A method for manufacturing a quenching steel plate, a quenching member, and a quenching steel plate

摘要

One aspect of the present invention is a quenching steel sheet characterized by satisfying the specified composition of components and further having a Mn concentration satisfying the following formula (1). S1 + S2 -10 x [Mn] +44 (1) [Mn]: Mn concentration (mass%) of steel sheet analyzed by inductively coupled plasma emission spectroscopy S1: Area% of a region in which the concentration of Mn analyzed by an electron beam microprobe analyzer is at least twice as large as the above [Mn], in a structure at 1/4 plate thickness of the steel sheet. S2: area% of a region in which the concentration of Mn analyzed by an electron beam microprobe analysis system is 0.5 times or less of the above [Mn] in the structure at 1/4 plate thickness of the steel sheet.