Process for hardening iron-containing surfaces with organic solv

Details Process for hardening iron-containing surfaces with organic solv Process for hardening iron-containing surfaces with organic solv

1975-09-08

1977-08-16

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

148 166, 148 203, 148 315, C21D 148

Patent

active

040424286

ABSTRACT:
This invention relates to a method of carbonitriding an iron-containing article. The method comprises the steps of subjecting the article to a carbonitriding atmosphere which atmosphere contains ammonia and an oxygen-containing organic solvent. The ratio of the oxygen atoms to the carbon atoms in the solvent is from about 0.5 to 1.5; and maintaining the article in the carbonitriding atmosphere until at least the surface of the article has increased its carbon and nitrogen content a predetermined amount.
Inasmuch as the carbonitriding treatment of the instant invention has a propensity to produce "HCN" which is well-known noxious gas, as well as NH.sub.3 and CO, it is also within the method of the instant invention to mix the gases used initially to contact the iron-containing article with a fuel gas and remove such a mixture of gases from the furnace where the mixture is subsequently burned thereby decomposing and detoxifying the HCN contained in the exhaust gas.

REFERENCES:
patent: 2703298 (1955-03-01), Branson et al.
patent: 3387032 (1968-06-01), Leonard
patent: 3413161 (1968-11-01), Goehring
patent: 3748195 (1973-07-01), Kondo et al.
patent: 3783007 (1974-01-01), Bloom et al.
Karrer; P., Organic Chemistry, New York, 1938, pp. 76-77.

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