发明名称 |
HIGH-STRENGTH GALVANIZED STEEL SHEET HAVING SUPERIOR BENDABILITY AND METHOD FOR PRODUCING SAME |
摘要 |
<p>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 1/4 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%.</p> |
申请公布号 |
EP2738280(A4) |
申请公布日期 |
2015.08.05 |
申请号 |
EP20120820441 |
申请日期 |
2012.07.27 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
KAWATA, HIROYUKI;MARUYAMA, NAOKI;MURASATO, AKINOBU;MINAMI, AKINOBU;YASUI,TAKESHI;KUWAYAMA, TAKUYA;YONEMURA, SHIGERU |
分类号 |
C22C38/00;B21B3/00;C21D9/46;C22C18/00;C22C38/06;C22C38/58;C23C2/06;C23C2/26;C23C28/00 |
主分类号 |
C22C38/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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