Invention Grant
- Patent Title: Cold-rolled steel sheet and production method thereof
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Application No.: US14004562Application Date: 2012-03-28
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Publication No.: US09670569B2Publication Date: 2017-06-06
- Inventor: Takayuki Nozaki , Manabu Takahashi , Nobuhiro Fujita , Hiroshi Yoshida , Shinichiro Watanabe , Takeshi Yamamoto
- Applicant: Takayuki Nozaki , Manabu Takahashi , Nobuhiro Fujita , Hiroshi Yoshida , Shinichiro Watanabe , Takeshi Yamamoto
- 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: JP2011-070725 20110328
- International Application: PCT/JP2012/058199 WO 20120328
- International Announcement: WO2012/133563 WO 20121004
- Main IPC: C21D8/02
- IPC: C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/18 ; C22C38/16 ; C22C38/20 ; C22C38/38 ; C22C38/26 ; C22C38/10 ; C22C38/28 ; C22C38/34 ; C21D9/46 ; B32B15/01 ; C22C38/60 ; C23C2/02 ; C23C2/06 ; C23C2/28 ; C23C2/40 ; C21D8/04

Abstract:
This is a cold-rolled steel sheet includes, by mass %, C: 0.02% to 0.4%, Si: 0.001% to 2.5%, Mn: 0.001% to 4.0%, and Al: 0.001% to 2.0%. The sum of the Si content and the Al content is 1.0% to 4.5%. An average pole density of an orientation group from {100} to {223} is 1.0 to 6.5, and a pole density of a crystal orientation {332} is 1.0 to 5.0. A microstructure includes, by an area ratio %, 5% to 80% of ferrite, 5% to 80% of bainite, and 2% to 30% of retained austenite. In the microstructure, by an area ratio %, martensite is limited to 20% or less, pearlite is limited to 10% or less, and tempered martensite is limited to 60% or less.
Public/Granted literature
- US20140000765A1 COLD-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREOF Public/Granted day:2014-01-02
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