Metal treatment – Stock – Carburized or nitrided
Patent
1992-12-02
1994-08-09
Yee, Deborah
Metal treatment
Stock
Carburized or nitrided
148226, 148229, 148406, C21D 106, C22C 3800
Patent
active
053363388
ABSTRACT:
A bearing component is prepared from a carburazing steel and having a surface hardness of 63 to 67 in terms of Rockwell hardness C and a surface retained austenite content of at least 20% to less than 25%. The bearing component is produced by a process including the step of carburizing and quenching a bearing component workpiece prepared from a carburizing steel and machined to a predetermined shape, the step of subjecting the resulting workpiece to a preliminary tempering treatment, the step of subjecting the tempered workpiece to a sub-zero treatment and the step of subjecting the treated workpiece to a main tempering treatment. Further, the bearing component is produced by another process including the step of carburizing and quenching a bearing component workpiece prepared from a carburizing steel and machined to a predetermined shape, the step of subjecting the resulting workpiece to a secondary hardening treatment and the step of subjecting the hardened workpiece to a main tempering treatment.
REFERENCES:
patent: 4904094 (1990-02-01), Furumura et al.
patent: 5122000 (1992-06-01), Matsumoto et al.
Patent Abstracts of Japan, vol. 014, No. 322 (C-0739), Jul. 10, 1990 & JP-A-21 15 344 (Koyo Seiko Co Ltd) Oct. 21, 1988.
Koyo Seiko Co. Ltd.
Yee Deborah
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