EP2327810A4 - High-strength steel sheet and method for production thereof - Google Patents

High-strength steel sheet and method for production thereof

Info

Publication number
EP2327810A4
EP2327810A4 EP09813166.7A EP09813166A EP2327810A4 EP 2327810 A4 EP2327810 A4 EP 2327810A4 EP 09813166 A EP09813166 A EP 09813166A EP 2327810 A4 EP2327810 A4 EP 2327810A4
Authority
EP
European Patent Office
Prior art keywords
less
steel sheet
whole
area percentage
martensite
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.)
Granted
Application number
EP09813166.7A
Other languages
German (de)
French (fr)
Other versions
EP2327810B1 (en
EP2327810A1 (en
Inventor
Hiroshi Matsuda
Yoshimasa Funakawa
Yasushi Tanaka
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.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=42005270&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2327810(A4) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP2327810A1 publication Critical patent/EP2327810A1/en
Publication of EP2327810A4 publication Critical patent/EP2327810A4/en
Application granted granted Critical
Publication of EP2327810B1 publication Critical patent/EP2327810B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • 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
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • 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
    • C21D2211/002—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

Landscapes

  • 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)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)

Abstract

A high strength steel sheet having excellent workability and a tensile strength (TS) of 980 MPa or more is provided. Regarding composition, on a percent by mass basis, C: 0.17% or more, and 0.73% or less, Si: 3.0% or less, Mn: 0.5% or more, and 3.0% or less, P: 0.1% or less, S: 0.07% or less, Al: 3.0% or less, and N: 0.010% or less are included while it is satisfied that Si + Al is 0.7% or more, and the remainder includes Fe and incidental impurities, wherein regarding the steel sheet microstructure, it is specified that the area percentage of a total amount of lower bainite and whole martensite is 10% or more, and 90% or less relative to the whole steel sheet microstructure, the amount of retained austenite is 5% or more, and 50% or less, the area percentage of bainitic ferrite in upper bainite is 5% or more relative to the whole steel sheet microstructure, as-quenched martensite is 75% or less of the total amount of lower bainite and whole martensite, the area percentage of polygonal ferrite is 10% or less (including 0%), and the average amount of C in the above-described retained austenite is 0.70% or more.
EP09813166.7A 2008-09-10 2009-09-08 High-strength steel sheet and method for production thereof Active EP2327810B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008232437A JP5365112B2 (en) 2008-09-10 2008-09-10 High strength steel plate and manufacturing method thereof
PCT/JP2009/065981 WO2010030021A1 (en) 2008-09-10 2009-09-08 High-strength steel sheet and method for production thereof

Publications (3)

Publication Number Publication Date
EP2327810A1 EP2327810A1 (en) 2011-06-01
EP2327810A4 true EP2327810A4 (en) 2013-11-20
EP2327810B1 EP2327810B1 (en) 2019-02-27

Family

ID=42005270

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09813166.7A Active EP2327810B1 (en) 2008-09-10 2009-09-08 High-strength steel sheet and method for production thereof

Country Status (8)

Country Link
US (1) US20110162762A1 (en)
EP (1) EP2327810B1 (en)
JP (1) JP5365112B2 (en)
KR (1) KR101341731B1 (en)
CN (1) CN102149841B (en)
CA (1) CA2734978C (en)
TW (1) TWI412609B (en)
WO (1) WO2010030021A1 (en)

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JP5883211B2 (en) * 2010-01-29 2016-03-09 株式会社神戸製鋼所 High-strength cold-rolled steel sheet with excellent workability and method for producing the same
JP5333298B2 (en) * 2010-03-09 2013-11-06 Ｊｆｅスチール株式会社 Manufacturing method of high-strength steel sheet
JP5671359B2 (en) * 2010-03-24 2015-02-18 株式会社神戸製鋼所 High strength steel plate with excellent warm workability
JP5825481B2 (en) * 2010-11-05 2015-12-02 Ｊｆｅスチール株式会社 High-strength cold-rolled steel sheet excellent in deep drawability and bake hardenability and its manufacturing method
JP5662902B2 (en) * 2010-11-18 2015-02-04 株式会社神戸製鋼所 High-strength steel sheet with excellent formability, warm working method, and warm-worked automotive parts
JP5662903B2 (en) * 2010-11-18 2015-02-04 株式会社神戸製鋼所 High-strength steel sheet with excellent formability, warm working method, and warm-worked automotive parts
JP5906753B2 (en) * 2011-02-24 2016-04-20 Ｊｆｅスチール株式会社 Alloy hot-dip galvanized steel sheet
CN103459638B (en) 2011-03-31 2015-07-15 株式会社神户制钢所 High-strength steel sheet with excellent workability and manufacturing process therefor
US9745639B2 (en) 2011-06-13 2017-08-29 Kobe Steel, Ltd. High-strength steel sheet excellent in workability and cold brittleness resistance, and manufacturing method thereof
JP5824283B2 (en) * 2011-08-17 2015-11-25 株式会社神戸製鋼所 High strength steel plate with excellent formability at room temperature and warm temperature
JP6047983B2 (en) * 2011-08-19 2016-12-21 Ｊｆｅスチール株式会社 Method for producing high-strength cold-rolled steel sheet excellent in elongation and stretch flangeability
TWI507535B (en) * 2011-09-30 2015-11-11 Nippon Steel & Sumitomo Metal Corp Alloyed molten galvanized steel sheet
MX356543B (en) 2011-09-30 2018-06-01 Nippon Steel & Sumitomo Metal Corp High-strength hot-dip galvanized steel sheet.
CN103857819B (en) * 2011-10-04 2016-01-13 杰富意钢铁株式会社 High tensile steel plate and manufacture method thereof
JP5860308B2 (en) * 2012-02-29 2016-02-16 株式会社神戸製鋼所 High strength steel plate with excellent warm formability and method for producing the same
JP5348268B2 (en) 2012-03-07 2013-11-20 Ｊｆｅスチール株式会社 High-strength cold-rolled steel sheet having excellent formability and method for producing the same
JP6228741B2 (en) * 2012-03-27 2017-11-08 株式会社神戸製鋼所 High-strength hot-dip galvanized steel sheet, high-strength alloyed hot-dip galvanized steel sheet, which has a small difference in strength between the central part and the end part in the sheet width direction and has excellent bending workability, and methods for producing these
JP5764549B2 (en) 2012-03-29 2015-08-19 株式会社神戸製鋼所 High-strength cold-rolled steel sheet, high-strength hot-dip galvanized steel sheet, high-strength galvannealed steel sheet excellent in formability and shape freezing property, and methods for producing them
EP2831296B2 (en) 2012-03-30 2020-04-15 Voestalpine Stahl GmbH High strength cold rolled steel sheet and method of producing such steel sheet
JP5966598B2 (en) * 2012-05-17 2016-08-10 Ｊｆｅスチール株式会社 High yield ratio high strength cold-rolled steel sheet excellent in workability and method for producing the same
KR101412262B1 (en) * 2012-06-19 2014-06-27 현대제철 주식회사 High strength cold-rolled steel sheet for automobile with excellent bendability and formability and method of manufacturing the same
EP2690184B1 (en) * 2012-07-27 2020-09-02 ThyssenKrupp Steel Europe AG Produit plat en acier laminé à froid et son procédé de fabrication
EP2690183B1 (en) * 2012-07-27 2017-06-28 ThyssenKrupp Steel Europe AG Hot-rolled steel flat product and method for its production
BR112015002312A2 (en) 2012-08-06 2017-07-04 Nippon Steel & Sumitomo Metal Corp cold-rolled steel plate and method for producing it, and hot-formed element
CN102904297A (en) * 2012-09-11 2013-01-30 苏州市莱赛电车技术有限公司 Device for charging electromobile at top
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JP6282577B2 (en) * 2014-11-26 2018-02-21 株式会社神戸製鋼所 High strength high ductility steel sheet
KR101695263B1 (en) * 2014-12-30 2017-01-12 한국기계연구원 High strength steel sheet with excellent productivity, combination of strength and ductility, method of manufacturing the same
CN107109507B (en) * 2014-12-30 2019-03-01 韩国机械硏究院 The combination of intensity and ductility outstanding high-strength steel sheet and its manufacturing method
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US11136656B2 (en) * 2015-05-21 2021-10-05 Cleveland-Cliffs Steel Properties Inc. High manganese 3rd generation advanced high strength steels
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KR20220129615A (en) * 2020-02-28 2022-09-23 제이에프이 스틸 가부시키가이샤 Steel plate, member and manufacturing method thereof
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Also Published As

Publication number Publication date
TW201020329A (en) 2010-06-01
CA2734978C (en) 2016-03-29
JP5365112B2 (en) 2013-12-11
KR20110042369A (en) 2011-04-26
CA2734978A1 (en) 2010-03-18
CN102149841B (en) 2013-11-20
EP2327810B1 (en) 2019-02-27
JP2010065273A (en) 2010-03-25
US20110162762A1 (en) 2011-07-07
EP2327810A1 (en) 2011-06-01
CN102149841A (en) 2011-08-10
KR101341731B1 (en) 2013-12-16
TWI412609B (en) 2013-10-21
WO2010030021A1 (en) 2010-03-18

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