Jfe Steel Corporation

Setsuo Kakihara

Susumu Satoh

Atsushi Miyazaki

Mineo Muraki

Yoshihiro Ozaki

Toshihiro Kasamo

Toshimitsu Nagaya

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)&#xd7;14/50+(Nb+Zr)&#xd7;14/90; and the balance being Fe and incidental impurities.

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Chiba, Japan

Setsuo Kakihara