Method of gas carburizing

Details Method of gas carburizing Method of gas carburizing

1977-02-03

1979-05-01

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 27, C21D 148

Patent

active

041521773

ABSTRACT:
Gas carburizing is carried out in a subsantially closed furnace in an atmosphere initially containing hydrogen with just enough methane (or other suitable hydrocarbon gas) to provide sufficient carbon for carburization at a temperature above the austenitic transformation temperature of a ferrous metal workpiece. For each volume of methane that decomposes at the surface of the workpiece in the carburization process, two volumes of hydrogen are generated. A small amount of natural gas is fed into the furnace to maintain the carbon content of the atmosphere, and a small quantity of the predominantly hydrogen carburizing mixture is bled from the furnace to maintain a desired pressure.

REFERENCES:
patent: 2161162 (1939-06-01), Harsch
patent: 2184972 (1939-12-01), Darratt
patent: 2275133 (1942-03-01), Davis
patent: 2287651 (1942-06-01), Turin
patent: 2827407 (1958-03-01), Carlson et al.
patent: 3796615 (1974-03-01), Westeren et al.
patent: 3925109 (1975-12-01), Nilsen
Metals Handbook, 8th Ed., vol. 2, 197, pp. 93 & 104-107.

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