| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing steel material extremely excellent in rolling fatigue properties and capable of preventing early peeling.SOLUTION: A bearing steel material contains C:0.8 to 1.1%, Si:0.15 to 0.8%, Mn:0.1 to 1.0%, Cr:1.3 to 1.8%, P:0.05% or less, S:0.015% or less, Al:0.0002 to 0.005%, Ca:0.0002 to 0.0020%, Ti:0.0005 to 0.010%, N:0.0080% or less (not including 0%), O:0.0025% or less (not including 0%), and an average composition of oxide-based inclusion contains CaO:20 to 50%, AlO:20 to 50%, SiO:20 to 70%, and TiO:3 to 10%. |
