| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability, by providing a steel rolling member superior in seizure resistance needless to say to be superior in heat resistance and core part toughness, when used in high temperature-high speed rotation. SOLUTION: Among a pair of bearing rings and rolling bodies, at least one rolling member is formed of alloy steel including C : 0.1 to 0.5 wt.%, Si : 0.1 to 1.5 wt.%, Mn : 0.1 to 1.5 wt.%, V : 0.8 to 2.0 wt.%, Cr : 3 to 5 wt.%, Mo : 3 to 5 wt.% and Ni : 2.5 to 4.5 wt.%, and is quenched after applying carbonitriding treatment, and is secondarily hardened by further applying annealing, and is set to the C concentration of a surface layer : 0.6 to 1.5 wt.%, the N concentration of the surface layer : 0.1 to 0.5 wt.%, hardness of the surface layer : Hv 650 to 950 and core part hardness being a non-carbonitriding part : Hv 400 to 550. COPYRIGHT: (C)2006,JPO&NCIPI
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