WO2024088056A1 - Acier q550d à faible coût produit par tmcp et son procédé de production - Google Patents

Acier q550d à faible coût produit par tmcp et son procédé de production Download PDF

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WO2024088056A1
WO2024088056A1 PCT/CN2023/123722 CN2023123722W WO2024088056A1 WO 2024088056 A1 WO2024088056 A1 WO 2024088056A1 CN 2023123722 W CN2023123722 W CN 2023123722W WO 2024088056 A1 WO2024088056 A1 WO 2024088056A1
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steel
cooling
temperature
rolling
controlled
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PCT/CN2023/123722
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English (en)
Chinese (zh)
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朱书成
郑海明
胡宏伟
李忠波
许少普
刘庆波
康文举
唐郑磊
杨阳
薛艳生
袁永旗
全微波
王勇
杨春
朱先兴
袁高俭
任义
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南阳汉冶特钢有限公司
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Publication of WO2024088056A1 publication Critical patent/WO2024088056A1/fr

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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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • 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
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention belongs to the technical field of wide and thick plate metallurgy, and specifically relates to a TMCP process for producing low-cost Q550D steel and a production method thereof.
  • Coal mine machinery mainly includes roadheaders, coal mining machines, scraper conveyors, and hydraulic supports, commonly known as "three machines and one frame".
  • hydraulic support equipment accounts for the highest proportion and is the largest equipment in all coal mining machinery products.
  • the 30-50mm Q550D high-strength steel currently produced domestically is mainly delivered through heat treatment, and requires the addition of precious Ni and Cu alloy elements, resulting in high production costs and long cycles.
  • the present disclosure provides a Q550D steel comprising the following chemical components in percentage by mass:
  • 0.13-0.16wt% C 0.10-0.25wt% Si, 1.40-1.60wt% Mn, ⁇ 0.015wt% P, ⁇ 0.003wt% S, 0.020-0.035wt% Als, 0.030-0.060wt% Nb, 0.40-0.60wt% Cr, 0.10-0.20wt% Mo, ⁇ 0.020wt% Ti, and 0.0010-0.0020wt% B, with the balance being Fe and residual elements.
  • the steel is a steel plate with a thickness of 30 to 50 mm.
  • the structure of the steel plate includes 50-60% bainite, 20-30% acicular ferrite and 10-20% pearlite.
  • the present disclosure also provides a low-cost Q550D steel, which is a steel plate with a thickness of 30 to 50 mm and contains the following chemical components in mass percentage:
  • 0.13-0.16wt% C 0.10-0.25wt% Si, 1.40-1.60wt% Mn, ⁇ 0.015wt% P, ⁇ 0.003wt% S, 0.020-0.035wt% Als, 0.030-0.060wt% Nb, 0.40-0.60wt% Cr, 0.10-0.20wt% Mo, ⁇ 0.020wt% Ti, and 0.0010-0.0020wt% B, with the balance being Fe and residual elements; and,
  • the structure of the steel plate is 50-60% bainite + 20-30% acicular ferrite + 10-20% pearlite, and its yield strength is ⁇ 550MPa, tensile strength is ⁇ 670MPa, elongation is ⁇ 17%, and longitudinal KV2 impact energy at -20°C is ⁇ 100J.
  • the present disclosure also provides a method for producing Q550D steel using the TMCP process, the method comprising smelting, casting, heating, TMCP controlled rolling and controlled cooling, and stack cooling steps; wherein the TMCP controlled rolling and controlled cooling step comprises two stages: rough rolling and finish rolling;
  • the rough rolling stage meets the following requirements: at least 5 reduction passes with a rate of ⁇ 15%, the thickness of the steel plate to be dried is 2 to 3 times the thickness of the finished steel plate, and the cumulative reduction rate is ⁇ 65%;
  • the finishing rolling stage meets the following requirements: at least 6 reduction pass rates ⁇ 10%, cumulative reduction rate ⁇ 60%, and when the finished steel thickness is ⁇ 30-40 mm, the finishing rolling start temperature is 770-790° C., the final rolling temperature is 760-780° C., the water entry temperature is 730 ⁇ 5° C., the cooling rate is controlled at 10-15° C./s, and the red-return temperature is 570 ⁇ 10° C.;
  • the starting temperature of the finishing rolling is 760-780°C
  • the final rolling temperature is 750-770°C
  • the water entering temperature is 725 ⁇ 5°C
  • the cooling rate is controlled at 7-12°C/s
  • the red-returning temperature is 550 ⁇ 10°C.
  • the TMCP controlled rolling and controlled cooling step also includes relaxing or air cooling the steel plate before entering the water, and the relaxation or air cooling time is 20S-60S; optionally, the relaxation or air cooling time is 30S-40S.
  • slow cooling pit stack cooling is used, the stack cooling temperature is ⁇ 400°C, and the stack cooling time is ⁇ 48h.
  • the present disclosure also provides a production method for producing low-cost Q550D steel by TMCP process, comprising the following steps: smelting, casting, heating, TMCP controlled rolling and controlled cooling, and stack cooling;
  • the TMCP controlled rolling and controlled cooling process requires that the rough rolling should ensure at least 5 reduction passes with a rate of ⁇ 15%, the steel thickness should be 2 to 3 times the thickness of the finished steel plate, and the cumulative reduction rate should be ⁇ 65%.
  • the finishing rolling should ensure at least 6 reduction passes with a rate of ⁇ 10%, and the cumulative reduction rate should be ⁇ 60%.
  • the process requirements are: when the finished steel thickness is ⁇ 30 to 40 mm, the finishing rolling start temperature is 770 to 790 ° C, the final rolling temperature is 760 to 780 ° C, the relaxation time is 30 s, the water entry temperature is 730 ⁇ 5 ° C, the cooling rate is controlled at 10 to 15 ° C / s, and the red return temperature is 570 ⁇ 10 ° C; when the finished steel thickness is ⁇ 40 to 50 mm, the finishing rolling start temperature is 760 to 780 ° C, the final rolling temperature is 750 to 770 ° C, the relaxation time is 40 s, the water entry temperature is 725 ⁇ 5 ° C, the cooling rate is controlled at 7 to 12 ° C / s, and the red return temperature is 550 ⁇ 10 ° C;
  • the stack cooling process requires that the steel plate be directly placed in a slow cooling pit for stack cooling after straightening, with a stack cooling temperature ⁇ 400°C and a stack cooling time ⁇ 48h.
  • the present disclosure also provides Q550D steel prepared by the above method.
  • the structure of the steel plate is 50-60% bainite+20-30% acicular ferrite+10-20% pearlite.
  • the steel plate has a yield strength of ⁇ 550MPa, a tensile strength of ⁇ 670MPa, and an elongation of ⁇ 17%, at -20°C Longitudinal KV2 impact energy ⁇ 100J.
  • FIG. 1 is a schematic diagram of the structure of a steel plate obtained in an embodiment of the present disclosure.
  • FIG. 2 is a schematic diagram of a high-magnification inspection of the steel plate structure obtained in an embodiment of the present disclosure.
  • Als used herein means acid-soluble aluminum.
  • the present disclosure provides a TMCP process for producing low-cost Q550D steel.
  • the steel plate provided by the present disclosure has a reasonable combination of chemical components, low alloy cost, and excellent low-temperature impact toughness, and can meet actual production, processing and use requirements.
  • the present disclosure also provides a production method for producing low-cost Q550D steel using a TMCP process.
  • the present disclosure provides a Q550D steel comprising the following chemical components in mass percentage:
  • 0.13-0.16wt% C 0.10-0.25wt% Si, 1.40-1.60wt% Mn, ⁇ 0.015wt% P, ⁇ 0.003wt% S, 0.020-0.035wt% Als, 0.030-0.060wt% Nb, 0.40-0.60wt% Cr, 0.10-0.20wt% Mo, ⁇ 0.020wt% Ti, and 0.0010-0.0020wt% B, with the balance being Fe and residual elements.
  • the components disclosed in the present invention adopt a medium carbon design. Under the premise of ensuring strength, the amount of alloy added is reduced, and the hardenability of the steel plate is enhanced by Cr and B. Mo shifts the pearlite transformation line in the CCT curve to the right, reduces the formation of pearlite, and expands the cooling rate range for the formation of acicular ferrite; while Cr is conducive to obtaining a bainite structure at a low cooling rate. With the increase of Mo and Cr content, the driving force for pearlite nucleation has decreased to a certain extent.
  • Mo in addition to delaying the nucleation and growth of pearlite, Mo can also increase the bonding force between solid solution atoms and reduce the self-diffusion coefficient of iron, thereby delaying the ⁇ - ⁇ transformation in the pearlite transformation, which is beneficial to the refinement of the structure and the improvement of precipitation strengthening and fine grain strengthening.
  • the present disclosure further provides a Q550D steel, which is a steel plate with a thickness of 30 to 50 mm.
  • the present disclosure further provides a Q550D steel, wherein the structure of the steel plate includes 50-60% bainite, 20-30% acicular ferrite, and 10-20% pearlite.
  • the present disclosure also provides a Q550D steel, which is a steel plate with a thickness of 30 to 50 mm, comprising the following chemical components in mass percentage:
  • 0.13-0.16wt% C 0.10-0.25wt% Si, 1.40-1.60wt% Mn, ⁇ 0.015wt% P, ⁇ 0.003wt% S, 0.020-0.035wt% Als, 0.030-0.060wt% Nb, 0.40-0.60wt% Cr, 0.10-0.20wt% Mo, ⁇ 0.020wt% Ti, and 0.0010-0.0020wt% B, with the balance being Fe and residual elements; and,
  • the structure of the steel plate is 50-60% bainite + 20-30% acicular ferrite + 10-20% pearlite, and its yield strength is ⁇ 550MPa, tensile strength is ⁇ 670MPa, elongation is ⁇ 17%, and longitudinal KV2 impact energy at -20°C is ⁇ 100J.
  • the present disclosure provides a TMCP process for producing low-cost Q550D steel and a production method thereof, wherein the steel plate has a thickness of 30 to 50 mm and contains the following chemical components in mass percentage (unit, wt%): 0.13 to 0.16 C, 0.10 to 0.25 Si, 1.40 to 1.60 Mn, ⁇ 0.015 P, ⁇ 0.003 S, 0.020 to 0.035 Als, 0.030 to 0.060 Nb, 0.40 to 0.60 Cr, 0.10 to 0.20 Mo, ⁇ 0.020 Ti, and 0.0010 to 0.0020 B, with the remainder being Fe and residual elements.
  • the structure of the steel plate is 50-60% bainite + 20-30% acicular ferrite + 10-20% pearlite, and its yield strength is ⁇ 550MPa, tensile strength is ⁇ 670MPa, elongation is ⁇ 17%, and longitudinal KV2 impact energy at -20°C is ⁇ 100J.
  • the present disclosure provides a method for producing Q550D steel using a TMCP process, the method comprising smelting, casting, heating, TMCP controlled rolling and controlled cooling, and stack cooling steps; wherein the TMCP controlled rolling and controlled cooling step comprises two stages of rough rolling and finishing rolling;
  • the rough rolling stage meets the following requirements: at least 5 reduction passes ⁇ 15%, the steel thickness is 2 to 3 times the thickness of the finished steel plate, and the cumulative reduction rate is ⁇ 65%
  • the finishing rolling stage meets the following requirements: at least 6 reduction pass rates ⁇ 10%, cumulative reduction rate ⁇ 60%, and when the finished steel thickness is ⁇ 30-40 mm, the finishing rolling start temperature is 770-790° C., the final rolling temperature is 760-780° C., the water entry temperature is 730 ⁇ 5° C., the cooling rate is controlled at 10-15° C./s, and the red-return temperature is 570 ⁇ 10° C.;
  • the starting temperature of the finishing rolling is 760-780°C
  • the final rolling temperature is 750-770°C
  • the water entering temperature is 725 ⁇ 5°C
  • the cooling rate is controlled at 7-12°C/s
  • the red-returning temperature is 550 ⁇ 10°C.
  • slow cooling pit stack cooling is used, the stack cooling temperature is ⁇ 400°C, and the stack cooling time is ⁇ 48h.
  • the TMCP controlled rolling and controlled cooling step also includes relaxing or air cooling the steel plate before entering the water, and the relaxation or air cooling time is 20S-60S; optionally, the relaxation or air cooling time is 30S-40S.
  • the present disclosure provides a method for producing low-cost Q550D steel by TMCP process, comprising: The process includes the following steps: smelting, casting, heating, TMCP controlled rolling and controlled cooling, and pile cooling;
  • the TMCP controlled rolling and controlled cooling process requires that the rough rolling should ensure at least 5 reduction passes with a rate of ⁇ 15%, the steel thickness should be 2 to 3 times the thickness of the finished steel plate, and the cumulative reduction rate should be ⁇ 65%.
  • the finishing rolling should ensure at least 6 reduction passes with a rate of ⁇ 10%, and the cumulative reduction rate should be ⁇ 60%.
  • the process requirements are: when the finished steel thickness is ⁇ 30 to 40 mm, the finishing rolling start temperature is 770 to 790 ° C, the final rolling temperature is 760 to 780 ° C, the relaxation time is 30 s, the water entry temperature is 730 ⁇ 5 ° C, the cooling rate is controlled at 10 to 15 ° C / s, and the red return temperature is 570 ⁇ 10 ° C; when the finished steel thickness is ⁇ 40 to 50 mm, the finishing rolling start temperature is 760 to 780 ° C, the final rolling temperature is 750 to 770 ° C, the relaxation time is 40 s, the water entry temperature is 725 ⁇ 5 ° C, the cooling rate is controlled at 7 to 12 ° C / s, and the red return temperature is 550 ⁇ 10 ° C;
  • the stack cooling process requires that the steel plate be directly placed in a slow cooling pit for stack cooling after straightening, with a stack cooling temperature ⁇ 400°C and a stack cooling time ⁇ 48h.
  • acicular ferrite is a product of the medium temperature transformation process formed by isothermal transformation at medium temperature or continuous cooling at a medium cooling rate.
  • the finishing process if the temperature is too high, grain boundary ferrite and intracrystalline equiaxed ferrite are formed. As the temperature decreases, the equiaxed ferrite gradually transforms into lath-shaped acicular ferrite. When the temperature is further reduced, bainite and ferrite are formed. Therefore, the finishing temperature must be accurately controlled.
  • the cooling rate affects the formation of acicular ferrite. If the cooling rate is too low, equiaxed ferrite and polygonal ferrite will be obtained; if the cooling rate is too high, bainite, ferrite, and even martensite will be obtained. Therefore, the red-return temperature and cooling rate must be accurately controlled to obtain more acicular ferrite and ensure that the impact energy of the steel plate meets the requirements.
  • the present disclosure provides a Q550D steel plate, which has a reasonable combination of chemical composition and matrix structure, can have both high strength and excellent low-temperature impact toughness, has low alloy cost, omits the heat treatment step in the production process, further reduces the manufacturing cost, and can meet the use and manufacturing of large coal mining machines and engineering machinery.
  • This embodiment provides a Q550D steel with a thickness of 40 mm, including the following chemical components in mass percentage:
  • the production method includes:
  • the S content of the molten iron is 0.008wt%; the C content of the converter steel is 0.08wt% and the P content is 0.010wt%; the slag thickness at the converter is ⁇ 16mm; the VD-determined [H] content is ⁇ 1.0PPm.
  • the liquidus temperature of molten steel is 1518°C, and the temperature of the tundish is controlled in the range of 1530 ⁇ 1535°C.
  • the first heating temperature of the steel billet is 960°C
  • the second heating temperature is 1210°C
  • the temperature of the soaking section is 1200°C.
  • the heating time is 270 minutes.
  • Controlled rolling Rough rolling with a steel thickness of 100 mm, finishing rolling at 780 ° C, final rolling at 765 ° C, and red-rolling at 560 ° C.
  • the specific pass distribution, reduction amount, and reduction rate are shown in Table 1.
  • the steel plate stack cooling temperature is 400°C and the stack cooling time is 48h.
  • the Q550D plate obtained in the embodiment is used as the test product.
  • the chemical composition, mechanical properties test piece sampling position and sample preparation of the steel plate are tested according to the standard "GB/T2975".
  • the low temperature impact toughness test is tested according to the standard "GB/T229”
  • the tensile property test is tested according to the standard "GB/T228”
  • the bending property test is tested according to the standard "GB/T232”.
  • Table 2 The test results are shown in Table 2 below:
  • the chemical composition, production process, and internal organization of the Q55D steel plate provided by the present disclosure are reasonable, and can have good mechanical properties and welding properties at the same time. Its production method meets the organizational production of the metallurgical industry and can It can reach the quality of Q550D steel and improve its performance.
  • the present invention provides a Q550D steel and a production method thereof.
  • the production method adopts the TMCP process.
  • the obtained Q550D steel has high strength and excellent low-temperature impact toughness, and has excellent industrial applicability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

La présente divulgation se rapporte au domaine technique de la métallurgie des tôles larges et épaisses et, en particulier, à l'acier Q550D à faible coût produit par TMCP et à son procédé de production. Dans la présente divulgation, une conception à moyen carbone est utilisée pour des constituants d'une tôle d'acier de sorte à réduire la quantité d'addition d'un alliage tandis que la résistance est assurée ; la réduction, la température et la vitesse de refroidissement sont régulées avec précision au cours du laminage et du refroidissement, de sorte sorte à omettre un processus de traitement thermique ; l'acier Q550D obtenu présente 50 à 60 % de bainite, 20 à 30 % de ferrite aciculaire et 10 à 20 % de structure perlitique, présente une composition chimique raisonnable et une combinaison de structure matricielle, permet d'obtenir obtenir à la fois une résistance élevée et une excellente ténacité aux chocs à basse température et permet d'obtenir des coûts d'alliage faibles ; un traitement thermique est omis pendant la production de sorte à réduire davantage les coûts de fabrication, et à pouvoir satisfaire les exigences d'utilisation et de fabrication pour de grandes machines d'exploitation minière du charbon et de machines du génie civil.
PCT/CN2023/123722 2022-10-28 2023-10-10 Acier q550d à faible coût produit par tmcp et son procédé de production WO2024088056A1 (fr)

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CN116043104B (zh) * 2022-10-28 2024-06-18 南阳汉冶特钢有限公司 一种tmcp工艺生产低成本q550d钢及其生产方法

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CN116043104A (zh) * 2022-10-28 2023-05-02 南阳汉冶特钢有限公司 一种tmcp工艺生产低成本q550d钢及其生产方法

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