发明名称 |
ALLOYED HOT-DIP GALVANIZED STEEL SHEET |
摘要 |
A high-strength alloyed hot-dip galvanized steel sheet obtained by subjecting the surface of a high-strength steel sheet to alloyed hot-dip galvanization, and formed from a steel sheet containing, in mass %, main components, and containing at least 40 vol % bainite and/or martensite, 8-60 vol % retained austenite, and less than 40 vol % ferrite, with the remainder comprising unavoidable structures. In the alloyed hot-dip galvanized steel sheet, the total thickness of the Gamma1 layer and the Gamma layer (Tgamma1+Tgamma) is 2 μm or less in the alloy layers formed by hot-dip galvanization, and the Gamma1 phase/Gamma phase thickness ratio (Tgamma1/Tgamma) is 1 or less. A tensile strength of 980 MPa or above can be easily imparted to the alloyed hot-dip galvanized steel sheet. The alloyed hot-dip galvanized steel sheet has excellent coating adherence, and coating separation during machining can be suppressed. |
申请公布号 |
US2014255725(A1) |
申请公布日期 |
2014.09.11 |
申请号 |
US201214348247 |
申请日期 |
2012.09.28 |
申请人 |
Nippon Steel & Sumitomo Metal Corporation |
发明人 |
Yamanaka Shintaro;Fujita Soshi;Sato Koichi |
分类号 |
C23C2/02;C23C2/28;C21D8/02 |
主分类号 |
C23C2/02 |
代理机构 |
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代理人 |
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主权项 |
1. An alloyed hot-dip galvanized steel sheet, which is a steel sheet comprising, in mass %,
C: from 0.10 to 0.4%, Si: from 0.01 to 0.5%, Mn: from 1.0 to 3.0%, O: 0.006% or less, P: 0.04% or less, S: 0.01% or less, Al: from 0.1 to 3.0%, and N: 0.01% or less, with the balance being Fe and unavoidable impurities, wherein the structure of the steel sheet further comprises, in terms of volume fraction, 40% or more of the total content of bainite and martensite, from 8 to 60% of retained austenite, and less than 40% of ferrite, with the balance being an unavoidable structure, and alloying hot-dip galvanization is applied to the steel sheet surface, and wherein the total thickness of the thickness Tγ1 of Γ1 layer and the thickness Tγ of Γ layer in the alloyed hot-dip galvanized layer is 2 μm or less and the ratio (Tγ1/Tγ) of thickness between Γ1 phase and Γ phase is 1 or less. |
地址 |
Tokyo JP |