Cold-rolled steel sheet, process for producing the same, and cell and process for producing the same

Cold-rolled steel sheet, process for producing the same, and cell and process for producing the same

  • CN 101,400,817 B
  • Filed: 03/13/2007
  • Issued: 06/30/2010
  • Est. Priority Date: 03/16/2006
  • Status: Active Grant
First Claim
Patent Images

1. cold-rolled steel sheet, % contains in qualityC:

  • 0.0040% is following, Si;

    0.02% is following,Below Mn;

    0.14~

    0.25%, the P;

    0.020%,S;

    0.015% is following, N;

    0.0040% is following,Al:

    0.020~

    0.070%



    Nb:

    0.020~

    0.030%



    Ti;

    0.005~

    0.030% andSatisfy the B of following formula (1) or formula (2),Surplus is made of Fe and unavoidable impurities,The average crystallite particle diameter of ferritic structure below 12.0 μ

    m,The intra-face anisotropy Δ

    r of r value is-0.20≤

    Δ

    r≤

    0.20;

    (A) at N-(14/48) Ti〉

    under 0 the situation,0003≤

    B-(11/14){N-(14/48)Ti}≤

    0.0010…

    (1)(B) under the situation of N-(14/48) Ti≤

    0,0003≤

    B≤

    0.0010…

    (2)Wherein, the symbol of element in formula (1), the formula (2) is represented the quality % content of each element.

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