| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel sheet which exhibits stable corrosion resistance and thermal stability when used for a long time as a brake disc material, and a brake disk which is produced from the steel sheet.SOLUTION: The steel sheet for a brake disc has a composition which contains, in mass%, 0.02 to <0.10% C, ≤0.6% Si, >0.5 to 2.0% Mn, ≤0.06% P, ≤0.01% S, ≤0.05% Al, 11.0 to 13.5% Cr, 0.01 to 0.30% Ni, 0.10 to 0.60% Nb, 0.03 to <0.10% N and >0.0010 to 0.0060% B, and further satisfying desired relational formula, and the balance Fe with inevitable impurities, and in which hardness after quenching is 32 to 40 HRC by HRC (regarding a C scale in Rockwell hardness). |
