Metal treatment – Stock – Carburized or nitrided
Patent
1990-08-23
1992-02-04
Yee, Deborah
Metal treatment
Stock
Carburized or nitrided
148906, 148333, 384492, C22C 3818, C21D 936
Patent
active
050857339
ABSTRACT:
A rolling contact parts steel has C: 0.2-0.6 wt%; Si: 0.3-2.0 wt%; Cr: 0.5-2.5 wt%; Mn: 1.7 wt% or less; O: 12 ppm or less; and the balance of Fe and an inevitable impurity. The steel produces a fine carbide without the need for a separate heat treatment. The dimensioal stability at high temperature of the steel is superior. A rolling bearing has at least one of the races and the rolling element thereof made of the steel, the steel being carburized or carbonitrided, then quenched and then, finally, tempered. The one of the races and the rolling element will not soften at a high temperature.
REFERENCES:
patent: 3117041 (1964-01-01), Kolstinen
patent: 3275389 (1966-09-01), Neilson et al.
patent: 4004952 (1977-01-01), Jatczak et al.
patent: 4023988 (1977-05-01), Stickels et al.
patent: 4191599 (1980-03-01), Stickels et al.
patent: 4930909 (1990-06-01), Murakami et al.
Nippon Seiko Kabushiki Kaisha
Yee Deborah
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