“Steel Member, Steel Sheet, And Methods For Manufacturing Same”

Abstract: The present invention relates to a steel sheet characterized in that a chemical composition of the steel sheet consists of, by mass%, C: 0.25 to 0.60%, Si: 0.25 to 0.80%, Mn: 0.30 to 3.00%, P: 0.050% or less, S: 0.0100% or less, N: 0.010% or less, Ti: 0.010 to 0.100%, B: 0.0005 to 0.0100%, Cu: 0.15 to 1.00%, Mo: 0.10 to 1.00%, Cr: 0 to 1.00%, Ni: 0 to 1.00%, V: 0 to 1.00%, Ca: 0 to 0.010%, Al: 0 to 1.00%, Nb: 0 to 0.10%, Sn: 0 to 1.00%, W: 0 to 1.00%, Sb: 0 to 1.00%, REMs: 0 to 0.30%, and bal.: Fe and impurities, a maximum value of the content of Cu in a range of a depth from the surface of 0 to 30 μm is 1.2 times or more of the content of Cu

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