Soft nitrided gear and method of fabricating the same

Details Soft nitrided gear and method of fabricating the same Soft nitrided gear and method of fabricating the same

1998-06-25

2000-07-25

Yee, Deborah

Metal treatment

Stock

Carburized or nitrided

148230, 148228, C22C 3822, C22C 3824, C23C 826, C21D 106

Patent

active

060932635

ABSTRACT:
A gear having high pitching resistance, sufficient surface hardness, sufficient hardened depth, high abrasion resistance, high breakage resistance, high fatigue resistance, and low gear noises. A material equivalent to JIS-SCM420 is soft nitrided for two hours in a mixture gas containing 45 to 65 volume % of residual NH.sub.3 at a gas temperature of 530 to 565.degree. C., thus producing a compound layer having a hardness equal to or higher than that of the material plus Hv 50 and a thickness of 200 .mu.m or more.

REFERENCES:
patent: 4531984 (1985-07-01), Madsac et al.

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