Method of controlling furnace atmospheres

Details Method of controlling furnace atmospheres Method of controlling furnace atmospheres

1983-04-04

1984-05-01

Sheehan, John P.

Metal treatment

Compositions

Heat treating

148 166, 148 203, C21D 148

Patent

active

044459459

ABSTRACT:
Disclosed is a method of controlling the atmosphere of a heat-treating furnace whose atmosphere consists essentially of a carrier gas of CO, H.sub.2 and N.sub.2 produced from a mixture of methanol and nitrogen. In accordance with the present invention, the ratio of flow of methanol to flow of nitrogen is varied to maintain the CO content of the furnace atmosphere at a predetermined value. This renders more effective the control by conventional means of the flow of additive gases to maintain the carbon potential of the furnace atmosphere at a predetermined value. The flows of methanol and nitrogen may be controlled based on monitored CO content only, or their control may be interrelated to monitored carbon potential as well.

REFERENCES:
patent: 2459618 (1949-01-01), Carter
patent: 2818246 (1957-12-01), Kappel
patent: 3693409 (1972-09-01), Yamagishi
patent: 4145232 (1979-03-01), Solomon
patent: 4175986 (1979-11-01), Ewalt et al.
patent: 4249965 (1981-02-01), Schultz
patent: 4288062 (1981-09-01), Gupta et al.
The Condensed Chemical Dictionary, 8th ed., 1971, p. 452.

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