Heat treatment processes utilizing H.sub.2 O additions

Details Heat treatment processes utilizing H.sub.2 O additions Heat treatment processes utilizing H.sub.2 O additions

1978-11-22

1980-06-17

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 166, 148 203, C21D 148

Patent

active

042082242

ABSTRACT:
In a process for carburizing ferrous parts, nitrogen gas is supplied to the vestibule of an integral quench furnace while a gaseous carbon source is supplied without a carrier gas to the furnace hot zone. H.sub.2 O is introduced into the hot zone at the rate of 0.1-15 ml/min such that upon vaporization thereof a furnace hot zone atmosphere is formed which includes up to about 40% nitrogen, at least 14% CO and 40% H.sub.2. Subsequent to carburizing, parts may be annealed or bright hardened in the same furnace by increasing the H.sub.2 O flow rate to the hot zone to establish an atmosphere comprised of at least 60% H.sub.2.

REFERENCES:
patent: 2085597 (1937-06-01), Marshall
patent: 4049473 (1977-09-01), Davis et al.
patent: 4108693 (1978-08-01), L'Hermite et al.

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