WO2022142101A1 - Plaque d'acier d'impact à haute ténacité et à haute résistance au vieillissement et son procédé de fabrication - Google Patents

Plaque d'acier d'impact à haute ténacité et à haute résistance au vieillissement et son procédé de fabrication Download PDF

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Publication number
WO2022142101A1
WO2022142101A1 PCT/CN2021/096176 CN2021096176W WO2022142101A1 WO 2022142101 A1 WO2022142101 A1 WO 2022142101A1 CN 2021096176 W CN2021096176 W CN 2021096176W WO 2022142101 A1 WO2022142101 A1 WO 2022142101A1
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WO
WIPO (PCT)
Prior art keywords
steel plate
toughness
aging impact
iron
balance
Prior art date
Application number
PCT/CN2021/096176
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English (en)
Chinese (zh)
Inventor
冯勇
吴俊平
靳星
徐椿森
倪卫莹
刘继宏
潘中德
胡其龙
Original Assignee
南京钢铁股份有限公司
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Application filed by 南京钢铁股份有限公司 filed Critical 南京钢铁股份有限公司
Publication of WO2022142101A1 publication Critical patent/WO2022142101A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • C22C38/02—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
    • C22C38/04—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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • the invention relates to the technical field of iron and steel production, in particular to a high-toughness and high-aging impact steel plate and a manufacturing method thereof.
  • the present invention overcomes the shortcomings of the prior art, and provides a high-toughness and high-aging impact steel plate, whose chemical composition and mass percentage are as follows: C: 0.12% to 0.22%, Si: 0.10% to 0.60%, Mn: 1.15% ⁇ 1.60%, P ⁇ 0.020%, S ⁇ 0.015%,
  • Nb 0%-0.060%
  • Ti 0%-0.12%
  • Al 0.010%-0.050%
  • the balance is iron and inevitable impurity elements.
  • the chemical composition and mass percentage of the aforementioned high toughness and high aging impact steel sheet are as follows: C: 0.16%, Si: 0.29%, Mn: 1.58%, P: 0.011%, S: 0.002%, Nb: 0.036% , Ti: 0.015%, Al: 0.026%, the remainder is iron and inevitable impurity elements.
  • the chemical composition and mass percentage of the aforementioned high-toughness and high-aging impact steel sheet are as follows: C: 0.17%, Si: 0.26%, Mn: 1.55%, P: 0.012%, S: 0.002%, Nb: 0.026% , Ti: 0.017%, Al: 0.032%, the balance is iron and inevitable impurity elements.
  • the chemical composition and mass percentage of the aforementioned high toughness and high aging impact steel sheet are as follows: C: 0.16%, Si: 0.29%, Mn: 1.56%, P: 0.011%, S: 0.001%, Nb: 0.027% , Ti: 0.019%, Al: 0.025%, and the balance is iron and inevitable impurity elements.
  • the chemical composition and mass percentage of the aforementioned high toughness and high aging impact steel sheet are as follows: C: 0.13%, Si: 0.23%, Mn: 1.53%, P: 0.013%, S: 0.001%, Nb: 0.019% , Al: 0.030%, the remainder is iron and inevitable impurity elements.
  • the aforementioned high-toughness and high-aging impact steel plate has a thickness of 6-80 mm, and the structure of the steel plate is a uniform and fine ferrite-pearlite structure.
  • Another object of the present invention is to provide a method for manufacturing a high-toughness and high-aging impact steel plate, which specifically includes the following steps:
  • Hot metal pretreatment S ⁇ 0.010%; after BOF smelting furnace, deoxidation alloying is more than 90%; LF refining outside the furnace for 15-30 minutes, fine-tuning alloy composition and molten steel temperature; RH vacuum degassing treatment for 15-30 minutes, RH bottom blowing Argon is stirred reasonably and floated to remove non-metallic inclusions to reduce the content of nitrogen, hydrogen and oxygen; calcium wire is fed to purify molten steel to spheroidize non-metallic inclusions; the whole process of argon protection is poured, the pulling speed is 0.75-1.3m/min, and electromagnetic stirring;
  • the slab is then uniformly heated at 1100 ⁇ 1220°C, and the heating time is 3.5 ⁇ 4.5 hours;
  • rolling reduction ratio is greater than 60%
  • rough rolling temperature is 1070-1180 °C
  • second-stage rolling temperature is 890-950 °C
  • final rolling temperature is 800-880 °C;
  • the present invention has developed a new type of pure steel, which is mainly used in the manufacture of offshore engineering structures, which can withstand the complex stress of the ocean at a low temperature of -40°C, with a minimum yield strength of 345MPa and a low temperature -40°C toughness. Good, excellent aging performance, good welding performance, low carbon equivalent;
  • the composition is designed to be low-carbon microalloying, and refining is carried out to remove inclusions, nitrogen and hydrogen gases are removed, and uniform and fine microstructures are obtained, and high low temperature toughness and strain aging impact toughness are obtained, especially -40°C low temperature. Impact toughness and 5% strain aging impact performance, uniform structure and superior performance;
  • the present invention is mainly used as an export material, promotes the manufacture of offshore engineering structures, ensures the construction, installation and operation safety of offshore engineering structures. efficiency;
  • the present invention is conducive to promoting the upgrading of metallurgical products and marine structural products in my country, promoting the quality improvement of marine steel products with a large amount of applications and a wide range of applications, and promoting the exploitation and utilization of seabed resources, and has broad prospects for quality and benefit development.
  • This embodiment provides an 80mm specification API 2H-50 steel sheet, whose chemical composition and mass percentage are as follows: C: 0.16%, Si: 0.29%, Mn: 1.58%, P: 0.011%, S: 0.002%, Nb: 0.036 %, Ti: 0.015%, Al: 0.026%, and the balance is iron and inevitable impurity elements.
  • the manufacturing method thereof specifically includes the following steps:
  • Hot metal pretreatment S ⁇ 0.010%; after BOF smelting furnace, deoxidation alloying is more than 90%; LF refining outside the furnace for 25 minutes, fine-tuning the alloy composition and molten steel temperature; RH vacuum degassing for 25 minutes, RH bottom blowing argon with reasonable stirring and Float to remove non-metallic inclusions and reduce the content of nitrogen, hydrogen and oxygen; feed calcium wire to purify molten steel to spheroidize non-metallic inclusions; pour under argon protection throughout the process, pulling speed 0.95m/min, electromagnetic stirring;
  • the slab is then uniformly heated to 1180°C for 4.5 hours;
  • the mechanical properties of the steel plate were obtained: the yield strength was 380MPa, the tensile strength was 520MPa, and the elongation was 26%.
  • -40°C, 5% deformation aging impact toughness is 136J, 131J, 143J (10*10mm).
  • This embodiment provides a 50mm specification API 2H-50 steel sheet, whose chemical composition and mass percentage are as follows: C: 0.17%, Si: 0.26%, Mn: 1.55%, P: 0.012%, S: 0.002%, Nb: 0.026 %, Ti: 0.017%, Al: 0.032%, and the balance is iron and inevitable impurity elements.
  • the manufacturing method thereof specifically includes the following steps:
  • Hot metal pretreatment S ⁇ 0.010%; after BOF smelting furnace, deoxidation alloying is more than 90%; LF refining outside the furnace for 25 minutes, fine-tuning the alloy composition and molten steel temperature; RH vacuum degassing for 25 minutes, RH bottom blowing argon with reasonable stirring and Float to remove non-metallic inclusions and reduce the content of nitrogen, hydrogen and oxygen; feed calcium wire to purify molten steel, spheroidize non-metallic inclusions; pour under argon protection throughout the process, pulling speed 0.95m/min, electromagnetic stirring;
  • the slab is then uniformly heated to 1170°C, and the heating time is 4.4 hours;
  • the mechanical properties of the steel plate were obtained: the yield strength was 400 MPa, the tensile strength was 510 MPa, and the elongation was 22%.
  • -40°C, 5% deformation aging impact toughness is 155J, 149J, 151J (10*10mm).
  • This embodiment provides a 20mm specification API 2H-50 steel sheet, whose chemical composition and mass percentage are as follows: C: 0.16%, Si: 0.29%, Mn: 1.56%, P: 0.011%, S: 0.001%, Nb: 0.027 %, Ti: 0.019%, Al: 0.025%, and the balance is iron and inevitable impurity elements.
  • the manufacturing method thereof specifically includes the following steps:
  • Hot metal pretreatment S ⁇ 0.010%; after BOF smelting furnace, deoxidation alloying is more than 90%; LF refining outside the furnace for 26 minutes, fine-tuning the alloy composition and molten steel temperature; RH vacuum degassing for 25 minutes, RH bottom blowing argon with reasonable stirring and Float to remove non-metallic inclusions and reduce the content of nitrogen, hydrogen and oxygen; feed calcium wire to purify molten steel and spheroidize non-metallic inclusions; pour under argon protection throughout the process, pulling speed 0.90m/min, electromagnetic stirring;
  • the slab is then uniformly heated to 1190°C for 4.5 hours;
  • the mechanical properties of the steel plate were obtained: the yield strength was 415MPa, the tensile strength was 535MPa, and the elongation was 25%.
  • -40°C, 5% deformation aging impact toughness is 113J, 122J, 123J (10*10mm).
  • This embodiment provides a 6mm specification API 2H-50 steel sheet, whose chemical composition and mass percentage are as follows: C: 0.13%, Si: 0.23%, Mn: 1.53%, P: 0.013%, S: 0.001%, Nb: 0.019 %, Al: 0.030%, the balance is iron and inevitable impurity elements.
  • the manufacturing method thereof specifically includes the following steps:
  • Hot metal pretreatment S ⁇ 0.010%; after BOF smelting furnace, deoxidation alloying is more than 90%; LF refining outside the furnace for 25 minutes, fine-tuning the alloy composition and molten steel temperature; RH vacuum degassing for 25 minutes, RH bottom blowing argon with reasonable stirring and Float to remove non-metallic inclusions and reduce the content of nitrogen, hydrogen and oxygen; feed calcium wire to purify molten steel to spheroidize non-metallic inclusions; pour under argon protection throughout the process, pulling speed 0.95m/min, electromagnetic stirring;
  • the slab is then uniformly heated to 1190°C, and the heating time is 4.2 hours;
  • the mechanical properties of the steel plate were obtained: the yield strength was 375MPa, the tensile strength was 515MPa, and the elongation was 22%.
  • -40°C, 5% deformation aging impact toughness is 75J, 81J, 73J (5*10mm).
  • the present invention has developed a new material of high toughness, high aging impact toughness, low alloy steel for offshore oil and gas production offshore platforms and a manufacturing method thereof, which meets the needs of the international market, and has good low temperature toughness and Strain-aged impact toughness properties.
  • the annual production and sales volume 100,000 to 200,000 tons, and the gross profit per ton of steel is 360 yuan, the annual gross profit exceeds 36 million to 72 million yuan, which is conducive to promoting steel exports, developing the Middle East and other marine structural steel markets, winning international reputation, and having huge potential social benefits. .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

La présente divulgation concerne une plaque d'acier d'impact à haute ténacité et à haute résistance au vieillissement et son procédé de fabrication, et la présente invention concerne le domaine technique de la production d'acier. La plaque d'acier d'impact à haute ténacité et à haute résistance au vieillissement comprend les constituants chimiques suivants, en pourcentages en masse : 0,12 à 0,22 % de C, 0,10 à 0,60 % de Si, 1,15 à 1,60 % de Mn, moins de 0,020 % de P, moins de 0,015 % de S, le ou les éléments d'alliage suivants étant ajoutés : 0 à 0,060 % de Nb, 0 à 0,12 % de Ti et 0,010 à 0,050 % d'Al, le reste étant du fer et des impuretés inévitables. La plaque d'acier peut supporter et résister à une contrainte marine complexe à une température basse de -40 °C, sa limite d'élasticité la plus faible est de 345 MPa, celle-ci présente une bonne ténacité à une température basse de -40 °C, une excellente performance au vieillissement, et présente également une bonne performance de soudage et un faible équivalent carbone.
PCT/CN2021/096176 2021-01-04 2021-05-26 Plaque d'acier d'impact à haute ténacité et à haute résistance au vieillissement et son procédé de fabrication WO2022142101A1 (fr)

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Application Number Priority Date Filing Date Title
CN202110000999.XA CN112680672A (zh) 2021-01-04 2021-01-04 一种高韧性高时效冲击钢板及其制造方法
CN202110000999.X 2021-01-04

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112680672A (zh) * 2021-01-04 2021-04-20 南京钢铁股份有限公司 一种高韧性高时效冲击钢板及其制造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101418417A (zh) * 2008-12-04 2009-04-29 南京钢铁股份有限公司 宽厚规格高强度船板钢及其生产工艺
KR20110130974A (ko) * 2010-05-28 2011-12-06 현대제철 주식회사 변형시효 충격 특성이 우수한 인장강도 400㎫급 후판 제조방법
CN109321838A (zh) * 2018-08-30 2019-02-12 南京钢铁股份有限公司 高硅含量440MPa级低温韧性结构钢板及制造方法
CN110699599A (zh) * 2019-09-25 2020-01-17 南京钢铁股份有限公司 一种超低温用q345r钢及其制造方法
CN110846585A (zh) * 2019-10-28 2020-02-28 南京钢铁股份有限公司 一种铁路转向架用q345c钢板及其制造方法
CN111560561A (zh) * 2020-04-17 2020-08-21 南京钢铁股份有限公司 一种355MPa级低合金高疲劳钢及其制造方法
CN112680672A (zh) * 2021-01-04 2021-04-20 南京钢铁股份有限公司 一种高韧性高时效冲击钢板及其制造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111534740A (zh) * 2020-04-17 2020-08-14 南京钢铁股份有限公司 一种550MPa抗疲劳高强高韧钢板及其制造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101418417A (zh) * 2008-12-04 2009-04-29 南京钢铁股份有限公司 宽厚规格高强度船板钢及其生产工艺
KR20110130974A (ko) * 2010-05-28 2011-12-06 현대제철 주식회사 변형시효 충격 특성이 우수한 인장강도 400㎫급 후판 제조방법
CN109321838A (zh) * 2018-08-30 2019-02-12 南京钢铁股份有限公司 高硅含量440MPa级低温韧性结构钢板及制造方法
CN110699599A (zh) * 2019-09-25 2020-01-17 南京钢铁股份有限公司 一种超低温用q345r钢及其制造方法
CN110846585A (zh) * 2019-10-28 2020-02-28 南京钢铁股份有限公司 一种铁路转向架用q345c钢板及其制造方法
CN111560561A (zh) * 2020-04-17 2020-08-21 南京钢铁股份有限公司 一种355MPa级低合金高疲劳钢及其制造方法
CN112680672A (zh) * 2021-01-04 2021-04-20 南京钢铁股份有限公司 一种高韧性高时效冲击钢板及其制造方法

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