发明公开
EP2762592A1 HIGH-STRENGTH HOT-DIPPED GALVANIZED STEEL SHEET AND HIGH-STRENGTH ALLOYED HOT-DIPPED GALVANIZED STEEL SHEET, EACH HAVING TENSILE STRENGTH OF 980 MPA OR MORE, EXCELLENT PLATING ADHESION, EXCELLENT FORMABILITY AND EXCELLENT BORE EXPANDING PROPERTIES, AND METHOD FOR PRODUCING SAME
有权
高强度热浸镀锌钢板和高强度合金化热浸镀锌钢板与每个980兆帕拉伸强度或多个突出的镀覆粘合性,良好的加工性和未决BOHRAUFWEITUNGSEIGENSCHAFTEN及其制造方法
- 专利标题: HIGH-STRENGTH HOT-DIPPED GALVANIZED STEEL SHEET AND HIGH-STRENGTH ALLOYED HOT-DIPPED GALVANIZED STEEL SHEET, EACH HAVING TENSILE STRENGTH OF 980 MPA OR MORE, EXCELLENT PLATING ADHESION, EXCELLENT FORMABILITY AND EXCELLENT BORE EXPANDING PROPERTIES, AND METHOD FOR PRODUCING SAME
- 专利标题(中): 高强度热浸镀锌钢板和高强度合金化热浸镀锌钢板与每个980兆帕拉伸强度或多个突出的镀覆粘合性,良好的加工性和未决BOHRAUFWEITUNGSEIGENSCHAFTEN及其制造方法
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申请号: EP12837548.2申请日: 2012-09-28
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公开(公告)号: EP2762592A1公开(公告)日: 2014-08-06
- 发明人: WAKABAYASHI, Chisato , AZUMA, Masafumi , FUJITA, Nobuhiro , SANO, Kohichi
- 申请人: Nippon Steel & Sumitomo Metal Corporation
- 申请人地址: 6-1, Marunouchi 2-chome Chiyoda-ku Tokyo 100-8071 JP
- 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: 6-1, Marunouchi 2-chome Chiyoda-ku Tokyo 100-8071 JP
- 代理机构: Vossius & Partner
- 优先权: JP2011216967 20110930
- 国际公布: WO2013047830 20130404
- 主分类号: C22C38/00
- IPC分类号: C22C38/00 ; C21D9/46 ; C22C18/00 ; C22C38/60 ; C23C2/02 ; C23C2/06 ; C23C2/28
摘要:
Provided is a high-strength hot-dip galvanized steel sheet having excellent plating adhesion, formability, and hole expandability with an ultimate tensile strength of 980 MPa or more, the hot-dip galvanized steel sheet comprising a hot-dip galvanized layer formed on a surface of a base steel sheet. The base steel sheet contains, by mass%, C: 0.05% to 0.4%; Si: 0.01% to 3.0%; Mn: 0.1% to 3.0%; Al: 0.01 to 2.0%; in which Si + Al > 0.5%, P: limited to 0.04% or less; S: limited to 0.05% or less; N: limited to 0.01% or less; and a balance including Fe and inevitable impurities, a microstructure of the base steel sheet contains 40% or more by total volume fraction of martensite and bainite, 8% or more by volume fraction of residual austenite, and a balance of the microstructure being ferrite or ferrite and 10% or less by volume fraction of pearlite. The martensite contains 10% or more by total volume fraction of two or more kinds of three kinds of martensites (1), (2), and (3), and the hot-dip galvanized layer contains less than 7 mass% of Fe.
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