Process for manufacturing a galvannealed steel sheet by DFF regulation

Process for manufacturing a galvannealed steel sheet by DFF regulation

  • CN 101,809,182 A
  • Filed: 06/06/2008
  • Published: 08/18/2010
  • Est. Priority Date: 06/29/2007
  • Status: Active Grant
First Claim
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1. preparation has the method for the galvanizing coating annealed steel sheets of TRIP microstructure, and described TRIP microstructure comprises ferrite, residual austenite and optional martensite and/or bainite, said method comprising the steps of:

  • -provide weight ratio to form the steel sheets that comprises following element;

    0.01≤

    C≤

    0.22%

    0.50≤

    Mn≤

    2.0%

    0.5<

    Si≤

    2.0%

    0.005≤

    Al≤

    2.0%

    Mo<

    0.01%

    Cr≤

    1.0%

    P<

    0.02%

    Ti≤

    0.20%

    V≤

    0.40%

    Ni≤

    1.0%

    Nb≤

    0.20%



    The surplus of forming is an iron and from the unavoidable impurities of melting,The described steel sheets of-oxidation is so that form oxide ferroelectric layer on the surface of steel sheets, and form be selected from down organize in the subscale of at least a oxide compound;

    Si oxide compound, Mn oxide compound, Al oxide compound, comprise Si and Mn composite oxides, comprise the composite oxides of Si and Al, the mixture that comprises the composite oxides of Al and Mn and comprise Si, Mn and Al.The steel sheets of the described oxidation of-reduction, so that the reducing iron oxides layer,-to described reductive steel sheets carry out galvanizing with the steel sheets that forms zinc-base and apply andThereby-make the steel sheets of described zinc-base coating stand Alloying Treatment formation zinc coating annealed steel sheets.

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