Atmosphere compositions and methods of using same for surface tr

Details Atmosphere compositions and methods of using same for surface tr Atmosphere compositions and methods of using same for surface tr

1975-12-22

1977-09-20

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

148 165, 148 166, 252372, 148 27, C21D 148, B23K 3534, C01B 200

Patent

active

040494721

ABSTRACT:
Atmosphere compositions and processes utilizing the compositions for heat treating ferrous metal articles under a controlled furnace atmosphere to either maintain or change the surface chemistry of the article being treated are disclosed in the following specification.
The invention features atmosphere compositions or mixtures which are blended from normally gaseous components outside the furnace and the mixture or blend is injected into the furnace to provide a carburizing, decarburizing, carbonitriding or neutral hardening atmosphere inside the furnace.

REFERENCES:
patent: 3229967 (1966-01-01), Engelhard
patent: 3330773 (1967-07-01), De Hart
patent: 3663315 (1972-05-01), Hoffman et al.

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