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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 

           1. gas 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.
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