WO2023000584A1 - Plaque d'acier hydroélectrique trempé et revenu de qualité 1000 mpa et son procédé de production - Google Patents

Plaque d'acier hydroélectrique trempé et revenu de qualité 1000 mpa et son procédé de production 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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English (en)
Chinese (zh)
Inventor
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

La présente invention concerne le domaine technique de la production d'acier. Sont divulgués une plaque d'acier hydroélectrique trempé et revenu de qualité 1000 MPa et son procédé de production, comprenant les composants chimiques suivants en pourcentage en poids : C : 0,08 % à 0,11 % ; Mn : 1,00 % à 1,50 % ; Si : 0,10 % à 0,50 % ; P ≤ 0,012 % ; S ≤ 0,003 % ; Alt : 0,050 % à 0,080 % ; V : 0,040 % à 0,060 % ; Ti : 0,008 % à 0,020 % ; Ni : 1,00 % à 1,70 % ; Cr : 0,30 % à 0,60 % ; Mo : 0,40 % à 0,60 % ; B : 0,001 % à 0,002 % ; Pcm ≤ 0,26 % ; et le reste étant du Fe et des impuretés. La plaque d'acier hydroélectrique trempé et revenu de qualité 1000 MPa est obtenue, l'épaisseur maximale de la plaque d'acier atteint 56 mm, la limite d'élasticité est supérieure ou égale à 885 MPa, et la résistance à la traction est de 950 à 1 130 MPa. L'énergie d'impact transversal à basse température de la plaque d'acier à une température de -60 °C est supérieure ou égale à 100 J. Puisque la teneur en carbone est faible et le coefficient de sensibilité à la fissuration à froid de soudage Pcm est inférieur ou égal à 0,26 %, la plaque d'acier peut être utilisée à une température de préchauffage faible, et la qualité de soudage et l'efficacité de soudage d'un site de construction de projet d'ingénierie hydraulique sont améliorées.
PCT/CN2021/136684 2021-07-23 2021-12-09 Plaque d'acier hydroélectrique trempé et revenu de qualité 1000 mpa et son procédé de production WO2023000584A1 (fr)

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CN202110837117.5A CN113652607A (zh) 2021-07-23 2021-07-23 一种1000MPa级调质型水电用钢板及其生产方法
CN202110837117.5 2021-07-23

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CN113652607A (zh) * 2021-07-23 2021-11-16 南京钢铁股份有限公司 一种1000MPa级调质型水电用钢板及其生产方法
CN114134301B (zh) * 2021-11-24 2023-11-03 南京钢铁股份有限公司 一种1000MPa级水电用钢板的两火次轧制方法
CN114293110B (zh) * 2022-01-07 2023-03-03 鞍钢股份有限公司 一种厚规格800MPa级水电钢及其高效低成本生产方法
CN115961202A (zh) * 2022-12-05 2023-04-14 南京钢铁股份有限公司 一种大于100mm厚1000MPa级水电用钢板的生产方法

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