Provided is a high-strength cold-rolled steel sheet excellent in terms of delayed fracture resistance and chemical convertibility characterized by having a tensile strength of 1180 MPa or more.
The high-strength cold-rolled steel sheet has a chemical composition containing, by mass%, C: 0.10% or more and 0.6% or less, Si: 1.0% or more and 3.0% or less, Mn: more than 2.5% and 10.0% or less, P: 0.05% or less, S: 0.02% or less, Al: 0.01% or more and 1.5% or less, N: 0.005% or less, Cu: 0.05% or more and 0.50% or less, and the balance being Fe and inevitable impurities, in which a steel sheet surface coverage of oxides mainly containing Si is 1% or less, a steel sheet surface coverage of iron-based oxides is 40% or less, Cu S /Cu B is 4.0 or less, and a tensile strength is 1180 MPa or more, where Cu S denotes a Cu concentration in a surface layer of a steel sheet and Cu B denotes a Cu concentration in base steel.