Steel article having a nitrided and partly oxidized surface and

Details Steel article having a nitrided and partly oxidized surface and Steel article having a nitrided and partly oxidized surface and

1977-04-06

1978-12-26

Peters, G. O.

Metal treatment

Compositions

Heat treating

148 315, C23C 1116

Patent

active

041314921

ABSTRACT:
Surface-hardening of a steel article which is to be mated with a separate article so as to make a sliding or rolling face-to-face contact is accomplished by heating the steel article in ammonia gas containing from 1 to 10% by volume of air. The treated article has an oxidized layer as an outmost part of a nitride layer. The oxidized layer abrades more readily than the nitride layer, so that the article has the property of smoothly fitting a separate article practically from the start of use and exhibits a good wear resistance during subsequent use.

REFERENCES:
patent: 2513302 (1950-07-01), Felid
patent: 3748195 (1973-07-01), Kondo et al.
patent: 3802933 (1974-04-01), Rausch et al.
patent: 3943010 (1976-03-01), Hartline
patent: 4017336 (1976-01-01), Fordulis
Floe, C. F., "Heat Treating and Forging" Nov. 1943, pp. 587-590.

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