KR20240019756A - 우수한 전체 성형성 및 굽힘 특성을 갖는 자동차용 고강도 냉간 압연 강판 - Google Patents

우수한 전체 성형성 및 굽힘 특성을 갖는 자동차용 고강도 냉간 압연 강판 Download PDF

Info

Publication number
KR20240019756A
KR20240019756A KR1020237036779A KR20237036779A KR20240019756A KR 20240019756 A KR20240019756 A KR 20240019756A KR 1020237036779 A KR1020237036779 A KR 1020237036779A KR 20237036779 A KR20237036779 A KR 20237036779A KR 20240019756 A KR20240019756 A KR 20240019756A
Authority
KR
South Korea
Prior art keywords
strength
steel sheet
rolled steel
cold rolled
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
KR1020237036779A
Other languages
English (en)
Korean (ko)
Inventor
미하엘 슈바르첸브루너
에디프 오체르 아르만
토마스 헤베스베르거
Original Assignee
뵈스트알파인 스탈 게엠베하
도요타 모터 유럽
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 뵈스트알파인 스탈 게엠베하, 도요타 모터 유럽 filed Critical 뵈스트알파인 스탈 게엠베하
Publication of KR20240019756A publication Critical patent/KR20240019756A/ko
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys 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 of ferrous metals or ferrous alloys 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
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0447—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the heat treatment
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
    • C22C38/46—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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C21D2211/001—Austenite
    • 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
    • C21D2211/005—Ferrite
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
KR1020237036779A 2021-04-07 2022-04-05 우수한 전체 성형성 및 굽힘 특성을 갖는 자동차용 고강도 냉간 압연 강판 Pending KR20240019756A (ko)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE2150431A SE544819C2 (en) 2021-04-07 2021-04-07 High strength cold rolled steel sheet for automotive use having excellent global formability and bending property
SE21504311 2021-04-07
PCT/EP2022/059016 WO2022214488A1 (en) 2021-04-07 2022-04-05 High strength cold rolled steel sheet for automotive use having excellent global formability and bending property

Publications (1)

Publication Number Publication Date
KR20240019756A true KR20240019756A (ko) 2024-02-14

Family

ID=81308219

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020237036779A Pending KR20240019756A (ko) 2021-04-07 2022-04-05 우수한 전체 성형성 및 굽힘 특성을 갖는 자동차용 고강도 냉간 압연 강판

Country Status (7)

Country Link
US (1) US20240167137A1 (https=)
EP (1) EP4320281A1 (https=)
JP (1) JP2024513104A (https=)
KR (1) KR20240019756A (https=)
CN (1) CN117480271A (https=)
SE (1) SE544819C2 (https=)
WO (1) WO2022214488A1 (https=)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119061242A (zh) * 2024-09-05 2024-12-03 首钢集团有限公司 一种高弯曲性能1300MPa级冷轧马氏体钢及其制备方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03277743A (ja) * 1990-03-27 1991-12-09 Kawasaki Steel Corp 超高張力冷延鋼板およびその製造法
JP2010126808A (ja) * 2008-12-01 2010-06-10 Sumitomo Metal Ind Ltd 冷延鋼板およびその製造方法
JP2010229514A (ja) * 2009-03-27 2010-10-14 Sumitomo Metal Ind Ltd 冷延鋼板およびその製造方法
KR20130027793A (ko) * 2011-09-08 2013-03-18 현대하이스코 주식회사 연성이 우수한 인장강도 1180ＭＰａ급 초고강도 냉연강판, 용융도금강판 및 그 제조 방법
JP6232045B2 (ja) * 2012-03-30 2017-11-15 フォエスタルピネ スタール ゲゼルシャフト ミット ベシュレンクテル ハフツングＶｏｅｓｔａｌｐｉｎｅ Ｓｔａｈｌ Ｇｍｂｈ 高強度冷間圧延鋼板およびそのような鋼板を作製する方法
CN104245971B (zh) * 2012-03-30 2017-09-12 奥钢联钢铁有限责任公司 高强度冷轧钢板和生产该钢板的方法
US10202664B2 (en) * 2012-03-30 2019-02-12 Voestalpine Stahl Gmbh High strength cold rolled steel sheet
KR20160001485A (ko) * 2014-06-27 2016-01-06 현대제철 주식회사 냉연강판 및 그 제조 방법
KR101786318B1 (ko) * 2016-03-28 2017-10-18 주식회사 포스코 항복강도와 연성이 우수한 고강도 냉연강판, 도금강판 및 이들의 제조방법
WO2018009090A1 (ru) 2016-07-07 2018-01-11 Артем Ромаевич ОГАНОВ Компьютерно реализуемый способ поиска кристаллических структур
US11186889B2 (en) * 2016-08-10 2021-11-30 Jfe Steel Corporation High-strength steel sheet and manufacturing method therefor
SE1651545A1 (en) * 2016-11-25 2018-03-06 High strength cold rolled steel sheet for automotive use
SE1950072A1 (en) * 2019-01-22 2020-07-21 Voestalpine Stahl Gmbh Cold rolled steel sheet
JP2022520485A (ja) * 2019-02-18 2022-03-30 タタ、スティール、アイモイデン、ベスローテン、フェンノートシャップ 機械的特性が改善された高強度鋼
EP3754035B2 (en) * 2019-06-17 2025-04-30 Tata Steel IJmuiden B.V. Method of heat treating a cold rolled steel strip
EP3754034B1 (en) * 2019-06-17 2022-03-02 Tata Steel IJmuiden B.V. Heat treatment of cold rolled steel strip

Also Published As

Publication number Publication date
WO2022214488A1 (en) 2022-10-13
CN117480271A (zh) 2024-01-30
SE2150431A1 (en) 2022-10-08
US20240167137A1 (en) 2024-05-23
SE544819C2 (en) 2022-12-06
EP4320281A1 (en) 2024-02-14
JP2024513104A (ja) 2024-03-21

Similar Documents

Publication Publication Date Title
EP2157203B1 (en) High-strength steel sheet superior in formability
US20190040483A1 (en) High-strength steel sheet and method for producing the same
EP3653736A1 (en) Hot-rolled steel strip and manufacturing method
US20110139315A1 (en) High strength galvanized steel sheet with excellent formability and method for manufacturing the same
JP4362318B2 (ja) 耐遅れ破壊特性に優れた高強度鋼板及びその製造方法
CN101326300B (zh) 热镀锌钢板及其制造方法
EP1870483B1 (en) Hot-rolled steel sheet, method for production thereof and workedd article formed therefrom
KR20080038202A (ko) 연성이 우수한 고강도 강 시트의 제조 방법 및 그 제조방법에 의해 제조된 시트
US20240327961A1 (en) High strength cold rolled steel strip sheet for automotive use having good withstandability to retained austentite decomposition
CN113316649A (zh) 高强度高延展性的复相的冷轧钢带或板
US20190352750A1 (en) High strength cold rolled steel sheet for automotive use
CN113348255A (zh) 冷轧钢板
JP3247908B2 (ja) 延性と耐遅れ破壊特性に優れた高強度熱延鋼板およびその製造方法
JP6037087B1 (ja) 高強度冷延鋼板およびその製造方法
CN116829756B (zh) 卷取温度影响的冷轧带或钢
US20240229183A9 (en) Coiling temperature influenced cold rolled strip or steel
KR20250004889A (ko) 냉간 압연된 마르텐사이트 강 및 그 마르텐사이트 강의 방법
US20240167137A1 (en) High strength cold rolled steel sheet for automotive use having excellent global formability and bending property
EP3686293B1 (en) A high strength high ductility complex phase cold rolled steel strip or sheet
KR20230129244A (ko) 개선된 아연 접착력을 갖는 아연 또는 아연-합금 코팅된스트립 또는 강
SE542818C2 (en) A high strength high ductility complex phase cold rolled steel strip or sheet
EP4628614A1 (en) Ultra-high strength steel sheet having excellent hole expansion ratio, and method for manufacturing same
CN120548381A (zh) 冷轧钢及其生产方法
KR20250093772A (ko) 냉연강판 및 그 제조방법
KR20250097829A (ko) 고강도 다상 강으로부터 강 스트립을 제조하는 방법 및 대응하는 강 스트립

Legal Events

Date Code Title Description
PA0105 International application

Patent event date: 20231025

Patent event code: PA01051R01D

Comment text: International Patent Application

PG1501 Laying open of application
A201 Request for examination
PA0201 Request for examination

Patent event code: PA02012R01D

Patent event date: 20250326

Comment text: Request for Examination of Application