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EP2327810A1 - Feuille d'acier de résistance élevée et son procédé de fabrication - Google Patents

Feuille d'acier de résistance élevée et son procédé de fabrication Download PDF

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Publication number
EP2327810A1
EP2327810A1 EP09813166A EP09813166A EP2327810A1 EP 2327810 A1 EP2327810 A1 EP 2327810A1 EP 09813166 A EP09813166 A EP 09813166A EP 09813166 A EP09813166 A EP 09813166A EP 2327810 A1 EP2327810 A1 EP 2327810A1
Authority
EP
European Patent Office
Prior art keywords
less
steel sheet
amount
high strength
microstructure
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
EP09813166A
Other languages
German (de)
English (en)
Other versions
EP2327810B1 (fr
EP2327810A4 (fr
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
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Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP2327810A1 publication Critical patent/EP2327810A1/fr
Publication of EP2327810A4 publication Critical patent/EP2327810A4/fr
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Publication of EP2327810B1 publication Critical patent/EP2327810B1/fr
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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
    • 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
    • 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
    • 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

Definitions

  • the high strength steel sheet according to the above-described item 1 or item 2 characterized in that the above-described steel sheet further contains at least one type of element selected from, on a percent by mass basis, Ti: 0.01% or more, and 0.1% or less and Nb: 0.01% or more, and 0.1% or less.
  • the present invention will be specifically described below. Initially, the reason for limitation of the steel sheet microstructure in such a way that described above in the present invention will be described.
  • the area percentage refers to an area percentage relative to the whole steel sheet microstructure.
  • the tensile strength becomes 980 MPa or more, but the stretch-flangeability is poor.
  • the as-quenched martensite is very hard, and the deformability of the as-quenched martensite in itself is very low. Therefore, the workability, especially stretch-flangeability, of the steel sheet deteriorates significantly. Furthermore, since the difference in hardness between the as-quenched martensite and the upper bainite is significantly large, if the amount of as-quenched martensite is large, the interface between the as-quenched martensite and the upper bainite increases.
  • Average amount of C in retained austenite 0.70% or more
  • the element Al is an element useful for strengthening steel and, in addition, is a useful element, which is added as a deoxidizing agent in a steel making process. If the amount of Al exceeds 3.0%, inclusion in a steel sheet increases and the elongation deteriorates. Therefore, the amount of Al is specified to be 3.0% or less. The amount is preferably 2.0% or less. Moreover, Al is an element useful for suppressing generation of carbides and facilitating generation of retained austenite. Furthermore, it is preferable that the amount of Al is specified to be 0.001% or more in order to obtain a deoxidation effect, and more preferably 0.005% or more. In this regard, the amount of Al in the present invention is the amount of Al contained in the steel sheet after deoxidation.
  • the elements Ca and REM are useful for spheroidizing the shape of sulfides and improve the adverse effect of sulfides on the stretch-flangeability. The effects thereof are obtained when individual contents are 0.001% or more. On the other hand, if the individual contents exceed 0.005%, increases of inclusion and the like are invited so as to cause surface defects, internal defects, and the like. Therefore, in the case where Ca and REM are contained, the ranges are specified to be Ca: 0.001% or more, and 0.005% or less and REM: 0.001% or more, and 0.005% or less.
  • the annealing temperature exceeds 1,000°C, growth of austenite grains is significant, coarser configuration phases are generated by downstream cooling, and the tenacity and the like deteriorate.
  • the annealing temperature is lower than A 3 point (austenite transformation point)
  • polygonal ferrite has already been generated in an annealing stage, and it becomes necessary that a temperature range of 500°C or more is cooled very rapidly in order to suppress growth of polygonal ferrite during cooling. Therefore, it is necessary that the annealing temperature is specified to be the A 3 point or higher, and preferably, 1,000°C or lower.
  • the method for manufacturing a high strength steel sheet according to the present invention can include that the high strength steel sheet is produced following the above-described manufacturing method according to the present invention, where steps up to the heat treatment have been completed, and thereafter, the galvanizing treatment or, furthermore, the galvannealing treatment is conducted. Alternatively, after the keeping in the second temperature range following the manufacturing method according to the present invention, the galvanizing treatment or the galvannealing treatment can be conducted succeedingly.
  • the steel sheet was ground-polished up to one-quarter of a sheet thickness in the sheet thickness direction and the amount of retained austenite was determined by X-ray diffractometry.
  • Co-K ⁇ was used and the amount of retained austenite were calculated from the average value of the intensity ratio of each of (200), (220), and (311) faces of austenite to the diffraction intensity of each of (200), (211), and (220) faces of ferrite.

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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)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)
EP09813166.7A 2008-09-10 2009-09-08 Feuille d'acier de résistance élevée et son procédé de fabrication Active EP2327810B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008232437A JP5365112B2 (ja) 2008-09-10 2008-09-10 高強度鋼板およびその製造方法
PCT/JP2009/065981 WO2010030021A1 (fr) 2008-09-10 2009-09-08 Feuille d'acier de résistance élevée et son procédé de fabrication

Publications (3)

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

Family

ID=42005270

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09813166.7A Active EP2327810B1 (fr) 2008-09-10 2009-09-08 Feuille d'acier de résistance élevée et son procédé de fabrication

Country Status (8)

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

Cited By (20)

* Cited by examiner, † Cited by third party
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GB2491958A (en) * 2011-06-13 2012-12-19 Kobe Steel Ltd Steel sheet with a tensile strength of at least 1180 MPa
EP2690184A1 (fr) * 2012-07-27 2014-01-29 ThyssenKrupp Steel Europe AG Cold rolled steel flat product and method for its production
EP2824210A4 (fr) * 2012-03-07 2015-04-29 Jfe Steel Corp Feuille d'acier laminée à froid à résistance élevée et son procédé de fabrication
US20150165727A1 (en) * 2012-01-23 2015-06-18 Jfe Steel Corporation Galvannealed steel sheet
EP2821517A4 (fr) * 2012-02-29 2015-11-04 Kobe Steel Ltd Feuille d'acier à haute résistance ayant une excellente aptitude au formage à chaud et son procédé de fabrication
WO2016001705A1 (fr) * 2014-07-03 2016-01-07 Arcelormittal Procédé de fabrication d'une tôle d'acier à haute résistance présentant une aptitude au formage et une ductilité améliorées, et tôle ainsi obtenue
WO2016187577A1 (fr) * 2015-05-21 2016-11-24 Ak Steel Properties, Inc. Aciers haute résistance améliorés de troisième génération à teneur élevée en manganèse
US10106874B2 (en) 2012-03-30 2018-10-23 Voestalpine Stahl Gmbh High strength cold rolled steel sheet
EP3309273A4 (fr) * 2015-06-11 2018-12-26 Nippon Steel & Sumitomo Metal Corporation Tôle d'acier recuite par galvanisation et procédé permettant de fabriquer cette dernière
US10260133B2 (en) 2013-03-28 2019-04-16 Jfe Steel Corporation High-strength steel sheet and method for producing the same
US10301700B2 (en) 2013-08-22 2019-05-28 Thyssenkrupp Steel Europe Ag Method for producing a steel component
WO2019154819A1 (fr) 2018-02-07 2019-08-15 Tata Steel Nederland Technology B.V. Acier haute résistance laminé à chaud ou laminé à froid et recuit et son procédé de production
WO2020151855A1 (fr) * 2019-01-22 2020-07-30 Voestalpine Stahl Gmbh Tôle d'acier laminée à froid
US10844455B2 (en) 2014-07-03 2020-11-24 Arcelormittal Method for manufacturing a high strength steel sheet and sheet obtained by the method
US11739392B2 (en) 2016-02-10 2023-08-29 Jfe Steel Corporation High-strength steel sheet and method for manufacturing the same
EP4283007A4 (fr) * 2021-03-02 2024-07-31 JFE Steel Corporation Tôle d'acier, élément, procédé de production de ladite tôle d'acier et procédé de production dudit élément
US12221668B2 (en) 2019-10-23 2025-02-11 Jfe Steel Corporation High strength steel sheet and method for manufacturing the same
US12258647B2 (en) 2020-02-28 2025-03-25 Jfe Steel Corporation Steel sheet, member, and methods for manufacturing the same
US12286680B2 (en) 2018-10-17 2025-04-29 Jfe Steel Corporation Thin steel sheet and method for manufacturing same
US12467105B2 (en) 2014-07-03 2025-11-11 Arcelormittal Method for manufacturing a high strength steel sheet having improved formability and sheet obtained

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JP6228741B2 (ja) * 2012-03-27 2017-11-08 株式会社神戸製鋼所 板幅方向における中央部と端部の強度差が少なく、曲げ加工性に優れた高強度溶融亜鉛めっき鋼板、高強度合金化溶融亜鉛めっき鋼板、およびこれらの製造方法
JP5764549B2 (ja) 2012-03-29 2015-08-19 株式会社神戸製鋼所 成形性および形状凍結性に優れた、高強度冷延鋼板、高強度溶融亜鉛めっき鋼板および高強度合金化溶融亜鉛めっき鋼板、ならびにそれらの製造方法
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ES2911661T3 (es) * 2019-06-17 2022-05-20 Tata Steel Ijmuiden Bv Tratamiento térmico de un fleje de acero laminado en frío de alta resistencia
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US12286680B2 (en) 2018-10-17 2025-04-29 Jfe Steel Corporation Thin steel sheet and method for manufacturing same
WO2020151855A1 (fr) * 2019-01-22 2020-07-30 Voestalpine Stahl Gmbh Tôle d'acier laminée à froid
US12319992B2 (en) 2019-01-22 2025-06-03 Voestalpine Stahl Gmbh Cold rolled steel sheet
US12221668B2 (en) 2019-10-23 2025-02-11 Jfe Steel Corporation High strength steel sheet and method for manufacturing the same
US12258647B2 (en) 2020-02-28 2025-03-25 Jfe Steel Corporation Steel sheet, member, and methods for manufacturing the same
EP4283007A4 (fr) * 2021-03-02 2024-07-31 JFE Steel Corporation Tôle d'acier, élément, procédé de production de ladite tôle d'acier et procédé de production dudit élément

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CN102149841B (zh) 2013-11-20
US20110162762A1 (en) 2011-07-07
JP5365112B2 (ja) 2013-12-11
EP2327810B1 (fr) 2019-02-27
JP2010065273A (ja) 2010-03-25
TW201020329A (en) 2010-06-01
EP2327810A4 (fr) 2013-11-20
WO2010030021A1 (fr) 2010-03-18
KR20110042369A (ko) 2011-04-26
KR101341731B1 (ko) 2013-12-16
CA2734978C (fr) 2016-03-29
CN102149841A (zh) 2011-08-10
CA2734978A1 (fr) 2010-03-18
TWI412609B (zh) 2013-10-21

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