A martensitic stainless steel sheet which is hard to be softened by tempering
caused
by heating during the use of a disk brake, can maintain the predetermined hardness,
and has excellent punching workability, bending workability before quenching, and
a particularly small shear drop, and in which a predetermined hardness after quenching
is constantly achieved, in a low carbon martensitic stainless steel sheet used
only after quenching. Specifically, the sheet contains, on the basis of mass percent,
0.030% to 0.100% C; 0.50% or less of Si; 1.00% to 2.50% Mn; more than 10.00% to
15.00% Cr; at least one selected from the group consisting of 0.01% to 0.50% Ti,
0.01% to 0.50% V, 0.01% to 1.00% Nb, and 0.01% to 1.00% Zr; N in an amount defined
by the following expression, N: 0.005% to (Ti+V)14/50+(Nb+Zr)14/90;
and the balance being Fe and incidental impurities.
