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Structural carbon and alloy steels and maraging steels,prior to being put into the nitriding furnace shall be submitted to hardening and tempering and/or one or more stress reliefs(refer to UNI EN10052),carried out at a temperature exceeding the sulphur nitriding temperature and properly included in the machining cycle.
The last heat treatment shall be performed prior to carrying out the last machining that has to ensure the complete removal of all and any decarburization
The remaining ferrous materials as per step 3 above shall be submitted,prior to sulphurnitriding,to all those heat treatments aiming at ensuring a structural homogeinity and minimum internal stresses of parts
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