Plasma nitriding

Plasma nitriding — the largest sub-contract facility in Britain

Increases wear resistance, surface hardness and fatigue by generation of a hard layer at the outer surface.


  • Improves wear resistance

  • Improves fatigue strength

  • Improves basic strength

  • Reduces friction

  • Reduces galling

How plasma nitriding works

Plasma nitriding works by diffusing nitrogen into the surface of a steel component in a vacuum furnace. The nitrogen combines with alloying elements (ie chrome, molybdenum) in the steel to form a hard nitride layer (ie chrome nitride, molybdenum nitride). Plasma nitriding is successfully carried out at a lower temperature and at a greater rate than gas nitriding, enabling components to be treated without the loss of base hardness and without distortion.



  • Modern surface hardening process using nitrogen

Cost effectiveness

  • No need for grinding after plasma nitriding
  • Prolongs component life
  • Save on plant downtime
  • Facilitates the use of smaller sections for a given applied load


  • Approved to ISO9001:2008
  • Low treatment temperature
  • No distortion
  • Retains base hardness

Suitable materials

  • Most alloy steels containing chromium and molybdenum.
  • High alloy steels which also contain aluminium, tungsten and vanadium
  • Austenitic and martensitic stainless steels
  • Cast irons

Hardness profile

  • Up to 1200 VPN
  • Up to 0.6mm

Effective masking

  • Plasma Nitride selected areas of component only

Range of components

  • Shafts and extruder screws up to 6m long suspended during treatment
  • Gears, pins, moulds rolls, dies

High repeatability

  • Accurate control of plasma nitriding treatment parameters
  • Repeat items plasma nitrided identically