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Nitrex Gas Nitriding System

June 8, 2017

Gas nitriding is a process that uses dissociated ammonia to diffuse nitrogen into the surface of various types of steel. The diffusion produces a case hardness on to the part, ultimately improving wear resistance and fatigue strength. There should be little to no distortion of the part as nitriding typically takes place below the transformation levels and the final tempering temperature for steels. Generally, temperatures range between 900F-1000F and do not require a quench to finish the process. Parts to be nitrided should be finished their machining process, as the nitride will produce an extremely hard surface on to the part.

In addition to nitriding through gas, we can now nitrocarburize through gas as well. This simply means that instead of transferring nitrogen into the surface of steel parts, we also can transfer carbon into steel during the same process. This creates an improved wear surface with higher fatigue strength. The atmosphere for nitrocarburizing is slightly different as it includes carbon monoxide and hydrogen. An added benefit of nitrocarburizing is that the cooling rate is commonly faster than nitriding. It is recommended to make the cooling rate as mild as possible to avoid a compound layer formation.


  • Gas Nitriding
  • Nitrocarburizing
  • Tool & Die
  • Automotive
  • Precision Parts
  • Military
  • Aerospace