Gas soft-nitriding method

Details Gas soft-nitriding method Gas soft-nitriding method

1981-01-19

1982-08-03

Sheehan, John P.

Metal treatment

Compositions

Heat treating

148 165, C21D 148

Patent

active

043426050

ABSTRACT:
A gas soft-nitriding method which comprises a step of subjecting iron parts to a gas soft-nitriding treatment in a heat treating furnace at a temperature of approximately 550.degree. C.-620.degree. C. in a mixed atmosphere which comprises, when introduced into the furnace, 10%-30% ammonia gas, 2.5%-4.5% total carbon monoxide, and a balance of N.sub.2 gas or an exothermic gas on a volume basis. Thereby, the iron parts are provided with superior fatigue and wear resistance qualities, while production costs and the cost of the treated parts are substantially reduced.

REFERENCES:
patent: 3748195 (1973-07-01), Kondo et al.
patent: 4003764 (1977-01-01), Wunning
patent: 4035203 (1977-07-01), L'Hemite et al.
patent: 4049472 (1977-09-01), Arndt
patent: 4163680 (1979-08-01), Syrchikov et al.

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