Method of nitriding steel

Details Method of nitriding steel Method of nitriding steel

1978-12-26

1980-08-05

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 121, 148 203, 266286, C21D 148

Patent

active

042160332

ABSTRACT:
Method of nitriding steel surfaces by circulating thereover a ternary mixture of ammonia, hydrogen and water at an elevated temperature and atmospheric pressure. Most of the harmful effects of HCN formation are avoided by utilizing a furnace lining consisting of a coated nickel base alloy, and by adding from 1 to 3% water to the nitriding gas and flowing the nitriding gas at a rate as low as 5 to 20 cu. ft. per hour per 100 sq. ft. of steel surface area.

REFERENCES:
patent: 2392267 (1946-01-01), Salkover
patent: 3343999 (1967-09-01), Petermann
patent: 3399085 (1968-08-01), Knechtel et al.
patent: 3620518 (1971-11-01), Winter
patent: 3684590 (1972-08-01), Podgurski

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