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High strength galvanized steel plate excellent in adhesion of plated metal and formability in press working and high strength alloy galvanized steel plate and method for production thereof

  • US 6,517,955 B1
  • Filed: 12/29/2000
  • Issued: 02/11/2003
  • Est. Priority Date: 02/22/1999
  • Status: Expired due to Term
First Claim
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1. A high strength hot-dip galvanized steel sheet with excellent plating adhesion and press formability, the steel sheet containing in terms of weight percent,C:

  • 0.05-0.2%, Si;

    0.2-2.0%, Mn;

    0.2-2.5%, Al;

    0.01-1.5%, Ni;

    0.2-5.0%, P;

    <

    0.03% and S;

    <

    0.02% where the relationship between Si and Al is such that 0.4(%)≦

    Si(%)+0.8 Al(%)≦

    2.0% and the remainder consists of Fe and unavoidable impurities, characterized in that the volume percentage of the retained austenite in the steel sheet is 2-20% and the steel sheet surface wherein the relationship between the Ni and Si, Al in 0.5 μ

    m of the steel sheet surface layer is such that Ni(%)≧

    ¼

    Si(%)+⅓

    Al(%), has a Zn plating layer comprising Al;



    1% with the remainder Zn and unavoidable impurities.

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