CN113355590A - Three-layer composite structure high-strength steel plate and manufacturing method thereof - Google Patents
Three-layer composite structure high-strength steel plate and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 221
- 239000010959 steel Substances 0.000 title claims abstract description 221
- 239000002131 composite material Substances 0.000 title claims abstract description 111
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- 239000010410 layer Substances 0.000 claims abstract description 145
- 239000002344 surface layer Substances 0.000 claims abstract description 80
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 20
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 8
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 5
- 239000012792 core layer Substances 0.000 claims abstract description 3
- 238000000137 annealing Methods 0.000 claims description 75
- 238000000034 method Methods 0.000 claims description 53
- 238000001816 cooling Methods 0.000 claims description 47
- 238000005261 decarburization Methods 0.000 claims description 33
- 238000004321 preservation Methods 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 28
- 238000005262 decarbonization Methods 0.000 claims description 21
- 230000035484 reaction time Effects 0.000 claims description 20
- 238000005098 hot rolling Methods 0.000 claims description 17
- 238000009749 continuous casting Methods 0.000 claims description 15
- 238000009628 steelmaking Methods 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 229910052729 chemical element Inorganic materials 0.000 claims description 7
- 239000010960 cold rolled steel Substances 0.000 claims description 7
- 238000005097 cold rolling Methods 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910001566 austenite Inorganic materials 0.000 claims description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 abstract description 8
- 230000002349 favourable effect Effects 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 239000011572 manganese Substances 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 238000013329 compounding Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
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- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000002905 metal composite material Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000008014 freezing Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
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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
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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
- C21D8/0221—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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
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- 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses a three-layer composite structure high-strength steel plate which is provided with an upper surface layer, a lower surface layer and a central layer positioned between the upper surface layer and the lower surface layer in the thickness direction of the steel plate; wherein the microstructures of the upper surface layer and the lower surface layer are a complete ferrite structure or a structure with a ferrite phase ratio > 50%; the microstructure of the core layer includes at least one of martensite and bainite; wherein the ferrite content of the center layer is less than the ferrite content of the upper and lower surface layers. In addition, the invention also discloses a manufacturing method of the three-layer composite structure high-strength steel plate. The three-layer composite structure high-strength steel plate has the characteristics of soft surface and hard inside, the low-hardness structure of the surface layer is shaped and has good toughness, and the high-strength structure of the inner layer is favorable for ensuring high strength, so that the formability and the toughness of the ultrahigh-strength steel are improved by a simple means.
Description
Technical Field
The present invention relates to a steel sheet and a method for manufacturing the same, and more particularly, to a high-strength steel sheet and a method for manufacturing the same.
Background
With the development of the automobile manufacturing industry, energy saving and safety become the main development direction of the automobile manufacturing industry. In the automobile industry, due to the requirements of weight reduction and safety, a steel plate with higher strength is required to be used, but the plasticity, toughness and formability of the high-strength steel are reduced along with the increase of the strength, and the application of the high-strength steel is restricted by the contradictory performance relations. The layered composite steel sheet is an effective attempt to solve this problem, and can compensate for the decrease in formability and toughness caused by the increase in strength of the steel sheet to some extent. The layered composite structure is a multi-layered steel sheet having a structure, strength, and hardness layers that are significantly different from each other in the thickness direction of the steel sheet. The rolling composite technology is a traditional technology for manufacturing the laminated composite tissue steel plate.
At present, in the prior art, three or more groups of steel plates with different components and tissues are generally adopted in a multi-layer composite structure cold-rolled steel plate, three or more layers of steel plates with different tissues are obtained in a rolling and compounding mode, the process of the rolling and compounding process is complex, interface cleaning is needed, the three layers of steel plates are required to be processed into specific thicknesses respectively and then are rolled and compounded, the cost is high, and the defect of poor combination of steel plate interfaces is easy to occur.
For example: chinese patent publication No. CN102015423B, published as 2014 10 and 01, entitled "application of metal composite material in motor vehicle structure", discloses a coilable multilayer metal composite material produced by a roll method, which can be effectively used for vehicle body structures. The composite material is a composite steel plate with three layers of different structures, wherein at least one layer is high-strength or very high-strength alloy steel. However, the rolling and compounding process is complex in process and high in cost, and the defect of poor combination at the interface of the steel plate can occur.
Another example is: japanese patent publication No. 7-275938, published as 10/24/1995 entitled "composite high-strength steel sheet having excellent shape freezing properties", discloses a composite high-strength steel sheet having a surface layer of 500-400 MPa high-strength steel and an interior portion of 250-400MPa low-strength steel, which is advantageous for improving springback. The composite steel plate is manufactured by rolling and compounding. But the cost of the invention is slightly higher.
Disclosure of Invention
The invention aims to provide a three-layer composite structure high-strength steel plate, the three-layer composite structure high-strength steel plate has three different structure areas from top to bottom, and the high-strength steel plate has the characteristics of soft surface, hard inside and the like through reasonable distribution of different structures. The shaping and the toughness of the surface layer low-hardness structure of the steel plate are good, the inner layer high-strength structure is favorable for ensuring high strength, and the formability and the toughness of the ultrahigh-strength steel are effectively improved.
In order to achieve the above object, the present invention provides a three-layer composite structure high-strength steel sheet having an upper surface layer, a lower surface layer, and a center layer located between the upper surface layer and the lower surface layer in a thickness direction of the steel sheet; wherein the microstructures of the upper surface layer and the lower surface layer are a complete ferrite structure or a structure with a ferrite phase ratio > 50%; the microstructure of the core layer includes at least one of martensite and bainite; wherein the ferrite content of the center layer is less than the ferrite content of the upper and lower surface layers.
In the technical scheme of the invention, the steel plate has three layers of different structure areas from top to bottom, and the different areas have different strengths. The reasonable distribution of different structures ensures that the high-strength steel plate has the characteristics of soft surface and hard inside, and also has high strength and excellent formability. The method can be used for manufacturing automobile safety parts and structural parts, improves the bending formability of the high-strength steel plate and the deformation energy-absorbing performance of the manufactured parts, and is favorable for the safety protection of the manufactured parts.
Further, in the three-layer composite structure high-strength steel sheet of the present invention, the microstructure of the center layer further includes: at least one of ferrite, carbide and metastable austenite with a phase ratio of less than 50%.
Further, in the three-layer composite structure high-strength steel sheet according to the present invention, the ferrite structures of the upper surface layer and the lower surface layer further contain carbide.
Further, in the three-layer composite structure high-strength steel plate of the invention, the three-layer composite structure high-strength steel plate is a cold-rolled steel plate, and the thickness of the steel plate is 0.5-2.5 mm.
Further, in the three-layer composite structure high-strength steel plate, the three-layer composite structure high-strength steel plate is a hot-rolled steel plate, and the thickness of the steel plate is 1.0-3.0 mm.
Further, in the three-layer composite structure high-strength steel plate, the thickness of the upper surface layer is 5-100 micrometers; and/or the thickness of the lower skin layer is 5-100 microns.
Further, the thickness of the upper surface layer is more than 100 microns; and/or the lower skin layer has a thickness greater than 100 microns.
In order to ensure that the ultrahigh-strength steel has high strength and good formability and toughness. The reasonable design of each chemical element is needed, so that the obtained three-layer composite structure high-strength steel plate has excellent performance.
Further, the three-layer composite structure high-strength steel plate of the invention contains the following chemical elements: c: 0.08-0.35%; si: 0.01 to 2.5 percent; mn: 0.5 to 3.0 percent.
Further, in the three-layer composite structure high-strength steel plate of the invention, the mass percentages of the chemical elements are as follows: c: 0.08-0.35%; si: 0.01 to 2.5 percent; mn: 0.5 to 3.0 percent; the balance being Fe and other unavoidable impurities.
In the three-layer composite structure high-strength steel plate, the design principle of each chemical element is as follows:
c: in the three-layer composite structure high-strength steel sheet of the present invention, C can improve the strength of the steel by affecting the martensitic hardness. If the carbon content in the steel is too low, the strength of the quenched steel is low, the formability and the toughness are good, and the function of the layered composite structure is not obvious; the higher the carbon content in the steel, the higher the strength of the quenched steel, and the more obvious the function of the layered structure in the steel of the invention. Compared with the common ultrahigh-strength steel with the tensile strength of 980MPa or above, the invention has obvious effect. Therefore, in the three-layer composite structure high-strength steel plate, the mass percent of C is controlled to be 0.08-0.35%, so that the high-strength steel plate with the tensile strength of over 980MPa can be obtained after quenching, and excellent performance improvement can be obtained.
Si: in the three-layer composite structure high-strength steel plate, Si is a common element in the phase-change reinforced ultrahigh-strength steel, can play a role in solid solution reinforcement, change of a phase-change kinetic curve and change of a structure type, and can be effectively used for improving the performance of various advanced high-strength steels. Therefore, similar to the addition amount of Si in common high-strength steel, in the three-layer composite structure high-strength steel plate of the invention, the mass percent of Si is controlled to be between 0.01 and 2.5 percent.
Mn: in the three-layer composite structure high-strength steel plate, Mn is a main element for improving the hardenability of the steel, the content of Mn needs to be matched with the cooling capacity of a selected cooling mode, when the content of Mn is too low, the steel plate cannot be hardened, so that higher strength cannot be obtained, and if the content of Mn is too high, the steel plate is unfavorable for carbon equivalent. Therefore, the performance improvement effect and the adverse effect of Mn on the three-layer composite structure high-strength steel plate are comprehensively considered, and the mass percent of Mn in the three-layer composite structure high-strength steel plate is controlled to be 0.5-3.0%.
Further, the three-layer composite structure high-strength steel sheet according to the present invention further contains at least one of Cr, Mo, and B; wherein, when B is less than 0.0005%, Cr + Mn + Mo is less than or equal to 3%; when B is 0.0005-0.0035%, Cr + Mn + Mo is less than or equal to 2.3%. Wherein Cr, Mn and Mo all represent the mass percentage content.
In the three-layer composite structure high-strength steel plate, a proper amount of alloy elements such as Cr, Mo and B can be effectively matched with manganese, so that the hardenability is improved, the hardenability of the steel is matched with the cooling capacity of a rapid cooling section, and the condition that the steel cannot be hardened or the carbon equivalent is too high is avoided.
Furthermore, the three-layer composite structure high-strength steel plate also contains at least one of V, Ti and Nb, and the V + Ti + Nb is less than or equal to 0.15 percent. In the formula, V, Ti and Nb all represent the mass percentage content.
Furthermore, in the three-layer composite structure high-strength steel plate, the overall tensile strength of the three-layer composite structure high-strength steel plate is 980-1700MPa, the microhardness HV of the upper surface layer and the lower surface layer is less than or equal to 250, and the microhardness HV of the middle layer is more than or equal to 270.
Accordingly, another object of the present invention is to provide a method for manufacturing a three-layer composite structure high-strength steel plate, the three-layer composite structure high-strength steel plate obtained by the method has three different structure regions from top to bottom, the surface layer low-hardness structure has good shaping and toughness, the inner layer high-strength structure is beneficial to ensuring high strength, and the formability and toughness of the ultra-high-strength steel are improved.
In order to achieve the above object, the present invention provides a method for manufacturing a three-layer composite structure high-strength steel sheet, when the three-layer composite structure high-strength steel sheet is a hot-rolled steel sheet, comprising the steps of: steel making, continuous casting, hot rolling, acid washing and continuous annealing; wherein high-temperature humidification decarburization is carried out in a continuous annealing step: and under the condition that the temperature of the steel plate is 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of 5-100 micrometers (namely, the upper surface layer and the lower surface layer are both decarburized layers).
In the method for manufacturing the three-layer composite structure high-strength steel plate, the steel is subjected to steelmaking and continuous casting to prepare the steel plate with uniform components and structures, the steel plate is subjected to hot rolling and acid pickling, the temperature of the steel plate is controlled to be 750-900 ℃ in the high-temperature heating and heat preservation stage of a continuous annealing furnace, the content of water vapor in the annealing furnace is increased by utilizing a method of humidifying in the furnace, the dew point in the furnace is controlled to be-15 to +15 ℃, the holding time is controlled to be 40-160s, and the water vapor and carbon in the steel plate are subjected to decarburization reaction at high temperature (such as a reaction formula: C + H)2O＝CO+H2；C+2H2O＝CO2+2H2And others not limited thereto) to partially or completely decarburize the surface layer of the steel sheet, and finally, decarburize layers of 5 to 100 μm in depth on the upper and lower surface layers of the steel sheet can be obtained. Therefore, in the subsequent cooling process of the steel plate, the decarburized layer on the surface is kept in a structure form mainly comprising full ferrite or ferrite, and the non-decarburized area in the center is rapidly cooled to form a structure mainly comprising martensite, bainite or martensite and bainite. The ferrite content of the core structure is obviously lower than that of the surface, and the obtained three-layer composite structure high-strength steel plate has the characteristics of high strength and low surface hardness.
In addition, the reason for selecting the steel plate temperature of 750-900 ℃ is favorable for the decarburization reaction of the steel plate, the decarburization is insufficient due to the excessively low steel plate temperature, and the plate shape is affected due to the excessively high steel plate temperature. The reason for choosing the dew point in the furnace between-15 and +15 ℃ is that the steel plate has an insignificant decarburization reaction when the dew point is lower than-15 ℃ and a risk of excessive oxidation of Fe when the dew point is higher than +15 ℃.
Further, in the method for manufacturing a three-layer composite structure high-strength steel plate according to the present invention, the parameters of the continuous annealing process are controlled to at least satisfy at least one of the following conditions in the continuous annealing step:
controlling the heat preservation temperature to be 780-900 ℃ and the heat preservation time to be 40-160 s;
the rapid cooling starting temperature is 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃;
the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
Further, in the method for manufacturing a three-layer composite structure high-strength steel sheet according to the present invention, when the three-layer composite structure high-strength steel sheet is a hot-rolled steel sheet, it includes the steps of: steel making, continuous casting, hot rolling, acid washing, decarbonizing in a high-temperature humidifying decarbonizing furnace and continuous annealing; wherein in the decarbonization process of the high-temperature humidifying decarbonization furnace, the dew point in the annealing furnace is controlled to be-15 ℃ under the condition that the temperature of the steel plate is 750-900 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of 5-100 microns.
According to the technical scheme, the steel is subjected to hot rolling, acid washing and then subjected to a decarburization process in an independent high-temperature humidifying decarburization furnace, the content of water vapor in the furnace is increased by controlling the temperature of a steel plate to be 750-900 ℃ and utilizing a method of humidifying in the furnace, the dew point in the furnace is controlled to be between-15 ℃ and +15 ℃, and the holding time is controlled to be 40-160 s. Humidifying at high temperature to realize decarbonization reaction of water vapor and carbon in the steel plate at high temperature, thereby decarbonizing the surface of the steel plate. After the decarburization in the high-temperature-humidification decarburization furnace is completed, the decarburization in the continuous annealing furnace is optionally performed without humidification, so that the thickness of the decarburized layer formed on the upper surface layer and the lower surface layer of the steel sheet is maintained at 5 to 100 μm.
Further, in the manufacturing method of the three-layer composite structure high-strength steel plate, the parameters of the continuous annealing process are controlled in the continuous annealing step to at least meet at least one of the following conditions:
controlling the heat preservation temperature to be 780-900 ℃ and the heat preservation time to be 40-160 s;
the rapid cooling starting temperature is 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃;
the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
Further, in the above method for producing a three-layer composite structure high-strength steel sheet, wherein the high-temperature humidification decarburization is continued in the continuous annealing step: and under the condition that the temperature of the steel plate is 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of more than 100 micrometers.
According to the technical scheme, after the steel is subjected to hot rolling and pickling, high-temperature humidification and decarburization are carried out in an independent high-temperature humidification and decarburization furnace, high-temperature humidification and decarburization can be carried out again in a continuous annealing step, and a thicker decarburized layer is obtained by adopting secondary humidification and decarburization, so that the upper surface layer and the lower surface layer of the steel plate are decarburized layers with the thickness of more than 100 micrometers respectively.
Further, in the method for manufacturing a three-layer composite structure high-strength steel sheet according to the present invention, when the three-layer composite structure high-strength steel sheet is a cold-rolled steel sheet, it includes the steps of: steel making, continuous casting, hot rolling, cold rolling and continuous annealing; wherein high-temperature humidification decarburization is carried out in a continuous annealing step: and under the condition that the temperature of the steel plate is 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of 5-100 microns.
Further, in the manufacturing method of the three-layer composite structure high-strength steel plate, the parameters of the continuous annealing process are controlled in the continuous annealing step to at least meet at least one of the following conditions:
controlling the heat preservation temperature to be 780-900 ℃ and the heat preservation time to be 40-160 s;
the rapid cooling starting temperature is 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃;
the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
Further, in the method for manufacturing a three-layer composite structure high-strength steel sheet according to the present invention, when the three-layer composite structure high-strength steel sheet is a cold-rolled steel sheet, it includes the steps of: steel making, continuous casting, hot rolling, cold rolling, decarbonizing in a high-temperature humidifying decarbonizing furnace and continuous annealing; wherein in the decarbonization process of the high-temperature humidifying decarbonization furnace, the dew point in the annealing furnace is controlled to be-15 ℃ under the condition that the temperature of the steel plate is 750-900 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of 5-100 microns.
In the above embodiment, it should be noted that after the decarburization in the high temperature humidification decarburization furnace is completed, the decarburization in the continuous annealing furnace is optionally performed without humidification, so that the thickness of the decarburized layer formed on the upper surface layer and the lower surface layer of the steel sheet is maintained to be 5 to 100 μm.
Further, in the manufacturing method of the three-layer composite structure high-strength steel plate, the parameters of the continuous annealing process are controlled in the continuous annealing step to at least meet at least one of the following conditions:
controlling the heat preservation temperature to be 780-900 ℃ and the heat preservation time to be 40-160 s;
the rapid cooling starting temperature is 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃;
further, in the method for manufacturing a three-layer composite structure high-strength steel sheet of the present invention, high-temperature humidification decarburization is continued in the continuous annealing process: and under the condition that the temperature of the steel plate is 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of more than 100 micrometers.
In the method for manufacturing the three-layer composite structure high-strength steel plate, the key process lies in the control of the humidification and decarburization reaction in the continuous annealing furnace or the independent high-temperature humidification and decarburization furnace, and in a preferred embodiment, the humidification and decarburization can be carried out only in the annealing furnace of the continuous annealing furnace, so that the cost is reduced, and the competitiveness is improved.
Compared with the prior art, the three-layer composite structure high-strength steel plate disclosed by the invention has the characteristics that the high-strength steel plate has three different structure areas from top to bottom through a reasonable decarburization process, and the different structures are reasonably distributed, so that the high-strength steel plate has soft surface and hard inside. The surface layer low-hardness structure of the steel plate is plastic and good in toughness, the high-strength structure of the inner layer ensures the high strength of the steel plate, and the formability and the toughness of the ultrahigh-strength steel are improved. Compared with the traditional method for preparing the multilayer composite steel plate by rolling and compounding, the three-layer composite structure high-strength steel plate has better performance, the integral tensile strength is between 980 and 1700MPa, the microhardness HV of the upper surface layer and the lower surface layer is less than or equal to 250, and the microhardness HV of the middle layer is more than or equal to 270. The method can be used for manufacturing automobile safety parts and structural parts, and improves the bending formability of the high-strength steel plate and the deformation energy-absorbing performance of the manufactured parts, thereby playing a role in facilitating the safety protection of the manufactured parts.
Correspondingly, the manufacturing method of the invention obtains the composite structure steel plate with high strength, high shaping property and good toughness and integral tensile strength of 980-1700MPa by the component design and the process parameter design of the three-layer composite structure high-strength steel plate while reducing the production cost.
Drawings
FIG. 1 shows the microstructure of the three-layer composite structure high-strength steel plate of the present invention in the vicinity of the upper surface of the steel plate in example 4.
FIG. 2 shows the sectional microstructure morphology near the upper surface of the steel sheet in comparative example 1 of the present invention.
Detailed Description
The three-layer composite structure high-strength steel plate and the manufacturing method thereof according to the present invention will be further explained and illustrated with reference to the following specific examples and drawings of the specification, but the explanation and illustration should not be construed as an undue limitation on the technical solution of the present invention.
Examples 1 to 6 and comparative example 1
The three-layer composite structure high-strength steel plate is prepared by the following steps:
(1) steel making: smelting the molten iron by a converter;
(2) continuous casting: continuously casting to obtain a plate blank;
(3) hot rolling;
(4) cold rolling;
(5) and (3) continuous annealing: and (3) carrying out high-temperature humidification and decarburization in continuous annealing, and controlling the dew point in the annealing furnace to be-15 ℃ and the reaction time to be 40-160s under the condition that the temperature of the steel plate is 750-900 ℃. The heat preservation temperature is controlled to be 780-900 ℃ in the continuous annealing, and the heat preservation time is controlled to be 40-160 s; controlling the rapid cooling starting temperature to be 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃; the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
Examples 7 to 8
The three-layer composite structure high-strength steel plate is prepared by the following steps:
(1) steel making: smelting the molten iron by a converter;
(2) continuous casting: continuously casting to obtain a plate blank;
(3) hot rolling;
(4) cold rolling;
(5) decarbonizing in a high-temperature humidifying decarbonizing furnace: in the decarbonization process of the high-temperature humidifying decarbonization furnace, under the condition that the temperature of a steel plate is 750-900 ℃, the dew point in the high-temperature humidifying decarbonization furnace is controlled to be-15 ℃, the reaction time is 40-160s,
(6) and (3) continuous annealing: in the continuous annealing, the heat preservation temperature is controlled to be 780-minus 900 ℃, the dew point in the furnace is controlled to be lower than minus 20 ℃, the heat preservation time is controlled to be 40-160s, the rapid cooling starting temperature is controlled to be 650-minus 780 ℃, the rapid cooling speed is controlled to be 30-1500 ℃/s, the rapid cooling ending temperature is controlled to be 50-450 ℃, the overaging temperature is controlled to be 180-minus 450 ℃, and the overaging time is controlled to be 200-minus 600 s.
Examples 9 to 10
The three-layer composite structure high-strength steel plate is prepared by the following steps:
(1) steel making: smelting the molten iron by a converter;
(2) continuous casting: continuously casting to obtain a plate blank;
(3) hot rolling;
(4) cold rolling;
(5) decarbonizing in a high-temperature humidifying decarbonizing furnace: in the decarbonization process of the high-temperature humidifying decarbonization furnace, under the condition that the temperature of a steel plate is 750-900 ℃, the dew point in the high-temperature humidifying decarbonization furnace is controlled to be-15 ℃, the reaction time is 40-160s,
(6) and (3) continuous annealing: and performing high-temperature humidification and decarburization again in the continuous annealing, wherein the temperature of the steel plate is controlled to be 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160 s. The heat preservation temperature is controlled to be 780-900 ℃ in the continuous annealing, and the heat preservation time is controlled to be 40-160 s; controlling the rapid cooling starting temperature to be 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃; the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
Examples 11 to 12
The three-layer composite structure high-strength steel plate is prepared by the following steps:
(1) steel making: smelting the molten iron by a converter;
(2) continuous casting: continuously casting to obtain a plate blank;
(3) hot rolling;
(4) acid washing;
(5) and (3) continuous annealing: and (3) carrying out high-temperature humidification and decarburization in continuous annealing, and controlling the dew point in the annealing furnace to be-15 ℃ and the reaction time to be 40-160s under the condition that the temperature of the steel plate is 750-900 ℃. In the continuous annealing, the heat preservation temperature is controlled to be 780-minus 900 ℃, the heat preservation time is controlled to be 40-160s, the rapid cooling starting temperature is controlled to be 650-minus 780 ℃, the rapid cooling speed is 30-1500 ℃/s, the rapid cooling termination temperature is 50-450 ℃, the overaging temperature is 180-minus 450 ℃, and the overaging time is 200-minus 600 s.
Examples 13 to 14
The three-layer composite structure high-strength steel plate is prepared by the following steps:
(1) steel making: smelting the molten iron by a converter;
(2) continuous casting: continuously casting to obtain a plate blank;
(3) hot rolling;
(4) acid washing;
(5) decarbonizing in a high-temperature humidifying decarbonizing furnace; in the decarbonization process of the high-temperature humidifying decarbonization furnace, under the condition that the temperature of a steel plate is 750-900 ℃, the dew point in the high-temperature humidifying decarbonization furnace is controlled to be-15 ℃, the reaction time is 40-160s,
(6) and (3) continuous annealing: in the continuous annealing, the heat preservation temperature is controlled to be 780-minus 900 ℃, the dew point in the furnace is controlled to be lower than minus 20 ℃, the heat preservation time is controlled to be 40-160s, the rapid cooling starting temperature is controlled to be 650-minus 780 ℃, the rapid cooling speed is controlled to be 30-1500 ℃/s, the rapid cooling ending temperature is controlled to be 50-450 ℃, the overaging temperature is controlled to be 180-minus 450 ℃, and the overaging time is controlled to be 200-minus 600 s.
Examples 15 to 16
The three-layer composite structure high-strength steel plate is prepared by the following steps:
(1) steel making: smelting the molten iron by a converter;
(2) continuous casting: continuously casting to obtain a plate blank;
(3) hot rolling;
(4) acid washing;
(5) decarbonizing in a high-temperature humidifying decarbonizing furnace; in the decarbonization process of the high-temperature humidifying decarbonization furnace, under the condition that the temperature of a steel plate is 750-900 ℃, the dew point in the high-temperature humidifying decarbonization furnace is controlled to be-15 ℃, the reaction time is 40-160s,
(6) and (3) continuous annealing: and performing high-temperature humidification and decarburization again in the continuous annealing, wherein the temperature of the steel plate is controlled to be 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160 s. In the continuous annealing, the heat preservation temperature is controlled to be 780-minus 900 ℃, the heat preservation time is controlled to be 40-160s, the rapid cooling starting temperature is controlled to be 650-minus 780 ℃, the rapid cooling speed is 30-1500 ℃/s, the rapid cooling termination temperature is 50-450 ℃, the overaging temperature is 180-minus 450 ℃, and the overaging time is 200-minus 600 s.
Table 1 shows the mass percentages of the chemical elements of the steel grades used in the examples of the present invention and the comparative examples.
TABLE 1 (wt%, balance Fe and unavoidable impurities other than S, P, N)
Table 2 shows the specific process parameters of the three-layer composite structure high-strength steel plates of examples 1 to 16 and the steel plate of comparative example 1.
Table 2.
Note: when the continuous annealing is carried out in the annealing furnace, when the dew point of the heat preservation section of the annealing furnace is less than or equal to minus 20 ℃, no obvious decarburization reaction occurs.
Table 3 shows the relevant performance parameters of the three-layer composite structure high-strength steel sheets of examples 1 to 16 and the steel sheet of comparative example 1.
Table 3.
As can be seen from Table 3, compared with comparative example 1 in which the dew point of the heat preservation section is not in the range of-15 to 15 ℃, the hardness of the decarburized layer of the three-layer composite structure high-strength steel plate treated by the manufacturing method of the invention in examples 1 to 6 of the present application is significantly reduced, and the low-hardness structure of the surface layer has good shaping, good toughness and excellent performance. As can be seen from the examples 1-6 in Table 3, the three-layer composite structure high-strength steel plate has soft surface layer and hard inner layer, and can effectively improve the formability and the toughness of the ultrahigh-strength steel. The reasonable distribution of different structures in the steel ensures that the high-strength steel plate has better performance than the traditional multilayer composite steel plate prepared by rolling and compounding, the integral tensile strength is between 985-1700MPa, the microhardness HV of the upper surface layer and the lower surface layer is less than or equal to 150, and the microhardness HV of the middle layer is more than or equal to 310. The high-strength steel plate can be effectively used for manufacturing automobile safety parts and structural parts, and the bending formability of the high-strength steel plate and the deformation energy-absorbing performance of the manufactured parts are improved, so that the safety protection effect of the manufactured parts is facilitated.
FIG. 1 shows the microstructure of the three-layer composite structure high-strength steel sheet of the present invention in the vicinity of the upper surface of the steel sheet in example 4. As can be seen from fig. 1, the high strength steel sheet with a three-layer composite structure in the present example has a decarburized layer with a ferrite structure as the main component on the upper surface layer, and has a significantly different structure morphology from the central layer with a martensite structure as the main component.
FIG. 2 shows the sectional microstructure morphology near the upper surface of the steel sheet in comparative example 1 of the present invention. As can be seen from fig. 2, the conventional structure of the high strength steel sheet of the present comparative example is a martensite structure type having substantially uniform surface layers and central regions, and is clearly different from the layered composite structure of the high strength steel sheet of example 4 of fig. 1.
It should be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.
Claims (22)
1. A three-layer composite structure high-strength steel plate is characterized by comprising an upper surface layer, a lower surface layer and a central layer positioned between the upper surface layer and the lower surface layer in the thickness direction of the steel plate; wherein the microstructures of the upper surface layer and the lower surface layer are a complete ferrite structure or a structure with a ferrite phase ratio > 50%; the microstructure of the core layer includes at least one of martensite and bainite; wherein the ferrite content of the center layer is less than the ferrite content of the upper and lower surface layers.
2. The three-layer composite structure high-strength steel plate as claimed in claim 1, wherein the microstructure of the central layer further comprises: at least one of ferrite, carbide and metastable austenite with a phase ratio of less than 50%.
3. The high-strength steel sheet having a three-layer composite structure according to claim 1, wherein the ferrite structures of the upper surface layer and the lower surface layer further contain carbide.
4. The three-layer composite structure high-strength steel sheet according to claim 1, wherein the three-layer composite structure high-strength steel sheet is a cold-rolled steel sheet having a thickness of 0.5 to 2.5 mm.
5. The three-layer composite structure high-strength steel sheet according to claim 1, wherein the three-layer composite structure high-strength steel sheet is a hot-rolled steel sheet having a thickness of 1.0 to 3.0 mm.
6. The three-layer composite structure high-strength steel plate according to claim 1, wherein the thickness of the upper surface layer is 5 to 100 μm; and/or the thickness of the lower skin layer is 5-100 microns.
7. The three-layer composite structure high-strength steel plate according to claim 1, wherein the thickness of the upper surface layer is more than 100 μm; and/or the lower skin layer has a thickness greater than 100 microns.
8. The three-layer composite structure high-strength steel plate according to claim 1, which contains the following chemical elements: c: 0.08-0.35%; si: 0.01 to 2.5 percent; mn: 0.5 to 3.0 percent.
9. The three-layer composite structure high-strength steel plate as claimed in claim 7, wherein the chemical elements comprise, by mass: c: 0.08-0.35%; si: 0.01 to 2.5 percent; mn: 0.5 to 3.0 percent; the balance being Fe and other unavoidable impurities.
10. The three-layer composite structure high-strength steel sheet according to claim 7 or 8, further comprising at least one of Cr, Mo, and B; wherein, when B is less than 0.0005%, Cr + Mn + Mo is less than or equal to 3%; when B is 0.0005-0.0035%, Cr + Mn + Mo is less than or equal to 2.3%.
11. The three-layer composite structure high-strength steel sheet according to claim 7 or 8, further comprising at least one of V, Ti and Nb, wherein V + Ti + Nb is 0.15% or less.
12. The three-layer composite structure high-strength steel plate as claimed in any one of claims 1 to 10, wherein the overall tensile strength of the three-layer composite structure high-strength steel plate is 980-1700MPa, the microhardness HV of the upper surface layer and the lower surface layer is less than or equal to 250, and the microhardness HV of the middle layer is more than or equal to 270.
13. The method for manufacturing a three-layer composite structure high-strength steel sheet as claimed in any one of claims 1 to 3,5 to 11, wherein when the three-layer composite structure high-strength steel sheet is a hot-rolled steel sheet, it comprises the steps of: steel making, continuous casting, hot rolling, acid washing and continuous annealing; wherein high-temperature humidification decarburization is carried out in a continuous annealing step: and under the condition that the temperature of the steel plate is 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of 5-100 microns.
14. The method for manufacturing a three-layer composite structure high-strength steel plate according to claim 12, wherein the parameters of the continuous annealing process are controlled to at least satisfy at least one of the following conditions in the continuous annealing step:
controlling the heat preservation temperature to be 780-900 ℃ and the heat preservation time to be 40-160 s;
the rapid cooling starting temperature is 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃;
the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
15. The method for manufacturing a three-layer composite structure high-strength steel sheet as claimed in any one of claims 1 to 3,5 to 11, wherein when the three-layer composite structure high-strength steel sheet is a hot-rolled steel sheet, it comprises the steps of: steel making, continuous casting, hot rolling, acid washing, decarbonizing in a high-temperature humidifying decarbonizing furnace and continuous annealing; wherein in the decarbonization process of the high-temperature humidifying decarbonization furnace, the dew point in the annealing furnace is controlled to be-15 ℃ under the condition that the temperature of the steel plate is 750-900 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of 5-100 microns.
16. The method for manufacturing a three-layer composite structure high-strength steel plate according to claim 14, wherein the parameters of the continuous annealing process are controlled in the continuous annealing step to at least satisfy at least one of the following:
controlling the heat preservation temperature to be 780-900 ℃ and the heat preservation time to be 40-160 s;
the rapid cooling starting temperature is 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃;
the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
17. The method of manufacturing a three-layer composite structure high-strength steel sheet as set forth in claim 14, wherein the high-temperature humidification decarburization is continued in the continuous annealing step: and under the condition that the temperature of the steel plate is 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of more than 100 micrometers.
18. The method for manufacturing a three-layer composite structure high-strength steel sheet as claimed in any one of claims 1 to 4,6 to 11, wherein when the three-layer composite structure high-strength steel sheet is a cold-rolled steel sheet, it comprises the steps of: steel making, continuous casting, hot rolling, cold rolling and continuous annealing; wherein high-temperature humidification decarburization is carried out in a continuous annealing step: and under the condition that the temperature of the steel plate is 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of 5-100 microns.
19. The method for manufacturing a three-layer composite structure high-strength steel plate according to claim 17, wherein the parameters of the continuous annealing process are controlled in the continuous annealing step to at least satisfy at least one of the following:
controlling the heat preservation temperature to be 780-900 ℃ and the heat preservation time to be 40-160 s;
the rapid cooling starting temperature is 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃;
the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
20. The method for manufacturing a three-layer composite structure high-strength steel sheet as claimed in any one of claims 1 to 4,6 to 11, wherein when the three-layer composite structure high-strength steel sheet is a cold-rolled steel sheet, it comprises the steps of: steel making, continuous casting, hot rolling, cold rolling, decarbonizing in a high-temperature humidifying decarbonizing furnace and continuous annealing; wherein in the decarbonization process of the high-temperature humidifying decarbonization furnace, the dew point in the annealing furnace is controlled to be-15 ℃ under the condition that the temperature of the steel plate is 750-900 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of 5-100 microns.
21. The method for manufacturing a three-layer composite structure high-strength steel plate according to claim 19, wherein the parameters of the continuous annealing process are controlled in the continuous annealing step to at least satisfy at least one of the following:
controlling the heat preservation temperature to be 780-900 ℃ and the heat preservation time to be 40-160 s;
the rapid cooling starting temperature is 650-780 ℃; the fast cooling speed is 30-1500 ℃/s; the rapid cooling termination temperature is 50-450 ℃;
the overaging temperature is 180-450 ℃; the overaging time is 200-600 s.
22. The method of manufacturing a three-layer composite structure high-strength steel sheet as set forth in claim 19, wherein the high-temperature humidification decarburization is continued in the continuous annealing process: and under the condition that the temperature of the steel plate is 750-900 ℃, the dew point in the annealing furnace is controlled to be-15 ℃, and the reaction time is 40-160s, so that the upper surface layer and the lower surface layer of the steel plate respectively become decarburized layers with the thickness of more than 100 micrometers.
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| PCT/CN2021/079355 WO2021175318A1 (en) | 2020-03-06 | 2021-03-05 | Three-layer composite structure high-strength steel plate and manufacturing method therefor |
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| WO2025002398A1 (en) * | 2023-06-30 | 2025-01-02 | 宝山钢铁股份有限公司 | Ultrahigh-strength steel plate having high r value and manufacturing method therefor |
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