Process for producing steel having a low content of nitrogen in a ladle furnace
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United States of America Patent
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Feb 5, 1991
Grant Date -
N/A
app pub date -
Aug 24, 1989
filing date -
Aug 29, 1988
priority date (Note) -
Expired
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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.
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