Low alloy steel carburization and surface microalloying process
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United States of America Patent
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Feb 16, 2016
Grant Date -
Jun 11, 2015
app pub date -
Dec 11, 2013
filing date -
Jul 21, 2010
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Abstract
The present invention is directed to a process for carburizing low alloy 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 gas mixture in a ratio of from about 1:1 to about 1:10 at increased temperature disassociate the carbon from the gas and deposit it only on the surface of said steel and not on the surface of the furnace. The continued application of increased temperature at reduced pressure causes the deposited carbon to diffuse below the surface of the steel towards the core resulting in a carburized low alloy steel product with increased hardness, ductility and improved resistance to corrosion.
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