HOT-DIP ZINC-COATED STEEL SHEET OR ALLOYED HOT-DIP ZINC-COATED STEEL SHEET HAVING SUPERIOR STRENGTH-BENDABILITY BALANCE WITH TENSILE STRENGTH OF 1180 MPa OR MORE

摘要

This hot-dip zinc-coated steel sheet has a region that satisfies a predetermined chemical composition and contains at least 0.2% by mass of Zn in a solid solution, the region being present 5 µm or more in the depth direction of the matrix from the boundary between the coated layer and the steel plate, the Vickers hardness of a steel plate surface layer portion at 15 µm or more in the depth direction of the matrix from the boundary between the coated layer and the steel plate being 80% or less of that of the matrix center portion, and the structure excluding the martensite and bainite of the steel plate being 5% or less in terms of the area ratio.