Carbonitriding is a process in which Carbon and Nitrogen are simultaneously infiltrated into the surface of steel at a temperature of about 800℃ to 880℃, lower than ordinary gas carburizing (850℃ - 940℃).
After the part has been heat-treated, then the quenching part is needed to immediately start. Quenching is also the critical step in the carbonitriding heat treatment, which can be cool heated metal in water or oil in order to obtain desired material properties.
Since it can be quenched at a lower temperature than gas carburizing, deformation and distortion due to heat treatment can be reduced. Hence, the process is suitable for non-alloy steel and low carbon steel that would not achieve a hardened surface in standard gas carburizing.