Cold-rolled steel sheet, galvannealed steel sheet and processes for production of both

Cold-rolled steel sheet, galvannealed steel sheet and processes for production of both

  • CN 104,775,071 A
  • Filed: 03/04/2008
  • Published: 07/15/2015
  • Est. Priority Date: 03/05/2007
  • Status: Active Application
First Claim
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1. a cold-rolled steel sheet, is characterized in that,This cold-rolled steel sheet has following chemical composition:

  • in mass % containing C;

    0.0005 ~ 0.025%, below Si;

    0.2%, Mn;

    0.3 ~ 2.5%, below P;

    0.15%, below S;

    0.02%, below N;

    0.006%, more than sol.Al;

    0.0005% ~ be less than 0.005%, Ti;

    0.005 ~ 0.05% and Nb;

    0.020 ~ 0.200% and the mass ratio of Nb and Ti amount and Nb/Ti be less than more than 2 7.7, more than sol.Ti;

    0.004%, remainder is essentially Fe and impurity, the TiO in thickness of slab cross section xaverage number density be 30/mm 2above, the r value in direction at 45 ° and

    r with rolling direction 45be more than 1.80 and/or average r value and r mbe more than 1.60, and tensile strength is more than 340MPa.

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