Carbonitriding is a process of simultaneously infiltrating carbon and nitrogen into the steel surface at a temperature around 800-880˚C that lower than ordinary gas carburizing, and then hardened by quenching.

Gas Carbonitriding is performed by simultaneous nitriding and carburizing, by adding NH3 gas to the normal gas carburizing atmosphere and N component decomposed from NH3.

Since nitriding improve the hardenability, it enables processing of non-alloy steel such as SPCC and low carbon steel which cannot be applied with gas carburizing, and material cost reduction also become a great advantage.

In addition, because it can be quenched at a lower temperature than gas carburizing, deformation and distortion due to Heat Treatment can be reduced.