High strength cold-rolled steel plate and manufacturing method therefor

High strength cold-rolled steel plate and manufacturing method therefor

  • CN 104,364,403 A
  • Filed: 05/29/2013
  • Published: 02/18/2015
  • Est. Priority Date: 05/31/2012
  • Status: Active Application
First Claim
Patent Images

1. a high strength cold rolled steel plate, is characterized in that, has following one-tenth and is grouped into:

  • contain respectivelyC;

    0.05 ~ 0.30 quality %,Below Si;

    3.0 quality % and containing 0 quality %,Mn;

    0.1 ~ 5.0 quality %,Below P;

    0.1 quality % and containing 0 quality %,Below S;

    0.02 quality % and containing 0 quality %,Al;

    0.01 ~ 1.0 quality %,Below N;

    0.01 quality % and not containing 0 quality %,Surplus is made up of iron and inevitable impurity,And have with undertissue;

    Using area occupation ratio containing 20 ~ 50% the ferrite as soft first-phase,Surplus is formed by as the tempered martensite of hard second phase and/or tempering bainite,From difference Δ

    V α

    =V α

    s-V α

    c of the ferritic area occupation ratio V α

    c of the central part of ferritic area occupation ratio V α

    s and the t/4 ~ 3t/4 of the steel plate skin section till surface of steel plate to the 100 μ

    m degree of depth lower than 10%, and the hardness Hvs of described steel plate skin section is 0.75 ~ 1.0 with the ratio RHv=Hvs/Hvc of the hardness Hvc of described central part, and wherein t is thickness of slab.

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