Simple ladle refining method
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United States of America Patent
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Oct 30, 2001
Issued Date -
N/A
app pub date -
Apr 25, 2000
filing date -
Aug 26, 1998
priority date (Note) -
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Abstract
The present invention provides a simplified ladle refining process capable of efficiently heating a molten steel in a short period of time while scattering and adhesion of splashes and erosion of refractories are suppressed. A simplified ladle refining process for refining a molten steel in a ladle comprising inserting an immersion snorkel into a ladle and blowing an oxidizing gas onto the surface of a molten steel within the immersion snorkel through a lance while the molten steel is being stirred by blowing an inert gas through the bottom of the ladle, wherein the lance has a ratio (d.sub.0 /d.sub.t) of a nozzle outlet diameter d.sub.0 (mm) to a nozzle throat diameter d.sub.t (mm) of from 1.2.alpha. to 2.5.alpha. wherein .alpha. is defined as a function of a back pressure.
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