WO2023000584A1 - 1000 mpa-grade quenched and tempered hydroelectric steel plate and production method therefor - Google Patents

1000 mpa-grade quenched and tempered hydroelectric steel plate and production method therefor Download PDF

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WO2023000584A1
WO2023000584A1 PCT/CN2021/136684 CN2021136684W WO2023000584A1 WO 2023000584 A1 WO2023000584 A1 WO 2023000584A1 CN 2021136684 W CN2021136684 W CN 2021136684W WO 2023000584 A1 WO2023000584 A1 WO 2023000584A1
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steel plate
tempered
quenched
temperature
hydropower
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PCT/CN2021/136684
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French (fr)
Chinese (zh)
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潘中德
刘心阳
吴俊平
夏政海
洪君
姜金星
姜在伟
郭怀兵
顾小阳
孙旭东
王亚东
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南京钢铁股份有限公司
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • 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

Definitions

  • the invention relates to the technical field of iron and steel production, in particular to a 1000MPa quenched and tempered steel plate for hydropower and a production method thereof.
  • CN 108315541 B discloses "a GB-Q&T production method of a 1000MPa-grade hydropower steel plate not greater than 48mm thick", the steel plate composition design C: 0.12% ⁇ 0.18%, Cu: 0.02% ⁇ 0.20%, Nb: 0.08% ⁇ 0.15 %, Cu alloy is added in the composition design, and the content of Nb element is high, and the cost of the alloy is high; due to the high C content and Pcm in the composition design, it will also lead to a higher preheating temperature for steel plate welding, which will affect the production efficiency of the project site .
  • CN 108385034 B discloses “a LGB-Q&T method for a 1000MPa-grade steel plate not greater than 100mm thick for hydroelectricity”, the composition design C: 0.12% ⁇ 0.21%, Cu: 0.02% ⁇ 0.20%, Nb: 0.03% ⁇ 0.10%, Alloys such as Cu and Nb are added to the composition design, and the cost of the alloy is high; the steel plate after controlled rolling in this invention needs to be water-cooled to 400-600°C, and the cooling rate is required to be 10-25°C/s, which requires very high requirements for online cooling equipment. It is very difficult to control; due to the high C content and Pcm of the composition design, it will also lead to a higher preheating temperature when the steel plate is welded and used, which will affect the production efficiency of the project site.
  • the existing 1000MPa grade hydropower steel plate in order to ensure the high strength requirement of the steel plate after Q+T heat treatment, generally adopts the design of C ⁇ 0.12%, and the compound addition method of Nb, V, Ti, Ni, Cr, Mo, Cu alloy, and there are many types of alloys 1.
  • the cost of the alloy is high, and the Pcm value of the steel type is more than 0.26%.
  • a higher preheating temperature is required before the steel plate is welded, and the construction efficiency of the project site is low.
  • the existing 1000MPa high-strength steel plate produced by the DQ+T heat treatment process can reduce the C content to below 0.12%. The manufacturing efficiency is low, and it is very difficult to control the thick plate production process, and it is difficult to completely control the quality stability.
  • the present invention aims at the above technical problems, overcomes the shortcomings of the prior art, and provides a 1000MPa grade quenched and tempered steel plate for hydropower, its chemical composition and weight percentage are: C: 0.08%-0.11%, Mn: 1.00%-1.50%, Si: 0.10% ⁇ 0.50%, P ⁇ 0.012%, S ⁇ 0.003%, Alt: 0.050% ⁇ 0.080%, V: 0.040% ⁇ 0.060%, Ti: 0.008% ⁇ 0.020%, Ni: 1.00% ⁇ 1.70%, Cr: 0.30%-0.60%, Mo: 0.40%-0.60%, B: 0.001%-0.002%, Pcm ⁇ 0.26%, and the rest is Fe and impurities.
  • the aforementioned 1000MPa grade quenched and tempered steel plate for hydroelectricity, its chemical composition and weight percentage are: C: 0.08%-0.10%, Mn: 1.20%-1.50%, Si: 0.15%-0.50%, P ⁇ 0.012 %, S ⁇ 0.003%, Alt: 0.050% ⁇ 0.070%, V: 0.040% ⁇ 0.060%, Ti: 0.008% ⁇ 0.020%, Ni: 1.00% ⁇ 1.20%, Cr: 0.30% ⁇ 0.60%, Mo: 0.40 % ⁇ 0.60%, B: 0.001% ⁇ 0.002%, Pcm ⁇ 0.25%, and the rest is Fe and impurities.
  • the aforementioned 1000MPa grade quenched and tempered steel plate for hydroelectricity, its chemical composition and weight percentage are: C: 0.10% to 0.11%, Mn: 1.00% to 1.20%, Si: 0.20% to 0.50%, P ⁇ 0.012 %, S ⁇ 0.003%, Alt: 0.050% ⁇ 0.070%, V: 0.040% ⁇ 0.060%, Ti: 0.008% ⁇ 0.020%, Ni: 1.21% ⁇ 1.70%, Cr: 0.40% ⁇ 0.60%, Mo: 0.40 % ⁇ 0.60%, B: 0.001% ⁇ 0.002%, Pcm ⁇ 0.26%, and the rest is Fe and impurities.
  • Another object of the present invention is to provide a production method of 1000MPa grade quenched and tempered steel plate for hydropower, including steelmaking process, billet heating process, rolling process, heat treatment process, specifically:
  • Steelmaking process Smelt molten steel according to the designed chemical composition and continuously cast it into slabs.
  • the continuous casting adopts dynamic light reduction and electromagnetic stirring technology, and the center segregation of the continuous casting slab is below C1.0 level;
  • Heating process the slab is heated in a heating furnace, the heating coefficient is 10.0-14.0min/cm, and the heating temperature is 1180-1220°C to ensure the heating uniformity of the slab;
  • Rolling process two-stage controlled rolling process is adopted, the total reduction rate in the first stage is ⁇ 60%, and the final rolling temperature is ⁇ 1000°C; 810 ⁇ 850°C, the total reduction rate in the first stage is ⁇ 40%; the rolled steel plate is cooled to room temperature in air;
  • Heat treatment process the steel plate is put into the furnace for off-line quenching and tempering heat treatment, wherein the quenching temperature is 880-930°C, and the time in the furnace is 1.5-2.0min/mm; the tempering temperature is 600-640°C, and the time in the furnace is 2.5-4.0min/mm.
  • the maximum thickness of the steel plate is 56 mm.
  • the metallographic structure of the steel plate is tempered sorbite and a small amount of tempered martensite.
  • the present invention adopts low-carbon peritectic steel, Ni+Cr+Mo alloying design, V+Ti microalloying, and higher Al elements and trace B elements to improve the hardenability of the steel plate without adding Nb, Cu and other alloys, on the basis of ensuring performance, combine the comprehensive effects of basic elements such as C, Si, Mn, Al, V, Ti, B, Ni, Cr, Mo in the chemical composition to improve the strength of steel grades and affect the toughness of steel grades ;
  • the present invention has low requirements on production equipment, simple production process, high-efficiency production of steel plates, and good economic benefits.
  • the estimated gross profit per ton of steel is more than 1,000 yuan/ton;
  • Fig. 1 is the microstructure of 1/4 thickness of the steel plate of embodiment 3.
  • the production method of a 1000MPa grade quenched and tempered steel plate for hydropower provided in this embodiment has a thickness of 24 mm, including a steelmaking process, a billet heating process, a rolling process, and a heat treatment process, specifically:
  • Heating process is that the heating coefficient of the billet is 10.8min/cm, and the heating temperature is 1187°C;
  • Rolling process Two-stage controlled rolling process is adopted, the total reduction rate in the first stage is ⁇ 70%, and the final rolling temperature is 1022°C; the starting rolling temperature in the second stage is 878°C, and the final rolling temperature is 836°C The reduction rate is ⁇ 60%; the rolled steel plate is cooled in the air;
  • Heat treatment process the steel plate is put into the furnace for off-line quenching and tempering heat treatment, wherein the quenching temperature is 895°C, and the time in the furnace is 41 minutes; the tempering temperature is 631°C, and the time in the furnace is 82 minutes;
  • the mechanical properties of this 24mm specification 1000MPa grade quenched and tempered steel plate for hydropower are: yield strength 964MPa, tensile strength 979MPa, elongation after fracture 17%, and transverse impact energy Akv at -60°C: 141, 136, 186J.
  • the production method of a 1000MPa grade quenched and tempered steel plate for hydropower provided in this embodiment has a thickness of 48mm, including a steelmaking process, a billet heating process, a rolling process, and a heat treatment process, specifically:
  • Casting is 320mm continuous casting slab, and the slab center segregation is C0.5 grade;
  • Heating process is that the heating coefficient of the billet is 11.7min/cm, and the heating temperature is 1204°C;
  • Rolling process two-stage controlled rolling process is adopted, the total reduction rate in the first stage is ⁇ 60%, and the final rolling temperature is 1019°C; the starting rolling temperature in the second stage is 851°C, and the final rolling temperature is 825°C The reduction rate is ⁇ 50%; the rolled steel plate is cooled in the air;
  • Heat treatment process the steel plate is put into the furnace for off-line quenching and tempering heat treatment, in which the quenching temperature is 901°C, and the time in the furnace is 88 minutes; tempering heat treatment, the tempering temperature is 618°C, and the time in the furnace is 153 minutes.
  • the mechanical properties of this 48mm specification 1000MPa grade quenched and tempered steel plate for hydropower are: yield strength 911MPa, tensile strength 986MPa, elongation after fracture 17.5%, and transverse impact energy Akv at -60°C: 106, 111, 122J.
  • the production method of a 1000MPa grade quenched and tempered steel plate for hydroelectricity provided in this embodiment has a thickness of 56 mm, including a steelmaking process, a billet heating process, a rolling process, and a heat treatment process, specifically:
  • component content (wt): C: 0.11%, Mn: 1.03%, P: 0.006%, S: 0.001%, Si: 0.18%, Alt: 0.063%, V: 0.058%, Ti: 0.016% , Ni: 1.52%, Cr: 0.48%, Mo: 0.44%, B: 0.0013%, Pcm: 0.26%, the rest is Fe and impurities, smelted according to the above ingredients, and the continuous casting process adopts dynamic light reduction and electromagnetic stirring technology. Casting is 260mm continuous casting slab, and the center segregation of the casting slab is C1.0 grade;
  • Heating process is that the heating coefficient of the billet is 11.3min/cm, and the heating temperature is 1209°C;
  • Rolling process two-stage controlled rolling process is adopted, the total reduction ratio in the first stage is ⁇ 60%, and the final rolling temperature is 1017°C; the starting rolling temperature in the second stage is 832°C, and the final rolling temperature is 813°C The reduction rate is ⁇ 40%; the rolled steel plate is cooled in the air;
  • Heat treatment process the steel plate is put into the furnace for off-line quenching and tempering heat treatment, wherein the quenching temperature is 913°C, and the time in the furnace is 102 minutes; tempering heat treatment, the tempering temperature is 607°C, and the time in the furnace is 175 minutes.
  • the mechanical properties of this 56mm specification 1000MPa grade quenched and tempered steel plate for hydropower are: yield strength 975MPa, tensile strength 990MPa, elongation after fracture 15.5%, and transverse impact energy Akv at -60°C: 107, 147, 150J.
  • the steel plate metallographic structure is tempered sorbite and a small amount of tempered martensite, and its yield strength At 911 ⁇ 975MPa, the tensile strength is 979 ⁇ 990MPa, the elongation after breaking is between 15.5% ⁇ 17.5%, and the transverse impact energy at -60°C is not less than 100J.
  • the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Abstract

The present invention relates to the technical field of steel production. Disclosed are a 1000 MPa-grade quenched and tempered hydroelectric steel plate and a production method therefor, comprising the following chemical components in percentage by weight: C: 0.08％-0.11％; Mn: 1.00％-1.50％; Si: 0.10％-0.50％; P≤0.012％; S≤0.003％; Alt: 0.050％-0.080％; V: 0.040％-0.060％; Ti: 0.008％-0.020％; Ni: 1.00％-1.70％; Cr: 0.30％-0.60％; Mo: 0.40％-0.60％; B: 0.001％-0.002％; Pcm≤0.26％; and the balance being Fe and impurities. The 1000 MPa-grade quenched and tempered hydroelectric steel plate is obtained, the maximum thickness of the steel plate reaches 56 mm, the yield strength is greater than or equal to 885 MPa, and the tensile strength is 950-1130 MPa. The transverse low-temperature impact energy of the steel plate at a temperature of -60℃ is greater than or equal to 100 J. Since the carbon content is low and the welding cold crack sensitivity coefficient Pcm is less than or equal to 0.26%, the steel plate can be used at a low preheating temperature, and the welding quality and the welding efficiency of a hydropower engineering project construction site are improved.

Description

一种1000MPa级调质型水电用钢板及其生产方法A 1000MPa grade quenched and tempered steel plate for hydropower and its production method 技术领域technical field
本发明涉及钢铁生产技术领域，特别是涉及一种1000MPa级调质型水电用钢板及其生产方法。The invention relates to the technical field of iron and steel production, in particular to a 1000MPa quenched and tempered steel plate for hydropower and a production method thereof.
背景技术Background technique
随着清洁能源的开发与利用，大型水力发电工程项目用800MPa高强度钢板已得到广泛应用，更大压力管道用1000MPa级高强钢板也提出了需求，要求钢板不但具有高强度和高塑性，还应具备优异的低温韧性、良好的焊接性能等。With the development and utilization of clean energy, 800MPa high-strength steel plates for large-scale hydropower projects have been widely used, and 1000MPa-grade high-strength steel plates for larger pressure pipelines have also raised demand, requiring steel plates not only to have high strength and high plasticity, but also to It has excellent low temperature toughness, good welding performance, etc.
CN 108315541 B公开了“一种不大于48mm厚1000MPa级水电用钢板的GB-Q&T生产方法”，钢板成分设计C：0.12％～0.18％，Cu：0.02％～0.20％，Nb：0.08％～0.15％，成分设计中添加Cu合金，且Nb元素含量较高，合金成本高；因成分设计C含量、Pcm偏高，也会导致钢板焊接使用时需要更高的预热温度，影响工程现场生产效率。CN 108315541 B discloses "a GB-Q&T production method of a 1000MPa-grade hydropower steel plate not greater than 48mm thick", the steel plate composition design C: 0.12% ~ 0.18%, Cu: 0.02% ~ 0.20%, Nb: 0.08% ~ 0.15 %, Cu alloy is added in the composition design, and the content of Nb element is high, and the cost of the alloy is high; due to the high C content and Pcm in the composition design, it will also lead to a higher preheating temperature for steel plate welding, which will affect the production efficiency of the project site .
CN 108385034 B公开了“一种不大于100mm厚1000MPa级水电用钢板的LGB-Q&T方法”，成分设计C：0.12％～0.21％，Cu：0.02％～0.20％，Nb：0.03％～0.10％，成分设计中添加Cu、Nb等合金，合金成本高；该发明控轧后的钢板需水冷至400～600℃，要求冷却速率为10～25℃/s，对在线冷却装备要求非常高，生产工艺控制难度非常大；因成分设计C含量、Pcm偏高，也会导致钢板焊接使用时需要更高的预热温度，影响工程现场生产效率。CN 108385034 B discloses “a LGB-Q&T method for a 1000MPa-grade steel plate not greater than 100mm thick for hydroelectricity”, the composition design C: 0.12%～0.21%, Cu: 0.02%～0.20%, Nb: 0.03%～0.10%, Alloys such as Cu and Nb are added to the composition design, and the cost of the alloy is high; the steel plate after controlled rolling in this invention needs to be water-cooled to 400-600°C, and the cooling rate is required to be 10-25°C/s, which requires very high requirements for online cooling equipment. It is very difficult to control; due to the high C content and Pcm of the composition design, it will also lead to a higher preheating temperature when the steel plate is welded and used, which will affect the production efficiency of the project site.
现有的1000MPa级水电钢板，为保证钢板Q+T热处理后高强度要求，一般采用C≥0.12％设计，以及Nb、V、Ti、Ni、Cr、Mo、Cu合金复合添加方式，合金种类多、合金成本高，且导致钢种Pcm值达0.26％以上，钢板焊接前需采用较高的预热温度，工程现场施工效率低。另外，现有采用DQ+T热处理工艺生产的1000MPa级高强钢板，可以降低C含量至0.12％以下，但该工艺对轧机装备的低温轧制能力、在线冷却装备的冷却速率等要求非常高，轧制生产效率偏低，且 厚板生产工艺控制难度非常大，且质量稳定性难以完全受控。The existing 1000MPa grade hydropower steel plate, in order to ensure the high strength requirement of the steel plate after Q+T heat treatment, generally adopts the design of C≥0.12%, and the compound addition method of Nb, V, Ti, Ni, Cr, Mo, Cu alloy, and there are many types of alloys 1. The cost of the alloy is high, and the Pcm value of the steel type is more than 0.26%. A higher preheating temperature is required before the steel plate is welded, and the construction efficiency of the project site is low. In addition, the existing 1000MPa high-strength steel plate produced by the DQ+T heat treatment process can reduce the C content to below 0.12%. The manufacturing efficiency is low, and it is very difficult to control the thick plate production process, and it is difficult to completely control the quality stability.
发明内容Contents of the invention
本发明针对上述技术问题，克服现有技术的缺点，提供一种1000MPa级调质型水电用钢板，其化学成分及重量百分比为：C：0.08％～0.11％，Mn：1.00％～1.50％，Si：0.10％～0.50％，P≤0.012％，S≤0.003％，Alt：0.050％～0.080％，V：0.040％～0.060％，Ti：0.008％～0.020％，Ni：1.00％～1.70％，Cr：0.30％～0.60％，Mo：0.40％～0.60％，B：0.001％～0.002％，Pcm≤0.26％，其余部分为Fe和杂质。The present invention aims at the above technical problems, overcomes the shortcomings of the prior art, and provides a 1000MPa grade quenched and tempered steel plate for hydropower, its chemical composition and weight percentage are: C: 0.08%-0.11%, Mn: 1.00%-1.50%, Si: 0.10%～0.50%, P≤0.012%, S≤0.003%, Alt: 0.050%～0.080%, V: 0.040%～0.060%, Ti: 0.008%～0.020%, Ni: 1.00%～1.70%, Cr: 0.30%-0.60%, Mo: 0.40%-0.60%, B: 0.001%-0.002%, Pcm≤0.26%, and the rest is Fe and impurities.
本发明进一步限定的技术方案是：The technical scheme further defined in the present invention is:
前所述的一种1000MPa级调质型水电用钢板，其化学成分及重量百分比为：C：0.08％～0.10％，Mn：1.20％～1.50％，Si：0.15％～0.50％，P≤0.012％，S≤0.003％，Alt：0.050％～0.070％，V：0.040％～0.060％，Ti：0.008％～0.020％，Ni：1.00％～1.20％，Cr：0.30％～0.60％，Mo：0.40％～0.60％，B：0.001％～0.002％，Pcm≤0.25％，其余部分为Fe和杂质。The aforementioned 1000MPa grade quenched and tempered steel plate for hydroelectricity, its chemical composition and weight percentage are: C: 0.08%-0.10%, Mn: 1.20%-1.50%, Si: 0.15%-0.50%, P≤0.012 %, S≤0.003%, Alt: 0.050%～0.070%, V: 0.040%～0.060%, Ti: 0.008%～0.020%, Ni: 1.00%～1.20%, Cr: 0.30%～0.60%, Mo: 0.40 %～0.60%, B: 0.001%～0.002%, Pcm≤0.25%, and the rest is Fe and impurities.
前所述的一种1000MPa级调质型水电用钢板，其化学成分及重量百分比为：C：0.10％～0.11％，Mn：1.00％～1.20％，Si：0.20％～0.50％，P≤0.012％，S≤0.003％，Alt：0.050％～0.070％，V：0.040％～0.060％，Ti：0.008％～0.020％，Ni：1.21％～1.70％，Cr：0.40％～0.60％，Mo：0.40％～0.60％，B：0.001％～0.002％，Pcm≤0.26％，其余部分为Fe和杂质。The aforementioned 1000MPa grade quenched and tempered steel plate for hydroelectricity, its chemical composition and weight percentage are: C: 0.10% to 0.11%, Mn: 1.00% to 1.20%, Si: 0.20% to 0.50%, P≤0.012 %, S≤0.003%, Alt: 0.050%～0.070%, V: 0.040%～0.060%, Ti: 0.008%～0.020%, Ni: 1.21%～1.70%, Cr: 0.40%～0.60%, Mo: 0.40 %～0.60%, B: 0.001%～0.002%, Pcm≤0.26%, and the rest is Fe and impurities.
本发明的另一目的在于提供一种1000MPa级调质型水电用钢板的生产方法，包括炼钢工序、坯料加热工序、轧制工序、热处理工序，具体为：Another object of the present invention is to provide a production method of 1000MPa grade quenched and tempered steel plate for hydropower, including steelmaking process, billet heating process, rolling process, heat treatment process, specifically:
炼钢工序：按照设计的化学成分冶炼钢水并连铸成板坯，连铸采用动态轻压下、电磁搅拌技术，连铸板坯中心偏析在C1.0级以下；Steelmaking process: Smelt molten steel according to the designed chemical composition and continuously cast it into slabs. The continuous casting adopts dynamic light reduction and electromagnetic stirring technology, and the center segregation of the continuous casting slab is below C1.0 level;
加热工序：铸坯入加热炉加热，加热系数10.0～14.0min/cm，加热温度1180～1220℃，保证铸坯加热均匀性；Heating process: the slab is heated in a heating furnace, the heating coefficient is 10.0-14.0min/cm, and the heating temperature is 1180-1220°C to ensure the heating uniformity of the slab;
轧制工序：采用两阶段控轧工艺，第一阶段总压下率≥60％，轧制终了温度≥1000℃；第二阶段采用低温轧制技术，开轧温度840～880℃，终轧温度810～850℃，第一阶段总压下率≥40％；轧制后的钢板在空气中冷却至室温；Rolling process: two-stage controlled rolling process is adopted, the total reduction rate in the first stage is ≥60%, and the final rolling temperature is ≥1000°C; 810～850℃, the total reduction rate in the first stage is ≥40%; the rolled steel plate is cooled to room temperature in air;
热处理工序：钢板入炉进行离线调质热处理，其中淬火温度880～930℃，在炉时间1.5～2.0min/mm；回火温度600～640℃，在炉时间2.5～4.0min/mm。Heat treatment process: the steel plate is put into the furnace for off-line quenching and tempering heat treatment, wherein the quenching temperature is 880-930°C, and the time in the furnace is 1.5-2.0min/mm; the tempering temperature is 600-640°C, and the time in the furnace is 2.5-4.0min/mm.
前所述的一种1000MPa级调质型水电用钢板的生产方法，钢板最大厚度为56mm。In the aforementioned production method of a 1000MPa grade quenched and tempered steel plate for hydropower, the maximum thickness of the steel plate is 56 mm.
前所述的一种1000MPa级调质型水电用钢板的生产方法，钢板金相组织为回火索氏体及少量回火马氏体。In the aforementioned production method of a 1000MPa grade quenched and tempered steel plate for hydropower, the metallographic structure of the steel plate is tempered sorbite and a small amount of tempered martensite.
本发明的有益效果是：The beneficial effects of the present invention are:
(1)本发明采用低碳包晶钢、Ni+Cr+Mo合金化设计，V+Ti微合金化，以及较高Al元素、微量B元素共同作用来提高钢板淬透性，不添加Nb、Cu等合金，在保证性能的基础上，结合化学成分中C、Si、Mn、Al、V、Ti、B、Ni、Cr、Mo等基础元素对于改善钢种强度和影响钢种韧性的综合作用；(1) The present invention adopts low-carbon peritectic steel, Ni+Cr+Mo alloying design, V+Ti microalloying, and higher Al elements and trace B elements to improve the hardenability of the steel plate without adding Nb, Cu and other alloys, on the basis of ensuring performance, combine the comprehensive effects of basic elements such as C, Si, Mn, Al, V, Ti, B, Ni, Cr, Mo in the chemical composition to improve the strength of steel grades and affect the toughness of steel grades ;
(2)本发明中两阶段控制轧制后钢板在空气中冷却，最后经离线淬火+高温回火热处理后，获得了一种1000MPa级调质型水电用钢板，钢板最大厚度达56mm，性能达到屈服强度≥885MPa,抗拉强度950～1130MPa，钢板-60℃横向低温冲击功≥100J；(2) In the present invention, after the two-stage controlled rolling, the steel plate is cooled in the air, and finally after off-line quenching + high temperature tempering heat treatment, a 1000MPa grade quenched and tempered steel plate for hydropower is obtained. The maximum thickness of the steel plate reaches 56mm, and the performance reaches Yield strength ≥ 885MPa, tensile strength 950 ~ 1130MPa, steel plate -60 ℃ transverse low temperature impact energy ≥ 100J;
(3)本发明中由于低碳含量、焊接冷裂纹敏感系数Pcm≤0.26％，可实现钢板的较低预热温度使用，提高了水电工程项目施工现场的焊接质量和焊接效率；(3) Due to the low carbon content and welding cold crack sensitivity coefficient Pcm≤0.26% in the present invention, the use of lower preheating temperature of the steel plate can be realized, and the welding quality and welding efficiency at the construction site of the hydropower project are improved;
(4)本发明对生产装备要求不高，生产工艺简单，可实现钢板的高效生产，经济效益好，预计吨钢毛利1000元/吨以上；(4) The present invention has low requirements on production equipment, simple production process, high-efficiency production of steel plates, and good economic benefits. The estimated gross profit per ton of steel is more than 1,000 yuan/ton;
(5)本发明中通过添加较高的Al元素(0.05％～0.08％)和Ti元素一起， 减缓B的氮化过程，阻碍BN的析出，充分发挥自由硼在原始奥氏体晶界析出，从而提高钢板淬透性，实现了降低C含量至0.12％以下、减少合金种类和含量的情况下，仍可获得了较高强度。(5) In the present invention, by adding higher Al elements (0.05% to 0.08%) together with Ti elements, the nitriding process of B is slowed down, the precipitation of BN is hindered, and free boron is fully utilized to precipitate at the prior austenite grain boundary, Therefore, the hardenability of the steel plate is improved, the C content is reduced to less than 0.12%, and the type and content of the alloy are reduced, and a higher strength can still be obtained.
附图说明Description of drawings
图1为实施例3钢板1/4厚度的显微组织。Fig. 1 is the microstructure of 1/4 thickness of the steel plate of embodiment 3.
具体实施方式detailed description
实施例1Example 1
本实施例提供的一种1000MPa级调质型水电用钢板的生产方法，厚度为24mm，包括炼钢工序、坯料加热工序、轧制工序、热处理工序，具体为：The production method of a 1000MPa grade quenched and tempered steel plate for hydropower provided in this embodiment has a thickness of 24 mm, including a steelmaking process, a billet heating process, a rolling process, and a heat treatment process, specifically:
炼钢工序：成分含量(wt)为：C：0.09％、Mn：1.34％、P：0.008％、S：0.002％、Si：0.21％、Alt：0.056％、V：0.047％、Ti：0.015％、Ni：1.18％、Cr：0.51％、Mo：0.51％、B：0.0011％，Pcm：0.25％，其余为Fe和杂质，按照上述成分冶炼，连铸工艺采用动态轻压下、电磁搅拌技术，浇注为260mm连铸板坯，铸坯中心偏析C1.0级；Steelmaking process: component content (wt): C: 0.09%, Mn: 1.34%, P: 0.008%, S: 0.002%, Si: 0.21%, Alt: 0.056%, V: 0.047%, Ti: 0.015% , Ni: 1.18%, Cr: 0.51%, Mo: 0.51%, B: 0.0011%, Pcm: 0.25%, the rest is Fe and impurities, smelted according to the above ingredients, and the continuous casting process adopts dynamic light reduction and electromagnetic stirring technology. Casting is 260mm continuous casting slab, and the center segregation of the casting slab is C1.0 grade;
加热工序：加热工艺为其钢坯的加热系数10.8min/cm，加热温度1187℃；Heating process: the heating process is that the heating coefficient of the billet is 10.8min/cm, and the heating temperature is 1187°C;
轧制工序：采用两阶段控轧工艺，第一阶段总压下率≥70％，轧制终了温度1022℃；第二阶段开轧温度为878℃，终轧温度为836℃，第二阶段总压下率≥60％；轧制后的钢板在空气中冷却；Rolling process: Two-stage controlled rolling process is adopted, the total reduction rate in the first stage is ≥70%, and the final rolling temperature is 1022°C; the starting rolling temperature in the second stage is 878°C, and the final rolling temperature is 836°C The reduction rate is ≥60%; the rolled steel plate is cooled in the air;
热处理工序：钢板入炉进行离线调质热处理，其中淬火温度895℃，在炉时间41min；回火温度631℃，在炉时间82min；Heat treatment process: the steel plate is put into the furnace for off-line quenching and tempering heat treatment, wherein the quenching temperature is 895°C, and the time in the furnace is 41 minutes; the tempering temperature is 631°C, and the time in the furnace is 82 minutes;
本24mm规格1000MPa级调质型水电用钢板，力学性能为：屈服强度964MPa，抗拉强度979MPa，断后伸长率17％，-60℃横向冲击功Akv：141、136、186J。The mechanical properties of this 24mm specification 1000MPa grade quenched and tempered steel plate for hydropower are: yield strength 964MPa, tensile strength 979MPa, elongation after fracture 17%, and transverse impact energy Akv at -60°C: 141, 136, 186J.
实施例2Example 2
本实施例提供的一种1000MPa级调质型水电用钢板的生产方法，厚度为48mm，包括炼钢工序、坯料加热工序、轧制工序、热处理工序，具体为：The production method of a 1000MPa grade quenched and tempered steel plate for hydropower provided in this embodiment has a thickness of 48mm, including a steelmaking process, a billet heating process, a rolling process, and a heat treatment process, specifically:
炼钢工序：成分含量(wt)为：C：0.10％、Mn：1.17％、P：0.007％、S：0.003％、Si：0.23％、Alt：0.052％、V：0.051％、Ti：0.013％、Ni：1.25％、Cr：0.53％、Mo：0.47％、B：0.0015％，Pcm：0.26％，其余为Fe和杂质，按照上述成分冶炼，连铸工艺采用动态轻压下、电磁搅拌技术，浇注为320mm连铸板坯，铸坯中心偏析C0.5级；Steelmaking process: component content (wt): C: 0.10%, Mn: 1.17%, P: 0.007%, S: 0.003%, Si: 0.23%, Alt: 0.052%, V: 0.051%, Ti: 0.013% , Ni: 1.25%, Cr: 0.53%, Mo: 0.47%, B: 0.0015%, Pcm: 0.26%, the rest is Fe and impurities, smelted according to the above ingredients, and the continuous casting process adopts dynamic light reduction and electromagnetic stirring technology. Casting is 320mm continuous casting slab, and the slab center segregation is C0.5 grade;
加热工序：加热工艺为其钢坯的加热系数11.7min/cm，加热温度1204℃；Heating process: the heating process is that the heating coefficient of the billet is 11.7min/cm, and the heating temperature is 1204°C;
轧制工序：采用两阶段控轧工艺，第一阶段总压下率≥60％，轧制终了温度1019℃；第二阶段开轧温度为851℃，终轧温度为825℃，第二阶段总压下率≥50％；轧制后的钢板在空气中冷却；Rolling process: two-stage controlled rolling process is adopted, the total reduction rate in the first stage is ≥60%, and the final rolling temperature is 1019°C; the starting rolling temperature in the second stage is 851°C, and the final rolling temperature is 825°C The reduction rate is ≥50%; the rolled steel plate is cooled in the air;
热处理工序：钢板入炉进行离线调质热处理，其中淬火温度901℃，在炉时间88min；回火热处理，回火温度618℃，在炉时间153min。Heat treatment process: the steel plate is put into the furnace for off-line quenching and tempering heat treatment, in which the quenching temperature is 901°C, and the time in the furnace is 88 minutes; tempering heat treatment, the tempering temperature is 618°C, and the time in the furnace is 153 minutes.
本48mm规格1000MPa级调质型水电用钢板，力学性能为：屈服强度911MPa，抗拉强度986MPa，断后伸长率17.5％，-60℃横向冲击功Akv：106、111、122J。The mechanical properties of this 48mm specification 1000MPa grade quenched and tempered steel plate for hydropower are: yield strength 911MPa, tensile strength 986MPa, elongation after fracture 17.5%, and transverse impact energy Akv at -60°C: 106, 111, 122J.
实施例3Example 3
本实施例提供的一种1000MPa级调质型水电用钢板的生产方法，厚度为56mm，包括炼钢工序、坯料加热工序、轧制工序、热处理工序，具体为：The production method of a 1000MPa grade quenched and tempered steel plate for hydroelectricity provided in this embodiment has a thickness of 56 mm, including a steelmaking process, a billet heating process, a rolling process, and a heat treatment process, specifically:
炼钢工序：成分含量(wt)为：C：0.11％、Mn：1.03％、P：0.006％、S：0.001％、Si：0.18％、Alt：0.063％、V：0.058％、Ti：0.016％、Ni：1.52％、Cr：0.48％、Mo：0.44％、B：0.0013％,Pcm：0.26％，其余为Fe和杂质，按照上述成分冶炼，连铸工艺采用动态轻压下、电磁搅拌技术，浇注为260mm连铸板坯，铸坯中心偏析C1.0级；Steelmaking process: component content (wt): C: 0.11%, Mn: 1.03%, P: 0.006%, S: 0.001%, Si: 0.18%, Alt: 0.063%, V: 0.058%, Ti: 0.016% , Ni: 1.52%, Cr: 0.48%, Mo: 0.44%, B: 0.0013%, Pcm: 0.26%, the rest is Fe and impurities, smelted according to the above ingredients, and the continuous casting process adopts dynamic light reduction and electromagnetic stirring technology. Casting is 260mm continuous casting slab, and the center segregation of the casting slab is C1.0 grade;
加热工序：加热工艺为其钢坯的加热系数11.3min/cm，加热温度1209℃；Heating process: the heating process is that the heating coefficient of the billet is 11.3min/cm, and the heating temperature is 1209°C;
轧制工序：采用两阶段控轧工艺，第一阶段总压下率≥60％，轧制终了温度1017℃；第二阶段开轧温度为832℃，终轧温度为813℃，第二阶段总压下率≥40％；轧制后的钢板在空气中冷却；Rolling process: two-stage controlled rolling process is adopted, the total reduction ratio in the first stage is ≥60%, and the final rolling temperature is 1017°C; the starting rolling temperature in the second stage is 832°C, and the final rolling temperature is 813°C The reduction rate is ≥40%; the rolled steel plate is cooled in the air;
热处理工序：钢板入炉进行离线调质热处理，其中淬火温度913℃，在炉时间102min；回火热处理，回火温度607℃，在炉时间175min。Heat treatment process: the steel plate is put into the furnace for off-line quenching and tempering heat treatment, wherein the quenching temperature is 913°C, and the time in the furnace is 102 minutes; tempering heat treatment, the tempering temperature is 607°C, and the time in the furnace is 175 minutes.
本56mm规格1000MPa级调质型水电用钢板，力学性能为：屈服强度975MPa，抗拉强度990MPa，断后伸长率15.5％，-60℃横向冲击功Akv：107、147、150J。The mechanical properties of this 56mm specification 1000MPa grade quenched and tempered steel plate for hydropower are: yield strength 975MPa, tensile strength 990MPa, elongation after fracture 15.5%, and transverse impact energy Akv at -60°C: 107, 147, 150J.
从实施例1～3可以看出，本发明56mm及以下厚度1000MPa级调质型水电用钢板，如图1，钢板金相组织为回火索氏体及少量回火马氏体，其屈服强度在911～975MPa，抗拉强度在979～990MPa，断后伸长率在15.5％～17.5％之间，-60℃横向冲击功不小于100J。It can be seen from Examples 1 to 3 that the 56mm and below thickness 1000MPa grade quenched and tempered steel sheets for hydropower of the present invention, as shown in Figure 1, the steel plate metallographic structure is tempered sorbite and a small amount of tempered martensite, and its yield strength At 911~975MPa, the tensile strength is 979~990MPa, the elongation after breaking is between 15.5%~17.5%, and the transverse impact energy at -60°C is not less than 100J.
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。In addition to the above-mentioned embodiments, the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims (6)

  1. 一种1000MPa级调质型水电用钢板，其特征在于：其化学成分及重量百分比为：C：0.08％～0.11％，Mn：1.00％～1.50％，Si：0.10％～0.50％，P≤0.012％，S≤0.003％，Alt：0.050％～0.080％，V：0.040％～0.060％，Ti：0.008％～0.020％，Ni：1.00％～1.70％，Cr：0.30％～0.60％，Mo：0.40％～0.60％，B：0.001％～0.002％，Pcm≤0.26％，其余部分为Fe和杂质。A 1000MPa grade quenched and tempered steel plate for hydropower, characterized in that its chemical composition and weight percentage are: C: 0.08% to 0.11%, Mn: 1.00% to 1.50%, Si: 0.10% to 0.50%, P≤0.012 %, S≤0.003%, Alt: 0.050%～0.080%, V: 0.040%～0.060%, Ti: 0.008%～0.020%, Ni: 1.00%～1.70%, Cr: 0.30%～0.60%, Mo: 0.40 %～0.60%, B: 0.001%～0.002%, Pcm≤0.26%, and the rest is Fe and impurities.
  2. 根据权利要求1所述的一种1000MPa级调质型水电用钢板，其特征在于：其化学成分及重量百分比为：C：0.08％～0.10％，Mn：1.20％～1.50％，Si：0.15％～0.50％，P≤0.012％，S≤0.003％，Alt：0.050％～0.070％，V：0.040％～0.060％，Ti：0.008％～0.020％，Ni：1.00％～1.20％，Cr：0.30％～0.60％，Mo：0.40％～0.60％，B：0.001％～0.002％，Pcm≤0.25％，其余部分为Fe和杂质。A 1000MPa grade quenched and tempered steel plate for hydropower according to claim 1, characterized in that its chemical composition and weight percentage are: C: 0.08%-0.10%, Mn: 1.20%-1.50%, Si: 0.15% ~0.50%, P≤0.012%, S≤0.003%, Alt: 0.050% ~ 0.070%, V: 0.040% ~ 0.060%, Ti: 0.008% ~ 0.020%, Ni: 1.00% ~ 1.20%, Cr: 0.30% ~0.60%, Mo: 0.40%~0.60%, B: 0.001%~0.002%, Pcm≤0.25%, and the rest is Fe and impurities.
  3. 根据权利要求1所述的一种1000MPa级调质型水电用钢板，其特征在于：其化学成分及重量百分比为：C：0.10％～0.11％，Mn：1.00％～1.20％，Si：0.20％～0.50％，P≤0.012％，S≤0.003％，Alt：0.050％～0.070％，V：0.040％～0.060％，Ti：0.008％～0.020％，Ni：1.21％～1.70％，Cr：0.40％～0.60％，Mo：0.40％～0.60％，B：0.001％～0.002％，Pcm≤0.26％，其余部分为Fe和杂质。A 1000MPa grade quenched and tempered steel plate for hydropower according to claim 1, characterized in that its chemical composition and weight percentage are: C: 0.10%-0.11%, Mn: 1.00%-1.20%, Si: 0.20% ~0.50%, P≤0.012%, S≤0.003%, Alt: 0.050% ~ 0.070%, V: 0.040% ~ 0.060%, Ti: 0.008% ~ 0.020%, Ni: 1.21% ~ 1.70%, Cr: 0.40% ~0.60%, Mo: 0.40%~0.60%, B: 0.001%~0.002%, Pcm≤0.26%, and the rest is Fe and impurities.
  4. 一种1000MPa级调质型水电用钢板的生产方法，其特征在于：应用于权利要求1-3任意一项，包括炼钢工序、坯料加热工序、轧制工序、热处理工序，具体为：A method for producing a 1000MPa-level quenched and tempered steel plate for hydropower, characterized in that it is applied to any one of claims 1-3, including a steelmaking process, a billet heating process, a rolling process, and a heat treatment process, specifically:
    炼钢工序：按照设计的化学成分冶炼钢水并连铸成板坯，连铸采用动态轻压下、电磁搅拌技术，连铸板坯中心偏析在C1.0级以下；Steelmaking process: Smelt molten steel according to the designed chemical composition and continuously cast it into slabs. The continuous casting adopts dynamic light reduction and electromagnetic stirring technology, and the center segregation of the continuous casting slab is below C1.0 level;
    加热工序：铸坯入加热炉加热，加热系数10.0～14.0min/cm，加热温度1180～1220℃，保证铸坯加热均匀性；Heating process: the slab is heated in a heating furnace, the heating coefficient is 10.0-14.0min/cm, and the heating temperature is 1180-1220°C to ensure the heating uniformity of the slab;
    轧制工序：采用两阶段控轧工艺，第一阶段总压下率≥60％，轧制终了温度≥1000℃；第二阶段采用低温轧制技术，开轧温度840～880℃，终轧温度810～850℃，第一阶段总压下率≥40％；轧制后的钢板在空气中冷却至室温；Rolling process: two-stage controlled rolling process is adopted, the total reduction rate in the first stage is ≥60%, and the final rolling temperature is ≥1000°C; 810～850℃, the total reduction rate in the first stage is ≥40%; the rolled steel plate is cooled to room temperature in air;
    热处理工序：钢板入炉进行离线调质热处理，其中淬火温度880～930℃，在炉时间1.5～2.0min/mm；回火温度600～640℃，在炉时间2.5～4.0min/mm。Heat treatment process: the steel plate is put into the furnace for off-line quenching and tempering heat treatment, wherein the quenching temperature is 880-930°C, and the time in the furnace is 1.5-2.0min/mm; the tempering temperature is 600-640°C, and the time in the furnace is 2.5-4.0min/mm.
  5. 根据权利要求4所述的一种1000MPa级调质型水电用钢板的生产方法，其特征在于：钢板最大厚度为56mm。The production method of a 1000MPa grade quenched and tempered steel plate for hydropower according to claim 4, characterized in that: the maximum thickness of the steel plate is 56mm.
  6. 根据权利要求4所述的一种1000MPa级调质型水电用钢板的生产方法，其特征在于：钢板金相组织为回火索氏体及少量回火马氏体。The production method of a 1000MPa quenched and tempered steel sheet for hydropower according to claim 4, characterized in that: the metallographic structure of the steel sheet is tempered sorbite and a small amount of tempered martensite.
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