CN111455272A - Hot-rolled high-strength S500M L steel plate and production method thereof - Google Patents
Hot-rolled high-strength S500M L steel plate and production method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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
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- 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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- C21D8/0226—Hot rolling
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- 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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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Abstract
The invention discloses a hot-rolled high-strength S500M L steel plate and a production method thereof, and relates to the technical field of steel smelting, wherein the maximum thickness of the steel plate is 100mm, and the steel plate comprises the following chemical components in percentage by mass of 0.04-0.12% of C, 1.30-1.70% of Mn, 0.10-0.40% of Si, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.05% of Nb, 0.10-0.30% of Cr, less than or equal to 0.020% of Ti, 0.02-0.06% of Alt, less than or equal to 0.43% of CEV, less than or equal to 0.21% of Pcm, and the balance of Fe and inevitable impurities.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a hot-rolled high-strength S500M L steel plate and a production method thereof.
Background
The marine structure is subjected to severe environments such as typhoon on the sea surface, severe cold and freezing, high salt spray and the like, so that the steel plate for the marine structure is required to have high strength and high plasticity, excellent low-temperature toughness, good welding performance and the like. Particularly, structural members serving underwater, such as transition sections and the like, need to meet the requirements of lower temperature impact at minus 60 ℃ so as to ensure that steel and equipment can adapt to various loads and low temperature environments and meet the use requirements under various complex working conditions and severe natural environments on the sea.
S500M L is a steel type with highest strength grade and most strict impact requirement specified in EN10025-4:2019 Standard thermo-mechanical rolling welding fine grain steel, the standard requires delivery of thermo-mechanical rolling state, and specifies chemical components, mechanical properties and the like of the thermo-mechanical rolling welding fine grain steel, compared with a national standard same grade Q500E (-40 ℃ impact) steel plate, the S500M L steel type has more strict requirements on adding alloy elements such as C, Mn, Nb and the like, and requires-50 ℃ low temperature impact performance, and in actual engineering projects, part of the steel type even requires-60 ℃ low temperature impact, and in addition, requires lower CEV and Pcm requirements, and excellent welding performance is ensured.
The patent with the application number of 201310559278.8 discloses a production method of a quenched and tempered high-strength Q500E super-thick steel plate, which needs offline quenching → tempering treatment after the steel plate is rolled, and has long production flow and complex production process; the addition amount of the designed precious alloy elements is high, the hardenability is improved by adding B, the CEV is high, for example, Cu + Ni is less than or equal to 1.0%, Cr =0.40% -0.70%, Mo =0.30% -0.60%, B is less than or equal to 0.0025%, and the CEV is controlled to be less than or equal to 0.58%.
The existing low-temperature impact national standard Q500E or European standard S500M L grade steel plate adopts quenching and tempering processes, has long production flow and complex production process, and in order to ensure the hardenability of the steel plate and the high-required low-temperature impact toughness, a plurality of elements such as Mo, Cr, Ni, B and the like are added in the component design under the general condition, so that the CEV of the steel is higher.
Disclosure of Invention
In order to solve the technical problems, the invention provides a hot-rolled high-strength S500M L steel plate, the maximum thickness of which is 100mm, the steel plate comprises the following chemical components, by mass, 0.04-0.12% of C, 1.30-1.70% of Mn, 0.10-0.40% of Si, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.05% of Nb, 0.10-0.30% of Cr, less than or equal to 0.020% of Ti, 0.02-0.06% of Alt, less than or equal to 0.43% of CEV, less than or equal to 0.21% of Pcm, and the balance Fe and inevitable impurities.
The invention has the technical effects that the invention adopts low-carbon (less than or equal to 0.12%) component design and TMCP process production, adds low-content Nb and Ti microalloying, does not add noble metals such as Ni, Mo and V, adopts technologies such as differential temperature rolling in the thickness direction in the rough rolling process, low-temperature controlled rolling in the two-stage process, ultra-fast cooling of a rolled steel plate and the like to develop a hot-rolled high-strength S500M L steel plate, the maximum thickness of the steel plate is 100mm, the performance completely meets EN10025-4 standard requirements, the low-temperature impact performance of the steel plate is excellent, particularly the low-temperature impact energy at-60 ℃ is more than or equal to 150J, the CEV of the steel plate is less than or equal to 0.43 percent, the Pcm is less than or equal to 0.21 percent, the welding performance is more excellent, the economic and batch production of the steel plate can be realized, the use.
Another object of the present invention is to provide a method for producing a hot-rolled high-strength S500M L steel sheet according to claim 1, comprising a steel-making process, a slab heating process, a rolling process, a controlled cooling process,
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain continuous casting billet with center segregation within C1.0 level;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 9.0-14.0 min/cm, and the heating temperature is 1100-1200 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3-pass rolling, and the final temperature of rough rolling is more than or equal to 980 ℃; the initial rolling temperature of the second stage is less than or equal to 780 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 8-15 ℃/s, and the temperature for returning red of the thick plate is 450-550 ℃; and then carrying out stacking slow cooling for more than 72 h.
The technical scheme of the invention is further defined as follows:
the production method of the hot-rolled high-strength S500M L steel plate has a thickness of 100mm, and comprises the following chemical components by mass percent of 0.06% of C, 1.62% of Mn, 0.34% of Si, 0.011% of P, 0.001% of S, 0.039% of Nb, 0.27% of Cr, 0.014% of Ti, 0.032% of Alt, 0.39% of CEV, 0.18% of Pcm, and the balance of Fe and inevitable impurities;
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the continuous casting billet center segregation C0.5 grade;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.9min/cm, and the heating temperature is 1169 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3-pass rolling, and the final temperature of the rough rolling is 992 ℃; the initial rolling temperature of the second stage is 753 ℃, and the final rolling temperature is 738 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 13 ℃/s, and the temperature for returning the thick plate to red is 476 ℃; then, stacking and slow cooling are carried out for 72 h.
The production method of the hot-rolled high-strength S500M L steel plate comprises the following chemical components by mass percentage of 0.08% of C, 1.57% of Mn, 0.30% of Si, 0.008% of P, 0.002% of S, 0.041% of Nb, 0.25% of Cr, 0.012% of Ti, 0.036% of Alt, 0.40% of CEV, 0.19% of Pcm and the balance of Fe and inevitable impurities, wherein the thickness of the steel plate is 100 mm;
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the C1.0 grade of continuous casting billet center segregation;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.2min/cm, and the heating temperature is 1191 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, the blank is cooled by water penetration before the last 3-pass rolling, and the final rough rolling temperature is 1003 ℃; the initial rolling temperature of the second stage is 758 ℃, and the final rolling temperature is 733 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 12 ℃/s, and the temperature of the thick plate returning to red is 488 ℃; then, stacking and slow cooling are carried out for 72 h.
The production method of the hot-rolled high-strength S500M L steel plate comprises the following chemical components by mass percent, 0.10% of C, 1.49% of Mn, 0.27% of Si, 0.010% of P, 0.002% of S, 0.036% of Nb, 0.24% of Cr, 0.015% of Ti, 0.033% of Alt, 0.40% of CEV, 0.20% of Pcm, and the balance of Fe and inevitable impurities, wherein the thickness of the steel plate is 80 mm;
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the C1.0 grade of continuous casting billet center segregation;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 11.4min/cm, and the heating temperature is 1147 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3-pass rolling, and the final rough rolling temperature is 986 ℃; the initial rolling temperature of the second stage is 762 ℃, and the final rolling temperature is 727 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 10 ℃/s, and the temperature for returning the thick plate to red is 505 ℃; then, stacking and slow cooling are carried out for 72 h.
The production method of the hot-rolled high-strength S500M L steel plate has a thickness of 70mm, and comprises the following chemical components by mass percent of 0.11% of C, 1.42% of Mn, 0.25% of Si, 0.013% of P, 0.003% of S, 0.032% of Nb, 0.21% of Cr, 0.011% of Ti, 0.038% of Alt, 0.40% of CEV, 0.20% of Pcm, and the balance of Fe and inevitable impurities;
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the continuous casting billet center segregation C0.5 grade;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.6min/cm, and the heating temperature is 1155 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3-pass rolling, and the final temperature of the rough rolling is 992 ℃; the initial rolling temperature of the second stage is 776 ℃, and the final rolling temperature is 731 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 9 ℃/s, and the temperature for returning the thick plate to red is 531 ℃; then, stacking and slow cooling are carried out for 72 h.
The invention has the beneficial effects that:
(1) the hot-rolled high-strength S500M L thick plate is produced by using a TMCP (thermal mechanical control processing) process, the technical equipment advantages of a 5000mm wide and thick plate rolling mill are fully exerted, the technologies of differential temperature rolling in the thickness direction in the rough rolling process, low-temperature controlled rolling in the two-stage process, ultra-fast cooling of a rolled steel plate and the like are adopted, the obtained steel plate has uniform and fine tissue, the specific metallographic structure is an F tissue and a small amount of P tissue, the grain size is 9.0-10.5 grade, the performance completely meets the EN10025-4 standard requirement, particularly the steel plate has excellent low-temperature impact at-60 ℃, and the low-temperature impact power is more than or;
(2) the high-strength S500M L thick plate produced by the invention adopts low-carbon (less than or equal to 0.12%) component design, lower-content Nb and Ti are added for microalloying, noble metals such as Ni, Mo and V are not added, the alloy cost is low, the CEV of a steel plate is less than or equal to 0.43%, Pcm is less than or equal to 0.21%, and the welding performance is more excellent;
(3) the maximum thickness of the steel plate obtained by the invention reaches 100mm, the low-temperature impact toughness, the welding performance and the like are good, the market demand is large, the economic benefit is good, and the gross profit per ton of steel is estimated to be more than 1000 yuan/ton.
Detailed Description
Example 1
The hot-rolled high-strength S500M L steel sheet provided in this example had a thickness of 100mm and had chemical compositions and mass percentages of 0.06% C, 1.62% Mn, 0.34% Si, 0.011% P, 0.001% S, 0.039% Nb, 0.27% Cr, 0.014% Ti, 0.032% Alt, 0.39% CEV, 0.18% Pcm, and the balance Fe and unavoidable impurities.
The production method comprises the following steps:
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the continuous casting billet center segregation C0.5 grade;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.9min/cm, the heating temperature is 1169 ℃, and the Nb element solid solution and the casting blank heating uniformity are ensured;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3 times of rolling, rolling is carried out after a large temperature difference between the surface and the core of the casting blank is formed, so that rolling deformation can permeate into the core of a steel plate, and the rough rolling final temperature is 992 ℃; the initial rolling temperature of the second stage is 753 ℃, and the final rolling temperature is 738 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 13 ℃/s, and the temperature for returning the thick plate to red is 476 ℃; then, stacking and slow cooling are carried out for 72 h.
The mechanical properties of the steel plate are as follows: yield strength 472MPa, tensile strength 577MPa, elongation after fracture 21.5%, impact energy Akv at-50 ℃: 302J, 300J, impact energy Akv at-60 ℃: 242J, 213J, 280J.
Example 2
The hot-rolled high-strength S500M L steel sheet provided in this example had a thickness of 100mm and had chemical compositions and mass percentages of 0.08% C, 1.57% Mn, 0.30% Si, 0.008% P, 0.002% S, 0.041% Nb, 0.25% Cr, 0.012% Ti, 0.036% Alt, 0.40% CEV, 0.19% Pcm, and the balance Fe and unavoidable impurities.
The production method comprises the following steps:
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the C1.0 grade of continuous casting billet center segregation;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.2min/cm, the heating temperature is 1191 ℃, and the solid solution of Nb element and the heating uniformity of the casting blank are ensured;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3 times of rolling, rolling is carried out after a large temperature difference between the surface and the core of the casting blank is formed, so that rolling deformation can permeate into the core of the steel plate, and the rough rolling final temperature is 1003 ℃; the initial rolling temperature of the second stage is 758 ℃, and the final rolling temperature is 733 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 12 ℃/s, and the temperature of the thick plate returning to red is 488 ℃; then, stacking and slow cooling are carried out for 72 h.
The mechanical properties of the steel plate are as follows: 473MPa of yield strength, 582MPa of tensile strength, 22.5% of elongation after fracture, Akv of impact energy at-50 ℃: 300J, 296J, 280J, impact energy Akv at-60 ℃: 242J, 282J, 274J.
Example 3
The hot-rolled high-strength S500M L steel plate provided in this example had a thickness of 80mm and had chemical compositions and mass percentages of 0.10% C, 1.49% Mn, 0.27% Si, 0.010% P, 0.002% S, 0.036% Nb, 0.24% Cr, 0.015% Ti, 0.033% Alt, 0.40% CEV, 0.20% Pcm, and the balance Fe and unavoidable impurities.
The production method comprises the following steps:
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the C1.0 grade of continuous casting billet center segregation;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 11.4min/cm, the heating temperature is 1147 ℃, and the solid solution of Nb element and the heating uniformity of the casting blank are ensured;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3 times of rolling, rolling is carried out after a large temperature difference between the surface and the core of the casting blank is formed, so that rolling deformation can permeate into the core of a steel plate, and the rough rolling final temperature is 986 ℃; the initial rolling temperature of the second stage is 762 ℃, and the final rolling temperature is 727 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 10 ℃/s, and the temperature for returning the thick plate to red is 505 ℃; then, stacking and slow cooling are carried out for 72 h.
The mechanical properties of the steel plate are as follows: yield strength 484MPa, tensile strength 594MPa, elongation after fracture 22%, impact energy Akv at-50 ℃: 288J, 264J, 254J, impact energy Akv at-60 ℃: 284J, 225J, 314J.
Example 4
The hot-rolled high-strength S500M L steel sheet provided in this example had a thickness of 70mm and had the chemical composition and mass% of C0.11%, Mn 1.42%, Si 0.25%, P0.013%, S0.003%, Nb 0.032%, Cr 0.21%, Ti 0.011%, Alt 0.038%, CEV 0.40%, Pcm 0.20%, and the balance Fe and unavoidable impurities.
The production method comprises the following steps:
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the continuous casting billet center segregation C0.5 grade;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.6min/cm, the heating temperature is 1155 ℃, and the solid solution of Nb element and the heating uniformity of the casting blank are ensured;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3 times of rolling, rolling is carried out after a large temperature difference between the surface and the core of the casting blank is formed, so that rolling deformation can permeate into the core of a steel plate, and the rough rolling final temperature is 992 ℃; the initial rolling temperature of the second stage is 776 ℃, and the final rolling temperature is 731 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 9 ℃/s, and the temperature for returning the thick plate to red is 531 ℃; then stacking and slowly cooling are carried out for 72h
The mechanical properties of the steel plate are as follows: yield strength 505MPa, tensile strength 624MPa, elongation after fracture 20%, impact energy Akv at-50 deg.C: 318J, 312J, 236J, impact energy Akv at-60 ℃: 228J, 198J, 312J.
With the continuous advance of ocean resource development to deep sea, the demand of steel for offshore wind power, offshore platforms, ocean engineering and the like is continuously expanded, the EN10025-4 standard is thermo-mechanical rolling welding fine grain steel, the low-temperature impact toughness of-20 ℃ to-50 ℃ series is good, the welding performance is good, the market demand is large, the economic benefit is good, and the gross profit per ton of steel is estimated to be more than 1000 yuan/ton.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. The hot-rolled high-strength S500M L steel plate is characterized in that the maximum thickness of the steel plate is 100mm, and the steel plate comprises, by mass, 0.04-0.12% of C, 1.30-1.70% of Mn, 0.10-0.40% of Si, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.05% of Nb, 0.10-0.30% of Cr, less than or equal to 0.020% of Ti, 0.02-0.06% of Alt, less than or equal to 0.43% of CEV, less than or equal to 0.21% of Pcm, and the balance Fe and inevitable impurities.
2. A method of producing a hot rolled high strength S500M L steel sheet according to claim 1, comprising a steel making process, a slab heating process, a rolling process, a controlled cooling process, wherein:
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain continuous casting billet with center segregation within C1.0 level;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 9.0-14.0 min/cm, and the heating temperature is 1100-1200 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3-pass rolling, and the final temperature of rough rolling is more than or equal to 980 ℃; the initial rolling temperature of the second stage is less than or equal to 780 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 8-15 ℃/s, and the temperature for returning red of the thick plate is 450-550 ℃; and then carrying out stacking slow cooling for more than 72 h.
3. The method of claim 2, wherein the steel sheet has a thickness of 100mm and comprises, in terms of chemical composition and mass%, C0.06%, Mn 1.62%, Si 0.34%, P0.011%, S0.001%, Nb 0.039%, Cr 0.27%, Ti 0.014%, Alt 0.032%, CEV 0.39%, Pcm 0.18%, and the balance Fe and unavoidable impurities;
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the continuous casting billet center segregation C0.5 grade;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.9min/cm, and the heating temperature is 1169 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3-pass rolling, and the final temperature of the rough rolling is 992 ℃; the initial rolling temperature of the second stage is 753 ℃, and the final rolling temperature is 738 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 13 ℃/s, and the temperature for returning the thick plate to red is 476 ℃; then, stacking and slow cooling are carried out for 72 h.
4. The method of claim 2, wherein the steel sheet has a thickness of 100mm and comprises, in terms of chemical composition and mass%, C0.08%, Mn 1.57%, Si 0.30%, P0.008%, S0.002%, Nb 0.041%, Cr 0.25%, Ti 0.012%, Alt 0.036%, CEV 0.40%, Pcm 0.19%, and the balance Fe and unavoidable impurities;
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the C1.0 grade of continuous casting billet center segregation;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.2min/cm, and the heating temperature is 1191 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, the blank is cooled by water penetration before the last 3-pass rolling, and the final rough rolling temperature is 1003 ℃; the initial rolling temperature of the second stage is 758 ℃, and the final rolling temperature is 733 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 12 ℃/s, and the temperature of the thick plate returning to red is 488 ℃; then, stacking and slow cooling are carried out for 72 h.
5. The method of claim 2, wherein the steel sheet has a thickness of 80mm, and comprises, by mass, 0.10% C, 1.49% Mn, 0.27% Si, 0.010% P, 0.002% S, 0.036% Nb, 0.24% Cr, 0.015% Ti, 0.033% Alt, 0.40% CEV, 0.20% Pcm, and the balance Fe and unavoidable impurities;
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the C1.0 grade of continuous casting billet center segregation;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 11.4min/cm, and the heating temperature is 1147 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3-pass rolling, and the final rough rolling temperature is 986 ℃; the initial rolling temperature of the second stage is 762 ℃, and the final rolling temperature is 727 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 10 ℃/s, and the temperature for returning the thick plate to red is 505 ℃; then, stacking and slow cooling are carried out for 72 h.
6. The method of claim 2, wherein the steel sheet has a thickness of 70mm and comprises, in terms of chemical composition and mass%, C0.11%, Mn 1.42%, Si 0.25%, P0.013%, S0.003%, Nb 0.032%, Cr 0.21%, Ti 0.011%, Alt 0.038%, CEV 0.40%, Pcm 0.20%, and the balance Fe and unavoidable impurities;
in the steelmaking process, molten iron pretreatment desulfurization, converter deep dephosphorization, L F deep desulfurization, dynamic soft reduction and electromagnetic stirring are adopted to obtain the continuous casting billet center segregation C0.5 grade;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.6min/cm, and the heating temperature is 1155 ℃;
a rolling procedure: two-stage controlled rolling is adopted, in the first-stage rough rolling process, water cooling is carried out on the blank before the last 3-pass rolling, and the final temperature of the rough rolling is 992 ℃; the initial rolling temperature of the second stage is 776 ℃, and the final rolling temperature is 731 ℃;
a cooling process: the rolled steel plate is put into an ultra-fast cooling system for fast cooling, the cooling speed is 9 ℃/s, and the temperature for returning the thick plate to red is 531 ℃; then, stacking and slow cooling are carried out for 72 h.
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