Bearing steel bearing member having excellent thermal resistance

Details Bearing steel bearing member having excellent thermal resistance Bearing steel bearing member having excellent thermal resistance

1995-11-30

1998-07-14

Zimmerman, John J.

Stock material or miscellaneous articles

Composite

Of metal

148335, 420109, 420111, 384492, 384625, 384912, 384913, C22C 3844, C22C 3846, F16C 3330

Patent

active

057801657

ABSTRACT:
There is disclosed a bearing member which is enhanced in toughness without lowering the hardness of a core portion so as to prevent an instantaneous rupture of the bearing member, and is excellent in rolling fatigue service life characteristics. Martensitic Fe-based bearing steel of the invention contains, by weight, not more than 0.4% carbon, not more than 2% silicon, not more than 2% manganese, not more than 5% nickel, 3.5 to 7.0% chromium, at least one of tungsten and molybdenum an tungsten equivalent defined by less than 1.1% vanadium. A ratio of Cv/Ceq is not more than 0.3 where Cv represents a carbon equivalent of carbide-forming elements defined by precipitation of MC carbides is suppressed, and M.sub.2 C-type carbides larger in morphology than MC-type carbides are dispersed in an appropriate amount, thereby enhancing a rupture toughness value.

REFERENCES:
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patent: 5030017 (1991-07-01), Murakami et al.
patent: 5084116 (1992-01-01), Mitamura
patent: 5131964 (1992-07-01), Spitzer
Machine Design, Rolling Elements Bearings, Jun. 22, 1972, pp. 59-75.

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