Carbonitriding
Variant of carburising where nitrogen (up to 0.5%) is diffused with carbon
- applicable to most steels
- maximum case hardness ~800VHN
- carried out at 800oC to 950oC in gas or salt bath
- slower process due to lower temperature
- nitrogen increases hardenability of carburised layer
- thicker cases possible in steels with no alloying elements