Steel Sheet, Steel Member, And Coated Steel Member

Abstract: In this steel member, a steel sheet base material, which comprises, by mass%, 0.10 to 0.65% of C, 0.10 to 2.00% of Si, 0.30 to 3.00% of Mn, 0.050% or less of P, 0.0100% or less of S, 0.010% or less of N, 0.010% or less of O, 0 to 0.100% of Ti, 0 to 0.0100% of B, 0 to 1.00% of Cr, 0 to 1.00% of Mo, 0 to 1.00% of Ni, 0 to 0.10% of Nb, 0 to 1.00% of Cu, 0 to 1.00% of V, 0 to 0.010% of Ca, 0 to 0.010% of Mg, 0 to 1.00% of Al, 0 to 1.00% of Sn, 0 to 1.00% of W, 0 to 1.00% of Sb, 0 to 1.00% of Zr, 0 to 1.00% of Co, 0 to 0.30% of REM, and the balance Fe and impurities, has a surface scale and a decarburized layer formed on the interface side with the scale, wherein the decarburized layer has an internal oxidized layer formed on the interface side with the scale, the depth of the decarburized layer from the interface between the steel sheet base material and the scale is 60 µm or greater, the depth of the internal oxidized layer from the interface is less than 40 µm, and the scale contains 70 mass% or more of Fe.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents