WO2012067474A3 - 극저온 인성이 우수한 고강도 강재 및 그 제조방법 - Google Patents

극저온 인성이 우수한 고강도 강재 및 그 제조방법 Download PDF

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WO2012067474A3
WO2012067474A3 PCT/KR2011/008884 KR2011008884W WO2012067474A3 WO 2012067474 A3 WO2012067474 A3 WO 2012067474A3 KR 2011008884 W KR2011008884 W KR 2011008884W WO 2012067474 A3 WO2012067474 A3 WO 2012067474A3
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temperature
steel material
production method
low
cooling
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PCT/KR2011/008884
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French (fr)
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WO2012067474A2 (ko
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엄경근
최종교
장우길
노희군
조현관
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주식회사 포스코
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Priority to ES11841040.6T priority Critical patent/ES2581335T3/es
Priority to EP11841040.6A priority patent/EP2641987B1/en
Priority to JP2013539774A priority patent/JP5820889B2/ja
Priority to US13/824,647 priority patent/US9394579B2/en
Priority to CN201180055708.1A priority patent/CN103221562B/zh
Publication of WO2012067474A2 publication Critical patent/WO2012067474A2/ko
Publication of WO2012067474A3 publication Critical patent/WO2012067474A3/ko

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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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C21D2211/002—Bainite
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

본 발명은 LNG(Liquefied Natural Gas)등의 극저온용 저장용기의 구조재로 사용되는 망간 및 니켈 함유 강재 및 그 제조방법에 관한 것으로, 보다 상세하게는, 고가의 Ni 대신 저가의 Mn 등을 최적의 비율로 첨가하고 제어압연과 냉각을 통해 조직을 미세화시키고 템퍼링에 의해 잔류 오스테나이트를 석출시킴으로서 극저온 인성이 우수하고 동시에 고강도인 강재 및 그 제조방법을 제공하고자 하는 것이다. 상기 목적을 달성하기 위해 본 발명은 중량%로, 탄소(C):0.01~0.06%, 망간(Mn):2.0~8.0%, 니켈(Ni):0.01~6.0%, 몰리브덴(Mo):0.02~0.6%, 실리콘(Si):0.03~0.5%, 알루미늄(Al):0.003~0.05%, 질소(N):0.0015~0.01%, 인(P):0.02%이하, 황(S):0.01%이하, 나머지 Fe 및 기타 불순물을 포함하는 강슬라브를 1000~1250℃의 온도범위로 가열하는 가열단계, 상기 슬라브를 950℃ 이하의 온도에서 압연하는 압연단계, 상기 압연된 슬라브를 2℃/s 이상의 냉각속도로 400℃ 이하의 온도까지 냉각하는 냉각단계 및 상기 냉각단계 후 550~650℃ 온도구간에서 0.5~4시간 템퍼링하는 템퍼링단계를 포함하는 강재의 제조방법을 그 기술적 요지로 한다.
PCT/KR2011/008884 2010-11-19 2011-11-21 극저온 인성이 우수한 고강도 강재 및 그 제조방법 WO2012067474A2 (ko)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES11841040.6T ES2581335T3 (es) 2010-11-19 2011-11-21 Material de acero de alta resistencia que tiene una dureza sobresaliente a temperatura ultrabaja y método de producción del mismo
EP11841040.6A EP2641987B1 (en) 2010-11-19 2011-11-21 High-strength steel material having outstanding ultra-low-temperature toughness and a production method therefor
JP2013539774A JP5820889B2 (ja) 2010-11-19 2011-11-21 極低温靭性に優れた高強度鋼材及びその製造方法
US13/824,647 US9394579B2 (en) 2010-11-19 2011-11-21 High-strength steel material having outstanding ultra-low-temperature toughness and a production method therefor
CN201180055708.1A CN103221562B (zh) 2010-11-19 2011-11-21 具有优异的超低温韧性的高强度钢材料及其制备方法

Applications Claiming Priority (2)

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KR1020100115702A KR101271974B1 (ko) 2010-11-19 2010-11-19 극저온 인성이 우수한 고강도 강재 및 그 제조방법
KR10-2010-0115702 2010-11-19

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WO2012067474A2 WO2012067474A2 (ko) 2012-05-24
WO2012067474A3 true WO2012067474A3 (ko) 2012-09-13

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US (1) US9394579B2 (ko)
EP (1) EP2641987B1 (ko)
JP (1) JP5820889B2 (ko)
KR (1) KR101271974B1 (ko)
CN (1) CN103221562B (ko)
ES (1) ES2581335T3 (ko)
WO (1) WO2012067474A2 (ko)

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KR102075205B1 (ko) * 2017-11-17 2020-02-07 주식회사 포스코 극저온용 강재 및 그 제조방법
KR102020434B1 (ko) * 2017-12-01 2019-09-10 주식회사 포스코 수소 유기 균열 저항성 및 저온 충격인성이 우수한 고강도 강재 및 그 제조방법
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JP7306624B2 (ja) * 2019-06-19 2023-07-11 日本製鉄株式会社 鋼板
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KR102522570B1 (ko) * 2021-12-13 2023-04-26 현대제철 주식회사 용접 열영향부 극저온 인성이 우수한 후강판
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CN103221562B (zh) 2016-07-06
WO2012067474A2 (ko) 2012-05-24
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