发明授权
- 专利标题: Manufacturing method of a high-strength cold-rolled steel sheet having excellent local deformability
- 专利标题(中): 具有优异的局部变形性的高强度冷轧钢板的制造方法
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申请号: US14110891申请日: 2012-04-12
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公开(公告)号: US09347122B2公开(公告)日: 2016-05-24
- 发明人: Yoshihiro Suwa , Kazuaki Nakano , Kunio Hayashi , Riki Okamoto , Nobuhiro Fujita , Kohichi Sano
- 申请人: Yoshihiro Suwa , Kazuaki Nakano , Kunio Hayashi , Riki Okamoto , Nobuhiro Fujita , Kohichi Sano
- 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: JP2011-089250 20110413
- 国际申请: PCT/JP2012/060065 WO 20120412
- 国际公布: WO2012/141263 WO 20121018
- 主分类号: C21D8/02
- IPC分类号: C21D8/02 ; C21D8/04 ; C22C38/22 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/12 ; C22C38/14 ; B32B15/01 ; C22C38/08 ; C22C38/10 ; C22C38/16 ; C22C38/26 ; C22C38/28 ; C22C38/38 ; C21D9/46
摘要:
This high-strength cold-rolled steel sheet contains, in mass %, C: 0.02% to 0.20%; Si: 0.001% to 2.5%; Mn: 0.01% 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 an area ratio of bainite in a metal structure is 95% or more, at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100} to {223} orientation group is 4.0 or less, and a pole density of the {332} crystal orientation is 5.0 or less, and a mean volume diameter of crystal grains in the metal structure is 7 μm or less.
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