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Post-Oxidation Nitriding


This is a thermochemical treatment through which the superficial layer of a steel is enriched of nitrogen and carbon. Such process creates and an enforced layer that increases the hardness of the superficial layer: after the process of surface enrichment we will move onto a controlled and induces oxidation of the artefact, in an oven set under specific temperatures. This process is facilitated by the action of specific gases that generate an oxide veil of a few microns thickness giving it a typical black colouring.


  • Increase of superficial hardness;
  • Improved resistance to wear and tear;
  • Improved resistance to stress;
  • Less Friction;
  • 96 hours resistance in salt fogs according to UNI norms.


From 0.05 to 0.30 mm


The product appears neat and in a shade of homogeneous black.


  • Nitriding steels;
  • Steel used for tools;
  • Carbon Steels;
  • Tempering Steels;
  • Low carbon steels;
  • Cast-steels