Metal treatment – Stock – Carburized or nitrided
Patent
1997-05-15
1998-09-01
Turner, Archene
Metal treatment
Stock
Carburized or nitrided
384492, 384912, 428469, 428698, C23C 822, F16C 3362
Patent
active
058006370
ABSTRACT:
In a rolling bearing in which at least one member of an inner race, outer race and rolling elements is made of an alloy steel containing 0.2 to 1.0 wt % of C, 3.0 to 14.0 wt % of Cr and 0.8 to 3.0 wt % of V, the balance being Fe, the member being carburized or carbonitrided, followed by hardening and tempering to secure that the surface carbon concentration C% and the concentrations Cr%+V% of Cr and V satisfy a relationship of C%.ltoreq.0.13 (Cr%+V%)+1.10 and that carbides existing on a surface of the member have an area fraction of 15 to 50%, the rolling bearing has an extending service life even if it is used under lubrication in the presence of foreign matter and exhibits superior wear resistance to be hard to wear even if there occurs a breakage of oil film.
REFERENCES:
patent: 5030017 (1991-07-01), Murakami et al.
patent: 5084116 (1992-01-01), Mitamura
patent: 5085733 (1992-02-01), Mitamura
patent: 5122000 (1992-06-01), Matsumoto et al.
patent: 5338377 (1994-08-01), Mitamura et al.
patent: 5352303 (1994-10-01), Murakami et al.
patent: 5427457 (1995-06-01), Furumura et al.
Wada Shuji
Yamamura Kenji
NSK Ltd.
Turner Archene
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