WO2004059026A3 - Dual phase hot rolled steel sheets having excellent formability and stretch flangeability - Google Patents

Dual phase hot rolled steel sheets having excellent formability and stretch flangeability Download PDF

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Publication number
WO2004059026A3
WO2004059026A3 PCT/US2003/040252 US0340252W WO2004059026A3 WO 2004059026 A3 WO2004059026 A3 WO 2004059026A3 US 0340252 W US0340252 W US 0340252W WO 2004059026 A3 WO2004059026 A3 WO 2004059026A3
Authority
WO
WIPO (PCT)
Prior art keywords
mpa
hot rolled
temperature
steel sheets
dual phase
Prior art date
Application number
PCT/US2003/040252
Other languages
French (fr)
Other versions
WO2004059026A2 (en
Original Assignee
United States 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
Application filed by United States Steel Corp filed Critical United States Steel Corp
Publication of WO2004059026A2 publication Critical patent/WO2004059026A2/en
Publication of WO2004059026A3 publication Critical patent/WO2004059026A3/en

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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
    • 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
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • 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
    • 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
    • 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

Abstract

The present invention provides a process of producing a family of hot rolled dual phase steel sheets having excellent: formability and stretch flangeability, with yield strengths of from about 500 MPa to about 900 MPa from a single steel chemistry consisting of, by weight percent, 0.02-0.15 % of C, 0.3-2.5 % of Mn, 0.1-2.0 % of Cr, 0.01-0.2 % Al, 0.001-0.01 % Ca, not more than 0.1 % P, not more than 0.03 % S, not more than 0.2 % Ti, not more than 0.2 % V, not more than 0.2 % Nb, not more than 0.5 % Mo, not more than 0.5 % Cu, not more than 0.5 % Ni, the balance being Fe and unavoidable impurities. A slab or ingot of this composition is reheated to a temperature of between 1050°C and 1350°C and held at this temperature for at least 10 minutes, then hot rolled, completing the hot rolling at between 800°C and 1000°C. The sheet is cooled, immediately after completion of hot rolling, at a rate of not lower than 10°C/sec., without requiring specific cooling patterns, and coiled at a temperature of not less than 450°C. The cooling temperature is controlled to produce the desired yield strength within the range of from about 500 MPa to about 900 MPa.
PCT/US2003/040252 2002-12-18 2003-12-18 Dual phase hot rolled steel sheets having excellent formability and stretch flangeability WO2004059026A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/321,665 US20040118489A1 (en) 2002-12-18 2002-12-18 Dual phase hot rolled steel sheet having excellent formability and stretch flangeability
US10/321,665 2002-12-18

Publications (2)

Publication Number Publication Date
WO2004059026A2 WO2004059026A2 (en) 2004-07-15
WO2004059026A3 true WO2004059026A3 (en) 2005-01-20

Family

ID=32592949

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/040252 WO2004059026A2 (en) 2002-12-18 2003-12-18 Dual phase hot rolled steel sheets having excellent formability and stretch flangeability

Country Status (2)

Country Link
US (1) US20040118489A1 (en)
WO (1) WO2004059026A2 (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8337643B2 (en) 2004-11-24 2012-12-25 Nucor Corporation Hot rolled dual phase steel sheet
US7959747B2 (en) * 2004-11-24 2011-06-14 Nucor Corporation Method of making cold rolled dual phase steel sheet
US7442268B2 (en) * 2004-11-24 2008-10-28 Nucor Corporation Method of manufacturing cold rolled dual-phase steel sheet
US11155902B2 (en) 2006-09-27 2021-10-26 Nucor Corporation High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same
US7608155B2 (en) * 2006-09-27 2009-10-27 Nucor Corporation High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same
AU2008311043B2 (en) 2007-10-10 2013-02-21 Nucor Corporation Complex metallographic structured steel and method of manufacturing same
CN101418416B (en) * 2007-10-26 2010-12-01 宝山钢铁股份有限公司 Low welding crack sensitivity steel plate with yield strength of 800MPa grade and method for producing the same
CN101956141A (en) * 2010-10-08 2011-01-26 莱芜钢铁股份有限公司 Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof
CN103031493B (en) * 2011-09-29 2015-05-06 鞍钢股份有限公司 650MPa-level low-Si Cr-containing hot-rolled dual phase steel plate and manufacturing method thereof
JP5321672B2 (en) * 2011-11-08 2013-10-23 Ｊｆｅスチール株式会社 High-tensile hot-rolled steel sheet with excellent material uniformity and manufacturing method thereof
KR101638715B1 (en) * 2012-01-31 2016-07-11 제이에프이 스틸 가부시키가이샤 Hot-rolled steel for power generator rim and method for manufacturing same
UA117592C2 (en) 2013-08-01 2018-08-27 Арселорміттал PAINTED GALVANIZED STEEL SHEET AND METHOD OF MANUFACTURING
CN105925905B (en) * 2016-05-17 2018-07-06 武汉钢铁有限公司 780MPa grades of hot-rolled dual-phase steels of Nb-Ti systems and its production method
KR101925717B1 (en) * 2017-05-11 2018-12-05 포항공과대학교 산학협력단 Method of evaluating stretch-flangeability with small scale specimen without specimen size effects
CN108411206B (en) * 2018-04-11 2020-01-21 东北大学 Thin-specification hot-rolled dual-phase steel with tensile strength of 540MPa and manufacturing method thereof
CN108411207B (en) * 2018-04-11 2020-01-07 东北大学 Thin-specification hot-rolled dual-phase steel with tensile strength of 600MPa and manufacturing method thereof
CN110029269A (en) * 2019-03-29 2019-07-19 本钢板材股份有限公司 A kind of 800MPa grades of low cost tempering dual phase steel and preparation method thereof
CN114892095B (en) * 2022-06-01 2023-07-04 张家港扬子江冷轧板有限公司 High-strength weather-resistant steel for thin-specification S450NH carriage and preparation method thereof
CN115537661B (en) * 2022-10-08 2024-02-23 包头钢铁（集团）有限责任公司 600 MPa-level hot dip galvanized dual-phase steel for automobile structure and production method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072543A (en) * 1977-01-24 1978-02-07 Amax Inc. Dual-phase hot-rolled steel strip
US6488790B1 (en) * 2001-01-22 2002-12-03 International Steel Group Inc. Method of making a high-strength low-alloy hot rolled steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072543A (en) * 1977-01-24 1978-02-07 Amax Inc. Dual-phase hot-rolled steel strip
US6488790B1 (en) * 2001-01-22 2002-12-03 International Steel Group Inc. Method of making a high-strength low-alloy hot rolled steel

Also Published As

Publication number Publication date
US20040118489A1 (en) 2004-06-24
WO2004059026A2 (en) 2004-07-15

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