Metallurgical process

Details Metallurgical process Metallurgical process

1975-02-18

1977-05-03

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 59, C21C 534

Patent

active

040212335

ABSTRACT:
The carbon content in iron, cobalt, or nickel based alloys containing at least about 16% chromium is substantially eliminated without significant loss of chromium by blowing the alloy with oxygen to oxidize the carbon and simultaneously introducing steam or ammonia in amounts such that the partial pressure of carbon monoxide (formed by oxidation of carbon) is lower than that which corresponds to the equilibrium pressure for the carbon/chromium oxidation e.g. below 0.95 and preferably below 0.5 atmospheres.

REFERENCES:
patent: 3330645 (1967-07-01), DeMoustier
patent: 3751242 (1973-08-01), Knuppel

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