×

Hot dip Al coated steel sheet excellent in heat black discoloration resistance and method of production of same

  • US 9,464,345 B2
  • Filed: 06/21/2010
  • Issued: 10/11/2016
  • Est. Priority Date: 06/21/2010
  • Status: Active Grant
First Claim
Patent Images

1. A hot dip Al coated steel sheet which is excellent in heat black discoloration resistance which comprises a steel sheet which consists of, by mass %,C:

  • 0.0005 to less than 0.01%,Si;

    0.001 to 0.05%,P;

    0.002 to 0.1%,S;

    0.002 to 0.1%,Al;

    0.001 to 0.01%,N;

    0.0015 to 0.0040%O;

    0.03 to 0.08%,Mn;

    0.2 to 0.8%, andfurthermore, one or both ofNi;

    0.01 to 0.1% orCu;

    0.01 to 0.1%,satisfies 10×

    C+Ni+Cu>

    0.03, andhas a balance of Fe and unavoidable impurities,on the surface of the steel sheet is providedan Al coating layer which contains, by mass %, Si;

    4 to 11%, which has a balance of Al and unavoidable impurities, and which has a Knoop hardness of 90 to 110, the Al coating layer and the steel sheet interface having a less than 5 μ

    m thick Al—

    Fe—

    Si alloy layer between them.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×