preparation process. The process comprises the following steps: step 1, directly and continuously casting molten metal to form a thin strip of 2-4 mm; step 2, heating the thin strip to 1413K-1420K; step 3, feeding the heated thin strip into a controlled atmosphere decarburization furnace for solid decarburization; the temperature in the controlled atmosphere decarburization furnace is 1413K to 1420K, the controlled atmosphere decarburization furnace is internally provided with a decarburization atmosphere, and the decarburization atmosphere comprises Ar-H2‑H2O, the pressure in the controlled atmosphere decarburization furnace is 0.2-1 MPa, PH2O/PH2Controlling the temperature to be 0.30-0.55; step 4, rolling the thin strip after the decarburization is finished; step 5, rolling the thin strip and then carrying outAnd (4) performing heat treatment to obtain the medium and high manganese steel plate strip. The method is suitable for preparing the medium and high manganese steel plate strip.
Description
Technical Field
The invention belongs to the technical field of steelmaking smelting control, and particularly relates to a process and a device for producing medium and high manganese steel plates and strips.
Background
Automobiles are one of the important vehicles in modern life, and oil consumption, pollution and safety problems are three major challenges facing the development of the automotive industry. The improvement of the strength of the steel for automobiles can reduce oil consumption and pollutant emission, and simultaneously improve safety, and the development of the steel for automobiles with high strength and high plasticity gradually becomes a trend of future development of the automobile industry. The first generation and the second generation of high-strength steel for automobiles can not meet the increasingly severe requirements of the steel for modern automobiles on safety, energy conservation, cost and the like. The third generation advanced high-strength steel represented by medium/high manganese steel has the most research and development potential.
The lightweight requirement of automobiles is advanced, the high-strength steel is developed towards the direction of lightness and thinness, the cleanliness of steel is particularly important, the thinner the final product is, the higher the requirement on the cleanliness of steel is, the higher and higher the requirements on low inclusions in steel, reduction of macro segregation of elements and the like are, and the premise of fine structure regulation and control of high-strength steel iron materials in the future is to greatly reduce the inclusions, promote columnar crystal orientation equiaxial crystal transformation and reduce or eliminate macro segregation. The traditional smelting process of the sheet steel strip in China comprises blast furnace ironmaking, converter oxygen blowing and decarburization, external refining and alloying deoxidation for inclusion removal and continuous casting. The whole process is essentially a reduction-oxidation-reduction process, which causes a large resource consumption. In addition, residual oxygen and inclusions in the molten steel after refining still have a certain influence on the quality of the steel.
At present, the existing process flow mainly reduces the influence of inclusions on plasticity, lightens the macro segregation of elements and greatly improves the strength and the plasticity of the automobile steel by methods such as low alloy design, thermal mechanical treatment, inclusion control, macro segregation control and the like. The process provided by the invention is beneficial to further reducing the content of inclusions, improving the macro segregation of elements, reducing the production cost and reducing the rolling resistance, provides a feasible method for producing high-strength steel for automobiles, and is mainly applied to automobile anti-collision beams and A, B columns. In order to further improve the light and thin requirements of the automobile steel, the invention has great advantages in the aspects of reducing production cost, eliminating inclusions, improving macrosegregation and the like.
Disclosure of Invention
In view of the above analysis, the invention aims to provide a process and a device for producing a medium-high manganese steel plate strip, which are used for solving the problem that macrosegregation of inclusions and manganese elements influences the quality of steel in the traditional preparation process, shortening the steel smelting process, reducing the production cost and improving the mechanical property of the steel.
The purpose of the invention is mainly realized by the following technical scheme:
on one hand, the invention provides a process for producing a medium-high manganese steel plate strip, which comprises the following steps:
step 1, directly and continuously casting molten metal to form a thin strip of 2-4 mm;
step 2, heating the thin strip to 1413K-1420K;
the temperature in the controlled atmosphere decarburization furnace is 1413K to 1420K, the controlled atmosphere decarburization furnace is internally provided with a decarburization atmosphere, and the decarburization atmosphere comprises Ar-H2-H2O, the pressure in the controlled atmosphere decarburization furnace is 0.2-1 MPa, PH2O/PH2Controlling the temperature to be 0.30-0.55;
and 5, rolling the thin strip and then carrying out heat treatment to obtain the medium-high manganese steel plate strip.
In one possible embodiment, the rolling of the thin strip is carried out as follows: the method comprises the steps of conveying a thin strip to a rolling mill through a supporting roller, carrying out multi-pass hot rolling at the beginning rolling temperature of 1000-1400K and the final rolling temperature of not less than 900K, wherein the final thickness of the hot rolling is 1.0-3 mm, cooling to room temperature after the hot rolling, removing surface oxide skin through acid washing, and carrying out multi-pass rolling on the thin strip in a cold rolling mill to obtain a plate strip with the thickness of 0.5-1.5 mm.
In one possible design, the heat treatment is to carry out annealing treatment on a plate strip obtained after cold rolling in a two-phase region, wherein the annealing temperature is 823-1023K, and the annealing time is 0.5-5 h.
In one possible design, the heating process of the controlled atmosphere decarburization furnace is:
firstly, Ar-H is introduced into a controlled atmosphere decarburization furnace2Mixing the gases, controlling the temperature of the controlled atmosphere decarburization furnace to rise, and after the temperature in the controlled atmosphere decarburization furnace rises to 1413K-1420K, Ar-H is added2The gas path of the mixed gas is switched to Ar-H2The mixed gas firstly passes through a water bath box before being introduced into the controlled atmosphere decarburization furnace, a certain amount of water vapor is brought out and enters the controlled atmosphere decarburization furnace, and the amount of the brought water vapor is controlled by adjusting the temperature of the water bath box according to the dew point to form a decarburization atmosphere;
the decarbonization atmosphere passes through the decarbonization furnace with a controlled atmosphere at a certain flow rate.
Further, the gas flow rate of the decarburization atmosphere is 500 to 600 mL/min.
Further, Ar-H2H in the mixed gas2The content is controlled to be 9-20% by volume fraction.
In one possible design, the molten metal in step 1 is prepared by performing melting reduction on raw materials (such as iron ore) in a blast furnace or a non-blast furnace, performing desulfurization, desiliconization and dephosphorization pretreatment, and adjusting alloy components to required contents, wherein the content of C in the molten metal is 3.0-3.8 wt%.
In one possible design, the molten metal in step 1 is prepared by performing melting reduction on raw materials (such as iron ore) in a blast furnace or a non-blast furnace, performing desulfurization, desiliconization and dephosphorization pretreatment, blowing semi-steel out of a converter, performing partial decarburization, performing external refining, and adjusting alloy components to required content, wherein the content of C in the molten metal is 1-2 wt%.
Further, the Mn content in the molten metal is 5 wt% -25 wt%.
On the other hand, the invention also provides a device for producing the high manganese steel plate strip, which comprises a ladle, a thin plate strip continuous casting machine, a heating device, a controlled atmosphere decarburization furnace, a rolling mill and a gas supply device;
the ladle is used for directly pouring molten metal to the thin plate strip continuous casting machine to be solidified into a thin strip;
the heating device is arranged between the thin plate strip continuous casting machine and the controllable atmosphere decarburization furnace and is used for rapidly heating the solidified thin strip;
the two ends of the controlled atmosphere decarburization furnace are respectively provided with an air inlet and an air outlet which are used for ensuring that the decarburization atmosphere passes through the controlled atmosphere decarburization furnace at a certain flow rate;
the gas supply device is connected with the gas inlet and is used for providing a decarburization atmosphere for the controlled atmosphere decarburization furnace;
the rolling mill is used for rolling the thin strip subjected to decarburization.
In one possible design, the controlled atmosphere decarburization furnace is internally provided with support rolls for supporting the strip so that the decarburization atmosphere passes through the upper and lower surfaces of the strip.
Compared with the prior art, the invention can at least realize one of the following technical effects:
(1) in the solid decarburization process of the medium-high manganese steel strip, an oxide film is formed on the surface of the thin strip by Mn element to hinder the decarburization reaction, the reaction temperature and atmosphere are strictly controlled, so that C is oxidized but Mn and Fe are not oxidized, and under the process condition of the invention, the oxygen potential of Mn oxide is less than or equal to 10%, and the decarburization is not influenced. The temperature in the controlled atmosphere decarburization furnace is 1413K to 1420K, PH2O/PH2The temperature is controlled to be 0.30-0.55. PH2O/PH2Too high ratio will cause FeO and MnO to be formed on the surface of the thin strip2When the ratio of the metal oxides is too low, C in the thin strip cannot be removed; the higher the decarburization temperature is, the faster the decarburization rate is, but the too high decarburization temperature causes the melting deformation of the thin strip, and the too low decarburization temperature even if P isH2O/PH2At higher ratios, carbon removal by oxidation is also rendered impossible.
(2) The method comprises the steps of directly solidifying the molten iron into a thin strip by a thin slab continuous casting device after necessary pretreatment and alloying (the carbon content is generally 3-3.8 wt percent after molten iron (namely molten metal) is subjected to three-step removal and alloying) by using a blast furnace or molten reduced molten iron, heating by electromagnetic induction and introducing a decarburization atmosphere, and removing carbon in the thin strip to a required level in a gas-solid reaction mode. The carbon content of the obtained medium/high manganese steel thin strip can be reduced to below 0.1 wt% at least through detection, manganese in the thin strip is basically not oxidized, the Mn content can be controlled to be 3 wt% -25 wt% according to component requirements, and the component control range of the advanced high-strength steel for automobiles is met. The preparation method of the advanced high-strength steel plate strip for the automobile provided by the application omits the process nodes of converter decarburization, external refining, plate strip continuous casting, heating, hot rolling and the like in the traditional thin strip production process flow in the process. Because the content of dissolved oxygen in the solid state is extremely low, the method omits or reduces high-strength oxygen blowing, and simultaneously adopts high-carbon molten iron to directly solidify and form, thereby avoiding oxide inclusion and bubble formation to the maximum extent.
(3) According to the method, the metal liquid is solidified and molded by adopting the thin slab continuous casting equipment, so that the rapid preparation of the thin slab band is realized, the problems of large rolling resistance of medium/high manganese steel and the like are solved, the production time is shortened, and the production efficiency of the medium/high manganese steel thin band is improved. In the traditional square billet solidification process, the phenomena of formation of a large amount of columnar crystals, element segregation and the like during cooling of liquid metal can be caused by the fact that an air layer is formed by the contraction of a casting billet and the fact that the temperature of a mould wall is rapidly raised and heat dissipation is difficult.
In addition, the method can also be applied to the existing long-flow process, the requirements of carbon content in tapping of an oxygen converter and out-of-furnace refining are relaxed, if the semi-steel tapping (1.0-2.0 wt percent C) of the oxygen converter is adopted, so that the deep deoxidation burden of molten steel is reduced, after the thin plate strip is solidified into a thin strip by a thin plate strip continuous casting device, the carbon content is removed to the required level through gas-solid reaction, and the obtained thin strip is rolled and annealed. The carbon content of the converter tapping can be greatly broadened, the converter and refining burden is effectively reduced, the dosage of the deoxidizer is reduced, the smelting time is shortened, the problems of nozzle nodulation and the like caused by deoxidation products are solved, and the cleanliness of steel is greatly improved.
(4) The method adopts the molten metal to directly solidify into the thin strip, can obviously reduce the pouring temperature, effectively avoids the development of a columnar crystal region, provides a larger crystallization speed and a lower solute diffusion rate, inhibits element segregation, and can also greatly reduce the loss of alloy elements caused by high-temperature gasification.
(5) The invention is expected to improve the problems of production cost, cleanliness, macro segregation of elements and the like of the steel for the automobile (mainly aiming at the structural parts of the automobile body). The method avoids or reduces links such as high-strength oxygen blowing, aluminum alloy deoxidation and the like in the decarburization process, can effectively avoid the generation of inclusions and gas and the consumption of a deoxidizer, greatly improves the cleanliness of steel, shortens the smelting process and reduces the production cost.
The temperature of molten iron is far lower than that of molten steel, so that the casting temperature is obviously reduced, and the burning loss of alloy materials can be greatly reduced by directly solidifying and forming after the molten iron is alloyed.
The molten metal is directly solidified by thin strip continuous casting equipment such as double-roller continuous casting equipment, so that the crystallization speed can be increased, the migration rate of solute elements can be reduced, the segregation phenomenon in the solidification process can be improved, the development of columnar crystals can be effectively inhibited, and the development of central equiaxial crystals can be promoted.
The formation of iron scale can be effectively reduced due to the high carbon content of the thin strip, the surface quality is improved, and the method has important significance for saving energy consumption investment, shortening smelting process, reducing production cost and protecting environment.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic view of the apparatus of the present invention;
fig. 3 is a schematic drawing of a tensile specimen.
Reference numerals:
1-a ladle; 2-molten metal; 3-twin roll continuous casting equipment; 4-an electromagnetic induction heating device; 5-a controlled atmosphere decarburization furnace.
Detailed Description
A process for producing high manganese steel sheet strip is described in further detail below with reference to specific examples, which are provided for purposes of comparison and explanation only and to which the present invention is not limited.
A process for producing medium and high manganese steel plate strips is shown in figure 1 and comprises the following steps:
step 1, directly and continuously casting molten metal to form a thin strip of 2-4 mm;
step 2, heating the thin strip to 1413K-1420K;
the temperature in the controlled atmosphere decarburization furnace is 1413K to 1420K, the controlled atmosphere decarburization furnace is internally provided with a decarburization atmosphere, and the decarburization atmosphere comprises Ar-H2-H2O, the pressure in the controlled atmosphere decarburization furnace is 0.2-1 MPa, PH2O/PH2Controlling the temperature to be 0.30-0.55;
and 5, rolling the thin strip and then carrying out heat treatment to obtain the medium-high manganese steel plate strip.
The process for producing the medium-high manganese steel strip adopts a solid decarburization process for the thin strip, avoids or reduces links such as high-strength oxygen blowing, aluminum alloy deoxidation and the like in the decarburization process, can effectively avoid the generation of inclusions and gas and the consumption of a deoxidizer, greatly improves the cleanliness of steel, shortens the smelting process and reduces the production cost.
According to the invention, the molten metal is directly cast into the thin strip, and the molten metal is directly solidified by utilizing thin strip continuous casting equipment such as double-roller continuous casting equipment and the like, so that a larger crystallization speed can be provided, the migration rate of solute elements is reduced, the segregation phenomenon in the solidification process is favorably improved, meanwhile, the development of columnar crystals can be effectively inhibited, and the development of central equiaxial crystals is promoted; the formation of iron scale can be effectively reduced due to the high carbon content of the thin strip, the surface quality is improved, and the method has important significance for saving energy consumption investment, shortening smelting process, reducing production cost and protecting environment.
In one embodiment, the molten metal in step 1 is molten iron obtained by performing smelting reduction on raw materials (such as iron ore) in a blast furnace or a non-blast furnace, performing desulphurization, desiliconization and dephosphorization pretreatment, and adjusting alloy components to a required content, wherein the content of C in the molten iron is 3 wt% to 3.8 wt%. The embodiment can shorten the process flow by directly casting the molten iron into the thin strip through the pretreatment. The temperature of molten iron is far lower than that of molten steel, so that the casting temperature is obviously reduced, and the burning loss of alloy materials can be greatly reduced by directly solidifying and forming after the molten metal is alloyed.
In another embodiment, the molten metal in step 1 is molten metal obtained by subjecting a raw material (such as iron ore) to blast furnace or non-blast furnace smelting reduction, desulfurization, desiliconization and dephosphorization pretreatment, blowing semi-steel out of a converter, partially decarbonizing, refining outside the converter, and adjusting the alloy composition to a desired content (the content of C in the molten metal is 1 wt% to 2 wt%). In the embodiment, the existing process is combined, semi-steel is blown and tapped by the converter, and the semi-steel is cast into a thin strip after partial decarburization, so that the subsequent solid decarburization is carried out, the decarburization task of the converter can be reduced, and the decarburization time can be shortened.
In step 1, molten metal is directly cast into a thin strip, and a thin strip caster may employ a twin roll casting apparatus 3, for example. The continuous casting process parameters are as follows: the cooling intensity is 4500-5500W/(m)2K); the blank drawing speed is 2-4 m/min; the casting temperature is 1670-1800K. If the drawing speed is too high, surface cracks may be caused, and if the drawing speed is too low, the production efficiency is affected.
In the step 2, the thin strip is heated to 1413K-1420K, an exemplary heating device can adopt an electromagnetic induction heating device for heating, the electromagnetic induction heating device is high in heating speed, and the preparation process time can be saved.
Preferably, the heating apparatus may be purged with a reducing atmosphere Ar-H2，H2The volume content is 2-5%, and the thin strip is prevented from being oxidized in the heating process.
In step 3, the decarburization atmosphere has Ar-H composition2-H2O, water supply of oxygen for decarburizationThe water oxidizes iron on the surface of the strip to form iron scale, and H in the decarburization atmosphere2Can inhibit metal oxidation, prevent the formation of iron sheet on the surface of the thin strip, and make the solid decarburization smoothly carried out.
In the solid decarburization process of the medium-high manganese steel strip, an oxide film is formed on the surface of the thin strip by Mn element to hinder the decarburization reaction, the reaction temperature and atmosphere are strictly controlled, so that C is oxidized but Mn and Fe are not oxidized, and under the process condition of the invention, the oxygen potential of Mn oxide is less than or equal to 10%, and the decarburization is not influenced. The temperature in the controlled atmosphere decarburization furnace is 1413K to 1420K, PH2O/PH2The temperature is controlled to be 0.30-0.55. PH2O/PH2Too high ratio will cause FeO and MnO to be formed on the surface of the thin strip2When the ratio of the metal oxides is too low, C in the thin strip cannot be removed; the higher the decarburization temperature is, the faster the decarburization rate is, but too high a decarburization temperature causes deformation of the thin strip and too low a decarburization temperature even if P isH2O/PH2At higher ratios, carbon removal by oxidation is also rendered impossible.
In the step 3, the heating process of the controllable atmosphere decarburization furnace to the target temperature is as follows: firstly, Ar-H is introduced into a controlled atmosphere decarburization furnace2Mixed gas (preferably, Ar-H)2H in the mixed gas2The volume content is controlled to be 9-20 percent), the temperature of the controlled atmosphere decarburization furnace is controlled to rise, and Ar-H is added when the temperature in the controlled atmosphere decarburization furnace rises to 1413K-1420K2The gas path of the mixed gas is switched to Ar-H2The mixed gas firstly passes through a water bath box before being introduced into the controlled atmosphere decarburization furnace, a certain amount of water vapor is taken out and enters the controlled atmosphere decarburization furnace to form Ar-H2-H2A decarburizing atmosphere of O; the decarbonization atmosphere passes through the decarbonization furnace with a controlled atmosphere at a certain flow rate. Preferably, the gas flow rate of the decarburization atmosphere is 500 to 600 mL/min.
In order to prevent the steam from condensing and flowing back, it is preferable that a gas heating device is provided in the gas line for carrying the decarburization atmosphere, and the decarburization atmosphere of the discharged steam is heated.
In step 4, rolling the thin strip as follows: the method comprises the steps of conveying a thin strip to a rolling mill through a supporting roller, carrying out multi-pass hot rolling at the beginning rolling temperature of 1000-1400K and the final rolling temperature of not less than 900K, wherein the final thickness of the hot rolling is 1.0-3 mm, cooling to room temperature after the hot rolling, removing surface oxide skin through acid washing, and carrying out multi-pass rolling on the thin strip in a cold rolling mill to obtain a plate strip with the thickness of 0.5-1.5 mm. Illustratively, the multi-pass hot rolling is 4 passes.
In the step 5, the heat treatment is to perform annealing treatment on the plate and strip obtained after cold rolling in a two-phase region, wherein the annealing temperature is 823-1023K, and the annealing time is 0.5-5 h.
In the medium manganese steel, the content of C is generally 0.05-0.5 wt%, and the content of Mn is 5-12 wt%; in the high manganese steel, the content of C is 0.6-1.5 wt%, and the content of Mn is 15-25 wt%. The invention removes carbon from the thin iron strip to a desired level in the form of a gas-solid reaction. The carbon content of the obtained medium/high manganese steel thin strip can be reduced to below 0.1 wt% at least through detection, manganese in the thin strip is basically not oxidized, the Mn content can be controlled to be 5 wt% -25 wt% according to component requirements, and the component control range of the advanced high-strength steel for automobiles is met. The preparation method of the advanced high-strength steel plate strip for the automobile provided by the application omits the process nodes of converter decarburization, external refining, plate strip continuous casting, heating, hot rolling and the like in the traditional thin strip production process flow in the process. Because the content of dissolved oxygen in the solid state is extremely low, the method omits or reduces high-strength oxygen blowing, and simultaneously adopts high-carbon molten metal to be directly solidified and formed, thereby avoiding oxide inclusion and bubble formation to the maximum extent.
The invention also provides a device for producing the high manganese steel plate strip, which comprises a ladle 1, a thin plate strip continuous casting machine, a heating device 4, a controlled atmosphere decarburization furnace 5, a rolling mill and a gas supply device, as shown in figure 2;
the ladle 1 is used for directly pouring the molten metal 2 to a thin plate strip continuous casting machine to be solidified into a thin strip; the heating device 4 is arranged between the thin plate strip continuous casting machine and the controllable atmosphere decarburization furnace 5 and is used for heating the solidified thin strip; the two ends of the controlled atmosphere decarburization furnace 5 are respectively provided with an air inlet and an air outlet which are used for ensuring that the decarburization atmosphere passes through the controlled atmosphere decarburization furnace 5 at a certain flow rate; the gas supply device is connected with the gas inlet and is used for providing a decarburization atmosphere for the controlled atmosphere decarburization furnace 5; the rolling mill is used for rolling the thin strip subjected to decarburization.
Preferably, the controlled atmosphere decarburization furnace 5 is internally provided with a support roller for supporting the thin strip so that the decarburization atmosphere passes through the upper and lower surfaces of the thin strip.
Further, the gas supply device may be further connected to the heating device for providing a reducing atmosphere to the heating device.
For the detection of the thin strip after decarburization, the scanning electron microscope is used for observing the carbon element distribution of the thin strip section, the X-ray energy spectrometer is used for phase detection, and the CS800 is used for average carbon content detection. The carbon content of the obtained medium/high manganese steel thin strip can be reduced to below 0.1 wt% at least through detection, and manganese in the thin strip is basically not oxidized.
And (5) detecting the mechanical property. The mechanical property detection adopts a CMT5305 type microcomputer control electronic universal tester to carry out room temperature tensile property test (according to a QB/T228-2002 metal material room temperature tensile test method), the test sample processing dimension is shown in figure 3, the tensile rate is 2mm/min, and before the test, 240#, 600#, 1200# sandpaper are respectively used for grinding the clamping end and the gauge length section of the test sample, so that the premature fracture caused by the stress concentration of the sample during the tensile process is prevented.
The yield strength of the medium-high manganese steel plate strip prepared by the process can reach more than 700MPa, the tensile strength can reach 1000-1200 MPa, and the total elongation can reach more than 40%. The yield strength can reach 820MPa, the tensile strength can reach 1200MPa, the total elongation can reach 50%, and the strength-elongation product can reach more than 60% GPa.
Example 1
A preparation process of a medium manganese steel plate strip comprises the steps of producing molten iron by a blast furnace, then carrying out desulfurization, desiliconization and dephosphorization pretreatment, wherein the carbon content is 3.5 wt% after the pretreatment, adding ferromanganese to adjust the alloy components of a metal liquid to the required requirements (if the manganese component is adjusted to 6 wt%), and obtaining the required metal liquid.
Step 1, directly pouring molten metal to a double-roller continuous casting device 3 through a molten metal ladle to solidify the molten metal into a thin strip with the thickness of 3mm, and cooling the thin strip with the strength: 5000W/(m)2K); pulling deviceThe blank speed is 2 m/min; the casting temperature is 1700K.
Step 2, heating the thin plate strip to 1415K through electromagnetic induction heating, and introducing reducing atmosphere Ar-H into the electromagnetic induction heating device2，H2The content of (b) is 2% by volume.
And 4, conveying the thin strip to a rolling mill through a supporting roller, carrying out 4-pass hot rolling at the beginning rolling temperature of 1200K and the final rolling temperature of not less than 900K, carrying out hot rolling at the final thickness of 2mm, cooling the hot rolled plate to room temperature, removing surface oxide skin through acid washing, rolling the plate and strip with the thickness of 1.5mm through 3 passes in a cold rolling mill, and then carrying out two-phase zone annealing treatment at the annealing temperature of 923K for 3 hours.
Example 2
In the embodiment, the existing traditional converter steelmaking process flow is combined, converter tapping is widened, converter semi-steel tapping is adopted, and converter blowing time is shortened (for example, 120t converter smelting time is shortened from 40min to 15-25 min).
A preparation process of a medium manganese steel plate strip comprises the steps of producing molten iron by non-blast furnace smelting reduction, then carrying out desulfurization, desilicification and dephosphorization pretreatment, wherein the carbon content is 3.5 wt% after the pretreatment, then carrying out converter blowing, carrying out partial decarburization, tapping semi-steel, refining outside a furnace, and adjusting alloy components to the required requirements to obtain the required molten metal (the carbon content is 1.5 wt% and the manganese component is adjusted to 20 wt%).
Step 1, directly pouring molten metal to a double-roller continuous casting device 3 through a molten metal ladle to solidify the molten metal into a thin strip with the thickness of 2mm, and cooling the thin strip with the strength: 4900W/(m)2K); the blank drawing speed is 3 m/min; the casting temperature is 1670K.
Step 2, heating the thin plate strip to 1418K rapidly by electromagnetic induction heating, and introducing reducing atmosphere into the electromagnetic induction heating deviceAr-H2，H2The content of (b) is 3% by volume.
And 4, conveying the thin strip to a rolling mill through a supporting roller, carrying out 3-pass hot rolling at the beginning temperature of 1100K and the final temperature of not less than 900K, carrying out hot rolling to the final thickness of 1.5mm, cooling the hot rolled plate to room temperature, removing surface oxide skin through acid washing, rolling the plate and strip into a plate and strip with the thickness of 1mm through 4 passes in a cold rolling mill, and then carrying out two-phase zone annealing treatment at the annealing temperature of 873K for 3 hours.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The process for producing the medium-high manganese steel plate strip is characterized by comprising the following steps of:
step 1, directly and continuously casting molten metal to form a thin strip of 2-4 mm;
step 2, heating the thin strip to 1413K-1420K;
step 3, feeding the heated thin strip into a controlled atmosphere decarburization furnace for solid decarburization;
the temperature in the controlled atmosphere decarburization furnace is 1413K to 1420K, the controlled atmosphere decarburization furnace is internally provided with a decarburization atmosphere, and the decarburization atmosphere comprises Ar-H2-H2O, the pressure in the controlled atmosphere decarburization furnace is 0.2-1 MPa, PH2O/PH2Controlling the temperature to be 0.30-0.55;
step 4, rolling the thin strip after the decarburization is finished;
and 5, rolling the thin strip and then carrying out heat treatment to obtain the medium-high manganese steel plate strip.
2. The process for producing the high-manganese steel plate strip as claimed in claim 1, wherein in the step 4, the thin strip is rolled into the following steps: the method comprises the steps of conveying the thin strip to a rolling mill through a supporting roller, carrying out multi-pass hot rolling at the beginning temperature of 1000-1400K and the final rolling temperature of not less than 900K and the final thickness of 1.0-3 mm, cooling to room temperature after hot rolling, carrying out acid pickling to remove surface oxide skin, and carrying out multi-pass rolling on the thin strip in a cold rolling mill to obtain a plate strip with the thickness of 0.5-1.5 mm.
3. The process for producing the high-manganese steel plate strip according to claim 2, wherein in the step 5, the heat treatment is to perform annealing treatment on the plate strip obtained after the cold rolling in a two-phase region, the annealing temperature is 823-1023K, and the annealing time is 0.5-5 h.
4. The process for producing the high-manganese steel plate strip as claimed in claim 1, wherein in the step 3, the controlled atmosphere decarburization furnace is heated to 1413K-1420K:
firstly, Ar-H is introduced into a controlled atmosphere decarburization furnace2Mixing the gases, controlling the temperature of the controlled atmosphere decarburization furnace to rise, and after the temperature in the controlled atmosphere decarburization furnace rises to 1413K-1420K, Ar-H is added2The gas path of the mixed gas is switched to Ar-H2The mixed gas firstly passes through a water bath box before being introduced into the controlled atmosphere decarburization furnace, and a certain amount of water vapor is taken out and enters the controlled atmosphere decarburization furnace to form a decarburization atmosphere;
the decarbonization atmosphere passes through a controllable atmosphere decarbonization furnace at a certain flow rate.
5. The process for producing the medium-high manganese steel plate strip according to the claims 1 to 4, wherein in the step 3, the gas flow of the decarburization atmosphere is 500-600 mL/min.
6. In the production according to any one of claims 1 to 4The process of the high manganese steel plate strip is characterized in that Ar-H2H in the mixed gas2The content is controlled to be 9-20% by volume fraction.
7. The process for producing the high-manganese steel plate strip according to claim 1, wherein in the step 1, the molten metal is prepared by performing melting reduction on raw materials in a blast furnace or a non-blast furnace, performing desulfurization, desilicication and dephosphorization pretreatment, and adjusting alloy components to required contents;
the content of C in the molten metal is 3.0-3.8 wt%.
8. The process for producing the medium-high manganese steel plate strip according to claim 1, wherein in the step 1, the molten metal is prepared by performing blast furnace or non-blast furnace smelting reduction on raw materials, performing desulfurization, desiliconization and dephosphorization pretreatment, blowing semisteel into a converter for tapping, partially decarburizing, performing external refining, and adjusting alloy components to required content;
the content of the molten metal C is 1-2 wt%.
9. An apparatus for use in the process of manufacturing a high manganese steel strip according to any one of claims 1 to 8, comprising a ladle, a continuous thin strip caster, a heating apparatus, a controlled atmosphere decarburization furnace, a rolling mill and a gas supply apparatus;
the ladle is used for directly pouring molten metal to the thin plate strip continuous casting machine to be solidified into a thin strip;
the heating device is arranged between the thin plate strip continuous casting machine and the controllable atmosphere decarburization furnace and is used for heating the solidified thin strip;
the two ends of the controllable atmosphere decarburization furnace are respectively provided with an air inlet and an air outlet which are used for ensuring that the decarburization atmosphere passes through the controllable atmosphere decarburization furnace at a certain flow rate;
the gas supply device is connected with the gas inlet and is used for providing a decarburization atmosphere for the controlled atmosphere decarburization furnace;
the rolling mill is used for rolling the thin strip subjected to decarburization.
10. The apparatus of claim 9, wherein the controlled atmosphere decarburization furnace is provided with support rolls inside, the support rolls being adapted to support the thin strip so that the decarburization atmosphere passes through both the upper and lower surfaces of the thin strip.
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Application publication date: 20210205 Assignee: TANGSHAN ANODE AUTOAMTION Co.,Ltd. Assignor: NORTH CHINA University OF SCIENCE AND TECHNOLOGY Contract record no.: X2023980043370 Denomination of invention: A Process and Device for Producing Medium and High Manganese Steel Plate and Strip Granted publication date: 20220712 License type: Common License Record date: 20231013 |
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