| 摘要 |
There are provided a steel sheet having stable corrosion resistance and the stability of heat resistance over a long period of use when the steel sheet is used as a brake-disc material, and a brake disc produced from the steel sheet. Specifically, a steel sheet for a brake disc contains, on a mass percent basis, 0.02% or more and less than 0.10% C, 0.6% or less Si, more than 0.5% and 2.0% or less Mn, 0.06% or less P, 0.01% or less S, 0.05% or less Al, 11.0% to 13.5% Cr, 0.01% to 0.30% Ni, 0.10% to 0.60% Nb, 0.03% or more and less than 0.10% N, more than 0.0010% and 0.0060% or less B, and the balance being Fe and incidental impurities, in which the steel sheet satisfies desired relational expressions, and the steel sheet after quenching has a hardness of 32 HRC to 40 HRC in terms of Rockwell hardness scale C (HRC). |
