Alloyed hot-dip galvanized steel sheet
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United States of America Patent
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Nov 10, 2015
Grant Date -
Sep 11, 2014
app pub date -
Sep 28, 2012
filing date -
Sep 28, 2012
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Abstract
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.
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