| 摘要 |
A rolling bearing having a plurality of rolling elements located between a fixed race and a rotating race, wherein at least one of bearing components comprising the fixed race, rotating race and rolling elements is made of a steel which contains from 0.05 to 0.40 % by weight of at least one selected from the group consisting of Ti, Nb and Al along with from 0.65 to 1.20 % by weight of C, from 0.05 to 0.70 % by weight of Si, from 0.2 to 1.5 % by weight of Mn, from 0.15 to 2.0 % by weight of Cr, not more than 0.01 % by weight of N and unavoidable contaminating elements and wherein particles of at least one of Ti carbide, Ti carbonitride, Nb carbide, Nb carbonitride and Al nitride are dispersed and deposited at least in the vicinity of the surface of the at least one of bearing components. The rolling bearing suffers from few impressions on the raceway surface, has an elevated wear resistance, inhibits constitutional changes during rolling fatigue, prevents the enlargement of crystal grains in the step of hardening, achieves a long life and a high reliability even under contaminated lubrication or under clean lubrication, and scarcely undergoes corrosion pitting (including hydrogen induced cracking) even under such conditions as to cause corrosion pitting due to invasion of water. A bearing steel comprising 0.05 to 0.40% by weight of Ti and the above amounts of C, Si, Mn, Cr and N, is also disclosed, in which the titanium carbide or titanium carbonitride particles may have an average particle diameter of 20 nm or less in the vicinity of the surface. |
