Steel composition for bearings and method of producing the same

Details Steel composition for bearings and method of producing the same Steel composition for bearings and method of producing the same

1996-03-25

1998-03-31

Yee, Deborah

Metal treatment

Stock

Ferrous

148622, 148906, C22C 3822, C21D 940

Patent

active

057333882

ABSTRACT:
Bearing steel materials that are superior in cold workability, machinability, hardenability and rolling contact fatigue life are provided. During the processing of steel materials, the generation of large carbides, that detrimentally affect the rolling contact fatigue life of the steel, is inhibited, thereby obviating the necessity of a heat treatment for dissolving the carbides. The present steel material contains the following alloy elements in percentage by mass: 0.55% to 0.82% of carbon; 0.05% to 0.20% of silicon; 0.50% or less of manganese; 0.90% to 1.30% of chromium; 0.05% to 0.30% of molybdenum; and the remaining percentage substantially of iron. After the spheroidizing annealing of the steel material, the total cross-sectional area rate of carbide is 25% or less.

REFERENCES:
patent: 3929523 (1975-12-01), Kinoshi et al.
patent: 4023988 (1977-05-01), Stickels et al.
patent: 4581079 (1986-04-01), Borik
patent: 5077003 (1991-12-01), Muraoka et al.
patent: 5186768 (1993-02-01), Nomoto et al.

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