Method for the thermal treatment of metal
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United States of America Patent
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Jun 18, 2002
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N/A
app pub date -
Apr 28, 2000
filing date -
Feb 4, 2000
priority date (Note) -
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Abstract
A method is provided for the thermal treatment of metal workpieces in a gas atmosphere containing nitrogen, in particular for nitrocarburizing iron articles. In order to obtain enhanced resistance to wear and corrosion in the treated workpieces, the nitrogen and carbon content present in the connecting layer of the case of the treated workpieces are intentionally adjusted by appropriately selecting the nitride coefficient K.sub.N and the carburizing coefficient K.sub.C of a reaction gas that contains ammonia, whereby hydrocarbons are added to the reaction gas for producing a relatively high carbon content in the connecting layer.
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