发明授权
- 专利标题： Method for manufacturing high strength hot-rolled steel sheet having excellent stretch flangeability and fatigue resistance
- 专利标题（中）： 具有优异的拉伸凸缘性和耐疲劳性的高强度热轧钢板的制造方法
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申请号： US13699028申请日： 2011-05-30
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公开(公告)号： US09222155B2公开(公告)日： 2015-12-29
- 发明人: Nobuyuki Nakamura , Hayato Saito , Katsumi Nakajima , Yoshimasa Funakawa , Noriaki Moriyasu , Takayuki Murata
- 申请人： Nobuyuki Nakamura , Hayato Saito , Katsumi Nakajima , Yoshimasa Funakawa , Noriaki Moriyasu , Takayuki Murata
- 申请人地址： JP
- 专利权人： JFE Steel Corporation
- 当前专利权人： JFE Steel Corporation
- 当前专利权人地址： JP
- 代理机构： DLA Piper LLP (US)
- 优先权： JP2010-125080 20100531; JP2011-115595 20110524
- 国际申请： PCT/JP2011/062857 WO 20110530
- 国际公布： WO2011/152541 WO 20111208
- 主分类号： C22C38/02
- IPC分类号： C22C38/02 ; C21D9/46 ; C22C38/28 ; C22C38/06 ; C21D8/02 ; C22C38/14 ; C21D8/04 ; C22C38/00 ; C22C38/58 ; C22C38/12 ; C22C38/16 ; C22C38/60
摘要：
A high strength hot-rolled steel sheet has a tensile strength of not less than 780 MPa and exhibits excellent stretch flangeability and excellent fatigue resistance. A steel has a composition containing C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.005%, Ti at 0.05 to 0.15%, Al at 0.005 to 0.10% and N at not more than 0.007%.