Method for reducing dissolved oxygen and carbon contents in molt

Details Method for reducing dissolved oxygen and carbon contents in molt Method for reducing dissolved oxygen and carbon contents in molt

1988-06-22

1989-03-07

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 5913, C21C 710

Patent

active

048102865

ABSTRACT:
The carbon and dissolved oxygen contents of molten steel are reduced by a vacuum degassing treatment which may employ oxygen blowing. A determination is made of the idealized trajectory or path reflecting the change in carbon content and dissolved oxygen content, between atmospheric pressure and a preselected sub-atmospheric pressure at which the vacuum degassing treatment occurs. The idealized trajectory also reflects the effect of extraneous factors on the carbon content, dissolved oxygen content and temperature of the molten steel during the treatment. A selection is made of the boundaries of the idealized trajectory based upon the permissible limits of carbon content, dissolved oxygen content and temperature at the end of the vacuum degassing treatment. Adjustments are made at the beginning of the treatment and periodically throughout the treatment to maintain all three parameters, carbon content, dissolved oxygen content and temperature, within the boundaries of the idealized trajectory. The adjustments employ procedures extraneous to the vacuum degassing treatment.

REFERENCES:
patent: 4541862 (1985-09-01), Finkl
patent: 4545815 (1985-10-01), Toth
patent: 4604137 (1986-08-01), Yamada

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