Invention Grant
- Patent Title: Cold-rolled steel sheet, galvanized cold-rolled steel sheet and method of manufacturing the same
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Application No.: US14891889Application Date: 2014-07-01
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Publication No.: US09970074B2Publication Date: 2018-05-15
- Inventor: Kaoru Kawasaki , Masaharu Kameda , Kohichi Sano , Riki Okamoto
- Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2013-138313 20130701; JP2014-070351 20140328
- International Application: PCT/JP2014/067532 WO 20140701
- International Announcement: WO2015/002190 WO 20150108
- Main IPC: C22C38/02
- IPC: C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/22 ; C21D8/04 ; C21D9/46 ; C23C2/06 ; C23C2/28 ; C23C2/40 ; C22C38/54 ; C22C38/12 ; C21D8/02 ; B32B15/01 ; C21D6/00 ; C22C38/00 ; C22C38/08 ; C22C38/10 ; C22C38/14 ; C22C38/16 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/42 ; C22C38/44

Abstract:
A cold-rolled steel sheet includes a predetermined chemical composition, and includes a structure expressed by: an area fraction of ferrite: 95% or more; an area fraction of retained austenite and an area fraction of martensite: 1% to 3% in total; a product of the area fraction of retained austenite and a carbon concentration in retained austenite: 1 or more; a value of I(111)/{I(100)+I(110)} at a region where a depth from a surface is ¼ of a thickness of the cold-rolled steel sheet when intensity of a (hkl) plane is expressed by I(hkl): 2 or less.
Public/Granted literature
- US20160130680A1 COLD-ROLLED STEEL SHEET, GALVANIZED COLD-ROLLED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME Public/Granted day:2016-05-12
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