EP4407058A4 - HIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH EXCELLENT SURFACE QUALITY AND LOW DEVIATION IN MECHANICAL PROPERTIES AND MANUFACTURING PROCESSES FOR IT - Google Patents

HIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH EXCELLENT SURFACE QUALITY AND LOW DEVIATION IN MECHANICAL PROPERTIES AND MANUFACTURING PROCESSES FOR IT

Info

Publication number
EP4407058A4
EP4407058A4 EP22873153.5A EP22873153A EP4407058A4 EP 4407058 A4 EP4407058 A4 EP 4407058A4 EP 22873153 A EP22873153 A EP 22873153A EP 4407058 A4 EP4407058 A4 EP 4407058A4
Authority
EP
European Patent Office
Prior art keywords
steel sheet
mechanical properties
rolled steel
manufacturing processes
surface quality
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
EP22873153.5A
Other languages
German (de)
French (fr)
Other versions
EP4407058A1 (en
Inventor
Joo-Hyun Ryu
Sung-Il Kim
Chang-Hyo Seo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
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 Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP4407058A1 publication Critical patent/EP4407058A1/en
Publication of EP4407058A4 publication Critical patent/EP4407058A4/en
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
    • C22C38/02—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
    • 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
    • C21D6/005—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 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
    • 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
    • C22C38/001—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
    • C22C38/04—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
    • C22C38/18—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
    • C22C38/32—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
    • 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
    • C21D2211/005—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)
EP22873153.5A 2021-09-24 2022-09-20 HIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH EXCELLENT SURFACE QUALITY AND LOW DEVIATION IN MECHANICAL PROPERTIES AND MANUFACTURING PROCESSES FOR IT Pending EP4407058A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020210126115A KR20230043352A (en) 2021-09-24 2021-09-24 High strength cold rolled steel sheet having excellent surface quality and low mechanical property deviation and manufacturing method of the same
PCT/KR2022/014012 WO2023048448A1 (en) 2021-09-24 2022-09-20 High strength cold rolled steel sheet having excellent surface quality and low mechanical property deviation and manufacturing method of same

Publications (2)

Publication Number Publication Date
EP4407058A1 EP4407058A1 (en) 2024-07-31
EP4407058A4 true EP4407058A4 (en) 2025-10-29

Family

ID=85720915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22873153.5A Pending EP4407058A4 (en) 2021-09-24 2022-09-20 HIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH EXCELLENT SURFACE QUALITY AND LOW DEVIATION IN MECHANICAL PROPERTIES AND MANUFACTURING PROCESSES FOR IT

Country Status (7)

Country Link
US (1) US20240247349A1 (en)
EP (1) EP4407058A4 (en)
JP (2) JP2024535899A (en)
KR (1) KR20230043352A (en)
CN (1) CN118019871A (en)
MX (1) MX2024003556A (en)
WO (1) WO2023048448A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20250093772A (en) * 2023-12-15 2025-06-25 주식회사 포스코 Cold rolled steel sheet and mehtod of manufacturing the same
JP2026069383A (en) * 2024-10-11 2026-04-23 東洋鋼鈑株式会社 Batch annealing method for steel sheet coils and cold-rolled steel sheet
WO2026135270A1 (en) * 2024-12-17 2026-06-25 주식회사 포스코 Cold-rolled steel sheet and manufacturing method therefor

Citations (5)

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EP2799568A1 (en) * 2011-12-26 2014-11-05 JFE Steel Corporation High-strength steel sheet and method for manufacturing same
JP2015175061A (en) * 2014-03-18 2015-10-05 新日鐵住金株式会社 A high-strength steel sheet having a maximum tensile strength of 780 MPa, a high-strength steel sheet excellent in impact characteristics, a high-strength hot-dip galvanized steel sheet, a high-strength galvannealed steel sheet, and a method for producing them.
WO2016194272A1 (en) * 2015-05-29 2016-12-08 Ｊｆｅスチール株式会社 High-strength cold-rolled steel sheet, high-strength plated steel sheet, and method for producing same
JP2020019992A (en) * 2018-07-31 2020-02-06 Ｊｆｅスチール株式会社 Thin steel sheet and method for producing the same
KR20210080664A (en) * 2019-12-20 2021-07-01 주식회사 포스코 Steel sheet having excellent ductility and workablity, and method for manufacturing thereof

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JPH06315702A (en) * 1993-05-07 1994-11-15 Nippon Steel Corp Manufacture of thin steel sheet excellent in surface property and manufacturing equipment line therefor
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JP5359168B2 (en) 2008-10-08 2013-12-04 Ｊｆｅスチール株式会社 Ultra-high strength cold-rolled steel sheet with excellent ductility and method for producing the same
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JP4737319B2 (en) * 2009-06-17 2011-07-27 Ｊｆｅスチール株式会社 High-strength galvannealed steel sheet with excellent workability and fatigue resistance and method for producing the same
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US11091818B2 (en) * 2015-12-23 2021-08-17 Posco High strength cold-rolled steel sheet and hot-dip galvanized steel sheet having excellent hole expansion, ductility and surface treatment properties, and method for manufacturing same
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Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2799568A1 (en) * 2011-12-26 2014-11-05 JFE Steel Corporation High-strength steel sheet and method for manufacturing same
JP2015175061A (en) * 2014-03-18 2015-10-05 新日鐵住金株式会社 A high-strength steel sheet having a maximum tensile strength of 780 MPa, a high-strength steel sheet excellent in impact characteristics, a high-strength hot-dip galvanized steel sheet, a high-strength galvannealed steel sheet, and a method for producing them.
WO2016194272A1 (en) * 2015-05-29 2016-12-08 Ｊｆｅスチール株式会社 High-strength cold-rolled steel sheet, high-strength plated steel sheet, and method for producing same
JP2020019992A (en) * 2018-07-31 2020-02-06 Ｊｆｅスチール株式会社 Thin steel sheet and method for producing the same
KR20210080664A (en) * 2019-12-20 2021-07-01 주식회사 포스코 Steel sheet having excellent ductility and workablity, and method for manufacturing thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2023048448A1 *

Also Published As

Publication number Publication date
JP2026108814A (en) 2026-06-30
JP2024535899A (en) 2024-10-02
EP4407058A1 (en) 2024-07-31
KR20230043352A (en) 2023-03-31
WO2023048448A1 (en) 2023-03-30
CN118019871A (en) 2024-05-10
US20240247349A1 (en) 2024-07-25
MX2024003556A (en) 2024-06-19

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A4 Supplementary search report drawn up and despatched

Effective date: 20251001

RIC1 Information provided on ipc code assigned before grant

Ipc: C22C 38/04 20060101AFI20250925BHEP

Ipc: C22C 38/02 20060101ALI20250925BHEP

Ipc: C22C 38/06 20060101ALI20250925BHEP

Ipc: C22C 38/00 20060101ALI20250925BHEP

Ipc: C22C 38/38 20060101ALI20250925BHEP

Ipc: C22C 38/22 20060101ALI20250925BHEP

Ipc: C22C 38/32 20060101ALI20250925BHEP

Ipc: C22C 38/12 20060101ALI20250925BHEP

Ipc: C21D 9/46 20060101ALI20250925BHEP

Ipc: C21D 8/02 20060101ALI20250925BHEP

Ipc: C21D 6/00 20060101ALI20250925BHEP

Ipc: C21D 1/18 20060101ALI20250925BHEP