Stainless steel carburization process
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United States of America Patent
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Apr 23, 2013
Grant Date -
Jan 26, 2012
app pub date -
Dec 17, 2010
filing date -
Jul 21, 2010
priority date (Note) -
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Abstract
The present invention is directed to a process for tempering steel comprising carburizing said steel in a vacuum furnace in the presence of a hydrocarbon carburizing gas in combination with hydrogen wherein said carburizing gas/hydrogen combination is administered to the vacuum furnace by cyclically reducing the pressure in the furnace followed by the pulsed addition of the hydrocarbon carburizing gas consisting of an acetylene/hydrogen mixture is in a ratio of from about 1:1 to about 1:10 to replenish the air removed in the pressure reduction step.
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