Metal treatment – Stock – Carburized or nitrided
Patent
1995-07-26
1996-10-01
Yee, Deborah
Metal treatment
Stock
Carburized or nitrided
148906, C23C 832, C23C 822
Patent
active
055607870
ABSTRACT:
One of component parts of an inner race, an outer race and rolling elements of a rolling bearing is composed of a bearing material that is prepared by working a high-speed steel, carburizing or carbonitriding the wrought steel in a temperature range from 800.degree. C. to less than 1200.degree. C. and subsequently hardening and tempering the carburized or carbonitrided steel, the steel composing of 0.2 wt %.ltoreq.C.ltoreq.2.3 wt %, Si.ltoreq.1.0 wt %, Mn.ltoreq.1.0 wt %, 2.0 wt %.ltoreq.Cr.ltoreq.7.0 wt %, 1.5 wt %.ltoreq.W.ltoreq.22.0 wt %, Mo.ltoreq.10.0 wt %, 0.5.ltoreq.V.ltoreq.6.0 wt %, Co.ltoreq.18.0 wt %, the balance Fe and incidental impurities. By carburizing or carbonitriding the steel at low temperatures less than 1,200.degree. C., not only high core toughness is insured but also the dissolved C or N in the surface is compensated to increase the hot strength of the steel and the compressive stress that remains in the surface after heat treatment, so that the rolling bearing that rotate at high speed and high temperatures of more 400.degree. C. extends the service life.
REFERENCES:
patent: 4191599 (1980-03-01), Stickels et al.
Furumura Kyozaburo
Ohori Manabu
Takagi Masaaki
Yamamura Kenji
NSK Ltd.
Yee Deborah
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