Vacuum treatment of molten metal with simultaneous stirring by helium injection
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United States of America Patent
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-
Jan 18, 2005
Grant Date -
Feb 26, 2004
app pub date -
Dec 11, 2002
filing date -
Mar 29, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vacuum treatment of cast metal in liquid form employing the steps of: introducing the cast metal in liquid form into a metallurgic ladle; filling the ladle until a guard height ranging between 0.4 and 0.6 m is reached; and treating the metal while bringing the atmosphere above the ladle under vacuum, and simultaneously stirring the cast metal by injecting helium into the base of the ladle during part of or the whole treatment.
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