| 摘要 |
Disclosed are a high-strength cold-rolled steel sheet for press molding that is to be used in automobiles and so on, and a method for producing the same. Specifically disclosed is a high-strength cold-rolled steel sheet comprising, in terms of mass%, 0.015% exclusive to 0.10% exclusive of C, less than 0.40% of Si, 1.0% inclusive to 1.9% inclusive of Mn, 0.015% exclusive to 0.05% inclusive of P, 0.03% or less of S, 0.01% inclusive to 0.3% inclusive of sol. Al, 0.005% or less of N, less than 0.30% of Cr, 0.005% or less of B, less than 0.15% of Mo, 0.4% or less of V, and 0.02% or less of Ti with the balance consisting of iron and unavoidable impurities, which has such a composition as satisfying the requirement 0.6[%Si]+[%Cr]+2[%Mo]<0.35 and has a microtissue being composed of ferrite and 3-12%, in terms of volume, of a second phase and containing, as the second phase, 1.0-10% of martensite and 1.0-5.0% of residual γ, wherein the sum of martensite and residual γ in the second phase is 70% or more, the ratio of residual γ in the second phase is 30-80%, and the average particle diameter of the second phase is 0.9-5 μm. |
