发明授权
US08084143B2 High-yield-ratio and high-strength thin steel sheet superior in weldability and ductility, high-yield-ratio high-strength hot-dip galvanized thin steel sheet, high-yield ratio high-strength hot-dip galvannealed thin steel sheet, and methods of production of same
有权
高屈服比和高强度薄钢板，其焊接性和延展性优良，高产率高强度热浸镀锌薄板，高产率高强度热浸合金化热镀锌薄钢板，以及 生产方法相同
- 专利标题： High-yield-ratio and high-strength thin steel sheet superior in weldability and ductility, high-yield-ratio high-strength hot-dip galvanized thin steel sheet, high-yield ratio high-strength hot-dip galvannealed thin steel sheet, and methods of production of same
- 专利标题（中）： 高屈服比和高强度薄钢板，其焊接性和延展性优良，高产率高强度热浸镀锌薄板，高产率高强度热浸合金化热镀锌薄钢板，以及 生产方法相同
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申请号： US10574053申请日： 2004-09-30
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公开(公告)号： US08084143B2公开(公告)日： 2011-12-27
- 发明人: Naoki Yoshinaga , Shunji Hiwatashi , Yasuharu Sakuma , Atsushi Itami
- 申请人： Naoki Yoshinaga , Shunji Hiwatashi , Yasuharu Sakuma , Atsushi Itami
- 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： Kenyon & Kenyon, LLP
- 优先权： JP2003-341152 20030930; JP2003-341456 20030930
- 国际申请： PCT/JP2004/014790 WO 20040930
- 国际公布： WO2005/031024 WO 20050407
- 主分类号： C22C38/12
- IPC分类号： C22C38/12 ; C22C38/14
摘要：
High yield ratio high-strength thin steel sheet superior in weldability and ductility characterized by: being comprised of steel containing, by mass %, C: over 0.030 to less than 0.10%, Si: 0.30 to 0.80%, Mn: 1.7 to 3.2%, P: 0.001 to 0.02%, S: 0.0001 to 0.006%, Al: 0.060% or less, N: 0.0001 to 0.0070%, containing further Ti: 0.01 to 0.055%, Nb: 0.012 to 0.055%, Mo: 0.07 to 0.55%, B: 0.0005 to 0.0040%, and simultaneously satisfying 1.1 ≦14×Ti(%)+20×Nb(%)+3×Mo(%)+300×B(%)≦3.7, the balance comprised or iron and unavoidable impurities, and having a yield ratio of 0.64 to less than 0.92, a TS×E11/2 of 3320 or more, an YR×TS×EL1/2 of 2320 or more, and a maximum tensile strength (TS) of 780 MPa or more.
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