Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1989-08-24
1991-02-05
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75558, G21C 534
Patent
active
049901834
ABSTRACT:
The present invention relates to a process for producing steel in a ladle furnace in which the molten steel is stirred by injection of an inert gas in the lower part of the furnace. According to the invention, the stirring of the bath of steel is effected by the injection of gaseous argon so as to distribute in a homogeneous manner the additives added and the metal temperature in the course of the treatment, while there is simultaneously injected liquid argon above the surface of the bath in the region of intumescence. In this way, substantially any increase in the concentration of nitrogen of the bath of steel in the course of the treatment is avoided. In some cases, and in particular when wires of the type filled with silico-calcium are employed, a reduction in the concentration of nitrogen in the bath of steel is found.
REFERENCES:
patent: 3971655 (1976-07-01), Takashima
patent: 4382817 (1983-05-01), Vayssiere
patent: 4517015 (1985-05-01), Inaba
Anderson Sara H.
Foulard Jean
Lutgen Noel
L'Air Liquide
Liquid Air Corporation
Rosenberg Peter D.
Societe Anonyme pour l'Etude et l'Exploitation des Procedes Geor
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