Decarburizing molten metal

Details Decarburizing molten metal Decarburizing molten metal

1979-12-12

1981-04-07

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 52, 75 59, C21C 534

Patent

active

042604150

ABSTRACT:
An improved method of refining molten metal is disclosed comprising the steps of injecting a mixture of oxygen and an inert gas below the surface of molten metal at a high oxygen to inert gas ratio while utilizing from about 2.5 to 12% of the injected inert gas to shroud the remainder of the injected gaseous mixture. The oxygen to inert gas ratio is progressively decreased as the carbon content in the molten metal decreases and the temperature of the molten metal increases. The improvement of the present invention comprises supplying dry air to the remainder of the injected gaseous mixture in a quantity sufficient for the nitrogen in the dry air to fulfill the inert gas requirements for the remainder of the injected gaseous mixture, and for the oxygen in the dry air to fulfill at least a portion of the oxygen requirements for the injected gaseous mixture.

REFERENCES:
patent: 3046107 (1962-07-01), Nelson
patent: 3741557 (1973-06-01), Harbaugh
patent: 3748122 (1973-07-01), Ramachandran
patent: 3798025 (1974-03-01), Ramachandran
patent: 3832160 (1974-08-01), Bishop
patent: 3850617 (1974-11-01), Umowski
patent: 3861888 (1975-01-01), Heise
patent: 3930843 (1976-01-01), Fruehan

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