发明授权
- 专利标题: Manufacturing method of a high-strength cold-rolled steel sheet having excellent uniform elongation and hole expandability
- 专利标题(中): 具有优异的均匀伸长率和扩孔性的高强度冷轧钢板的制造方法
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申请号: US14112187申请日: 2012-04-19
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公开(公告)号: US09458520B2公开(公告)日: 2016-10-04
- 发明人: Yuri Toda , Riki Okamoto , Nobuhiro Fujita , Kohichi Sano , Hiroshi Yoshida , Toshio Ogawa
- 申请人: Yuri Toda , Riki Okamoto , Nobuhiro Fujita , Kohichi Sano , Hiroshi Yoshida , Toshio Ogawa
- 申请人地址: JP Tokyo
- 专利权人: NIPPON STEEL & SUMITOMO METAL CORPORATION
- 当前专利权人: NIPPON STEEL & SUMITOMO METAL CORPORATION
- 当前专利权人地址: JP Tokyo
- 代理机构: Birch, Stewart, Kolasch & Birch, LLP
- 优先权: JP2011-095254 20110421
- 国际申请: PCT/JP2012/060634 WO 20120419
- 国际公布: WO2012/144567 WO 20121026
- 主分类号: C21D8/02
- IPC分类号: C21D8/02 ; C23C2/02 ; C23C2/06 ; C23C2/26 ; C23C2/28 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/12 ; C22C38/14 ; C22C38/08 ; C22C38/16 ; C22C38/22 ; C22C38/28 ; C22C38/32 ; C22C38/38 ; C21D9/46
摘要:
This high-strength cold-rolled steel sheet having excellent uniform elongation and hole expandability contains, C: 0.01 to 0.4%; Si: 0.001 to 2.5%; Mn: 0.001 to 4.0%; P: 0.001 to 0.15%; S: 0.0005 to 0.03%; Al: 0.001 to 2.0%; N: 0.0005 to 0.01%; and O: 0.0005 to 0.01%; in which Si+Al is limited to less than 1.0%, and a balance being composed of iron and inevitable impurities, in which at a sheet thickness center portion, an average value of pole densities of the {100} to {223} orientation group is 5.0 or less, and a pole density of the {332} crystal orientation is 4.0 or less, a metal structure contains 5 to 80% of ferrite, 5 to 80% of bainite, and 1% or less of martensite in terms of an area ratio and the total of martensite, pearlite, and retained austenite is 5% or less, and an r value (rC) in a direction perpendicular to a rolling direction is 0.70 or more and an r value (r30) in a direction 30° from the rolling direction is 1.10 or less.