Method for under-pressure carburizing of steel workpieces
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United States of America Patent
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Jun 23, 2009
Grant Date -
Jan 26, 2006
app pub date -
Jul 2, 2003
filing date -
Oct 31, 2002
priority date (Note) -
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Abstract
The subject of this invention relates to method carburizing of steel products, mainly parts of machines, vehicles and every mechanical apparatus, in vacuum furnaces under reduced pressure and elevated temperature. The method of under-pressure carburizing of steel workpieces according to present invention relates to introduction of active nitrogen carrier during heating up of the load. Introduction of the active nitrogen carrier is terminated when the load reaches temperature required to start carburizing process; from this temperature the carbon carrier is added. Pressure in the furnace chamber during continuous or pulse introduction of the active nitrogen carrier should be maintained within the ranges from 1 to 500 mbar.
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