| 摘要 |
A bearing steel material which contains 0.8-1.1 mass% C, 0.15-0.8 mass% Si, 0.1-1.0 mass% Mn, 1.3-1.8 mass% Cr, up to 0.05 mass% P (0 mass% is excluded), up to 0.015 mass% S (0 mass% excluded), 0.0002-0.005 mass% Al, 0.0002-0.0020 mass% Ca, 0.0005-0.010 mass% Ti, up to 0.0080 mass% N (0 mass% is excluded), and up to 0.0025 mass% O (0 mass% is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass%, 20-50% CaO, 20-50% Al 2 O 3 , 20-70% SiO 2 , and 3-10% TiO 2 . |
