发明授权
- 专利标题： High-strength hot rolled steel sheet being free from peeling and excellent in surface properties and burring properties, and method for manufacturing the same
- 专利标题（中）： 没有剥离的高强度热轧钢板以及表面性能和翻边性能优异的方法及其制造方法
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申请号： US12532782申请日： 2008-03-27
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公开(公告)号： US08157933B2公开(公告)日： 2012-04-17
- 发明人: Tatsuo Yokoi , Kazuya Ootsuka , Yukiko Yamaguchi , Tetsuya Yamada
- 申请人： Tatsuo Yokoi , Kazuya Ootsuka , Yukiko Yamaguchi , Tetsuya Yamada
- 申请人地址： JP Tokyo
- 专利权人： Nippon Steel Corporation
- 当前专利权人： Nippon Steel Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Birch, Stewart, Kolasch & Birch, LLP
- 优先权： JP2007-082567 20070327
- 国际申请： PCT/JP2008/055913 WO 20080327
- 国际公布： WO2008/123366 WO 20081016
- 主分类号： C21D11/00
- IPC分类号： C21D11/00 ; C21D9/46 ; C22C38/00 ; C22C38/02
摘要：
This hot rolled steel contains, in terms of mass %, C: 0.01 to 0.1%, Si: 0.01 to 0.1%, Mn: 0.1 to 3%, P: not more than 0.1%, S: not more than 0.03%, Al: 0.001 to 1%, N: not more than 0.01%, Nb: 0.005 to 0.08%, and Ti: 0.001 to 0.2%, with a remainder being iron and unavoidable impurities, wherein a formula: [Nb]×[C]≦4.34×10−3 is satisfied, a grain boundary density of solid solution C is not less than 1 atom/nm2 and not more than 4.5 atoms/nm2, and a grain size of cementite grains precipitated at grain boundaries within the steel sheet is not more than 1 μm.
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