Rolling bearing

Details Rolling bearing Rolling bearing

1997-02-21

1999-02-23

Yee, Deborah

Metal treatment

Stock

Carburized or nitrided

148319, 148906, 384492, C22C 3818, C23C 832

Patent

active

058739564

ABSTRACT:
In order to provide rolling bearings of high performance using case hardened stainless steels that are superior to the conventional martensite base stainless steels in terms of corrosion resistance, rolling fatigue strength and wear resistance and which also have high core toughness, at least one member of the rolling bearing selected from among the inner race, the outer race and the rolling elements is made of an alloy steel consisting essentially of less than 0.5 wt % C, 8.0 to 20.0 wt % Cr, 0.1 to 1.5 wt % Mn, 0.1 to 2.0 wt % Si and the balance of Fe and incidental impurity elements; the relationship between the C and Cr contents satisfies 0.04 Cr (wt %)-0.39.ltoreq.C (wt %).ltoreq.-0.05 Cr (wt %)+1.41; the bearing also has a surface layer that is formed by nitriding or carbonitriding at a temperature below Ac.sub.1, subsequent heating at a temperature of 900.degree. to 1,200.degree. C., hardening, a subzero treatment and tempering.

REFERENCES:
patent: 5292200 (1994-03-01), Matsumoto et al.
patent: 5424028 (1995-06-01), Maloney et al.
Eckstein, Hans-Joachim: Technologie der Warmebehandlung von Stahl, 2., stark uberarb. Aufl. Leipzig: VEB Deutscher Verlag fur Grundstoffindustrie, 1987, pp. 174-176 and 236-241.

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