Stopper Rod for Delivering Gas Into a Molten Metal
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United States of America Patent
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Issued Date -
Sep 13, 2007
app pub date -
Jul 15, 2005
filing date -
Jul 20, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a stopper rod adapted to deliver gas during pouring of molten metal comprising a stopper body having an internal chamber and a gas discharge port, a bore connecting the internal chamber to the gas discharge port, the internal chamber and the bore defining a gas passageway. According to the invention, the walls of the gas passageway are provided with a layer of a material which will not produce carbon monoxide at the temperature of use. The stopper rod of the invention does not contaminate the gas passing therethrough.
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