1. gas nitriding
- Nitriding is a heat treating process that alloys nitrogen onto the surface of a metal to create a case hardened surface. Three methods are there for nitriding
2. salt bath nitriding.
3. plasma nitriding.
- Nitriding is a surface-hardening heat treatment that introduces nitrogen into the surface of steel at a temperature range (500 to 550°C or 930 to 1020°F), while it is in the ferrite condition.
- Thus, nitriding is similar to carburizing in that surface composition is altered, but different in that nitrogen is added into ferrite instead of austenite.
- Because nitriding does not involve heating into the austenite phase field and a subsequent quench to form martensite, nitriding can be accomplished with a minimum of distortion and with excellent dimensional control.