Invention Grant
- Patent Title: Cold-rolled steel sheet and process for manufacturing same
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Application No.: US14379853Application Date: 2013-02-13
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Publication No.: US10526671B2Publication Date: 2020-01-07
- Inventor: Kengo Hata , Toshiro Tomida , Norio Imai , Jun Haga , Takuya Nishio
- Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Clark & Brody
- Priority: JP2012-036474 20120222
- International Application: PCT/JP2013/053312 WO 20130213
- International Announcement: WO2013/125399 WO 20130829
- Main IPC: C21D8/02
- IPC: C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/12 ; C22C38/14 ; C22C38/18 ; C22C38/26 ; C22C38/38

Abstract:
A high-strength cold-rolled steel sheet having excellent ductility and stretch flangeability includes: a chemical composition consisting, in mass %, C: 0.06 to 0.3, Si: 0.6 to 2.5%, Mn: 0.6 to 3.5%, P: at most 0.1%, S: at most 0.05%, Ti: 0 to 0.08%, Nb: 0 to 0.04%, total of Ti and Nb: 0 to 0.10%, sol.Al: 0 to 2.0%, Cr: 0 to 1%, Mo: 0 to 0.3%, V: 0 to 0.3%, B: 0 to 0.005%, Ca: 0 to 0.003%, REM: 0 to 0.003% and the remainder of Fe and impurities; a microstructure having a main phase including at least 40 area % in total of martensite and/or bainite; and a texture in which proportion of an average X-ray intensity in an {100} to {211} orientations relative to an average X-ray intensity of a random structure not having a texture is less than 6.
Public/Granted literature
- US20150027593A1 COLD-ROLLED STEEL SHEET AND PROCESS FOR MANUFACTURING SAME Public/Granted day:2015-01-29
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