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Article | REF: M1225 V1

Carbon carburizing and carbonitriding - Processes

Author: Claude LEROUX

Publication date: September 10, 2011

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4. Gaseous treatment

4.1 Gas cementation and carbonitriding (at atmospheric pressure)

The treatment is carried out in a sealed furnace in which a controlled atmosphere is maintained at slight overpressure, consisting of a carrier gas to which is added, if necessary, a carbon enrichment gas and, in addition, nitrogen in the case of carbonitriding, to achieve the desired carbon potential.

The main case-hardening reactions are :

2CO⇄CO2+CCO⇄C+1/2O2CO+H2⇄H2O+C

...

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