发明申请
- 专利标题： HIGH-STRENGTH GALVANIZED STEEL SHEET EXCELLENT IN BENDABILITY AND MANUFACTURING METHOD THEREOF
- 专利标题（中）： 高韧性钢板优良的弯曲性及其制造方法
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申请号： US14234826申请日： 2012-07-27
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公开(公告)号： US20140212684A1公开(公告)日： 2014-07-31
- 发明人: Hiroyuki Kawata , Naoki Maruyama , Akinobu Murasato , Akinobu Minami , Takeshi Yasui , Takuya Kuwayama , Shigeru Yonemura
- 申请人： Hiroyuki Kawata , Naoki Maruyama , Akinobu Murasato , Akinobu Minami , Takeshi Yasui , Takuya Kuwayama , Shigeru Yonemura
- 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
- 优先权： JP2011-167436 20110729
- 国际申请： PCT/JP2012/069260 WO 20120727
- 主分类号： C23C2/02
- IPC分类号： C23C2/02 ; C21D8/02
摘要：
The present invention provides a high-strength galvanized steel sheet with maximum tensile strength of 900 MPa or more. The high-strength galvanized steel sheet has an alloyed galvanized layer formed on a surface of a base steel sheet containing predetermined amounts of C, Si, Mn, P, S, Al, N, O with a balance being constituted of iron and inevitable impurities, in which in a structure of the base steel sheet, retained austenite is limited to 8% or less in volume fraction, kurtosis K* of the hardness distribution between 2% hardness and 98% hardness is −0.30 or less, a ratio between Vickers hardness of surface layer of the base steel sheet and Vickers hardness of ¼ thickness of the base steel sheet is 0.35 to 0.70, and a content of iron in the alloyed galvanized layer is 8 to 12% in mass %.
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