Gaseous Nitrocarburising

  • Gaseous Nitrocarburising involves the diffusion of nitrogen and carbon into the surface of carbon or alloy steels, producing a shallow epsilon-carbonitride compound layer supported by a deeper nitrogen penetration zone.
  • Ferritic Nitrocarburising – a gaseous process which will match or improve the salt bath nitrocarburising in respect of scuff and wear resistance, improved fatigue strength (up to 130% in mild steel) and corrosion resistance. Carried out at temperatures of 550°C-620°C this process can be modified to enhance corrosion resistance further whilst producing an aesthetic blue/black finish. 
  • Austenitic (short and standard) – applicable to delicate components that are subject to heavy distortion during traditional carbonitriding, and is also utilised to further impart indentation resistance. Standard austenitic nitrocarburising produces even higher indentation resistance with minimal distortion.  Carried out at temperatures of 590°C to 870°
  • Extended Austenitic – allows components to be imparted with heavy indentation resistance, extreme wear and corrosion resistance. The process may facilitate the replacement of expensive materials.
  • Improved wear resistance and enhanced corrosion resistance.
  • Minimal distortion and aesthetic appeal can be achieved.
  • Ferritic Nitrocarburising
  • Excellent Tribological properties – self-lubricating, high resistance to wear, scuffing, galling and seizure.
  • Improved fatigue strength.Post oxidation blue/black finish increases corrosion resistance.
  • Applicable to a very wide range of materials.
  • Austenitic Nitrocarburising
  • Indentation resistance by strengthening the substrate beneath the compound layer.
  • May allow a more economic material selection.
  • Good surface finish.
  • Minimal distortion.
  • Improved corrosion resistance.
  • Dependent on material type and process, total nitrogen penetration zone depths up to 0.6mm for Ferritic Nitrocarburising and up to 1mm for Austenitic and Extended Austenitic Nitrocarburising can be achieved.
  • Ferritic Nitrocarburising is suitable for the processing of carbon, carbon-manganese, low and many higher alloy steels, including all steels normally gas nitrided.
  • Typical surface micro-hardness values for ferritic nitrocarburised materials – Alloy steels quenched & tempered (+QT) – 500 to 750 HV1, Carbon steels +QT – 420 to 600 HV1, Carbon steels normalised – 300 to 500 HV1, SG / Ductile cast irons – 300 to 500 HV1
  • Austenitic and extended austenitic Nitrocarburising are suitable for mild steel and low alloy case hardening steels.
  • Ferritic Nitrocarburising is mainly applied to carbon, low alloy steels, certain SG and cast irons, and copper alloys, 080M40 (EN8), 070M55 (EN9), 150M19 (EN14), 150M36 (EN15), 070M20 (EN3).
  • Austenitic and Extended Austenitic Nitrocarburising are mainly applied to 080M40 (EN8), 150M19 (EN14), 150M36 (EN15), 070M20 (EN3).
  • Work envelope available 600mm wide x 1050mm long x 400mm Weight up to 600Kg.

James Menzies


Leonard Powell

Technical Planner

David Wright

Production Director

Mark Barron

Business Development Manager

Keighley Laboratories Ltd
Registered Office:
Croft House
South Street
West Yorkshire
BD21 1EG
Registered in England 164811
UK Tel: +44 (0)1535 664211

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