Jfe Steel Corporation

Toshimitsu Nagaya

Susumu Satoh

Atsushi Miyazaki

Mineo Muraki

Yoshihiro Ozaki

Toshihiro Kasamo

Setsuo Kakihara

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.

Growing community of inventors

Chiba, Japan

Toshimitsu Nagaya