This means that for hardened material it is necessary to temper above the nitriding temperature in order to avoid softening of the core during the nitriding process. It.... Apr 29, 2020 Ion nitriding (also known as plasma ion nitriding) is a surface hardening heat treatment that uses diffused nitrogen to form various nitrogen...9 pages. Practically only alloy steels are subjected to nitriding [5]. 1.2 Flame hardening. Flame hardening process where the heating of component surface is achieved