Steel sheet for hot pressing use, method for producing same, and hot press steel sheet member

Steel sheet for hot pressing use, method for producing same, and hot press steel sheet member

  • CN 104,583,437 A
  • Filed: 08/15/2013
  • Published: 04/29/2015
  • Est. Priority Date: 08/15/2012
  • Status: Active Application
First Claim
Patent Images

1. a hot pressing steel plate, is characterized in that:

  • its in mass %, have byMore than C;

    0.08% and lower than 0.20%,Si:

    0.003%



    0.2%



    Mn:

    1.6%



    3.5%



    sol.Al:

    0.0002%



    2.0%



    B:

    0.0003%



    0.01%



    Below P;

    0.1%,Below S;

    0.004%,Below N;

    0.01%,Ti;

    when N content being expressed as [N], 0% ~ 0.04+48/14 ×

    [N] %,Cr:

    0%



    1.00%



    Bi:

    0%



    0.5%



    Ca:

    0%



    0.05%



    Mg:

    0%



    0.05%



    REM:

    0%



    0.05%



    Mo:

    0%



    1%



    Cu:

    0%



    1%



    Ni:

    0%



    1%



    W:

    0%



    1%



    Nb:

    0%



    1%



    V;

    0% ~ 1%, andRemainder;

    Fe and the chemical composition represented by impurity;

    When Mn content is expressed as [Mn], C content is when being expressed as [C], and formula (1) is set up,[Mn]+6.67×

    [C]-

    2.73≥

    0 (1);

    And in area occupation ratio, have byBainite;

    1% ~ 95%,Ferrite;

    5% ~ 94%, andRemainder;

    be selected from the one kind or two or more represented structure of steel among pearlite, martensite and retained austenite.

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