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Gas Nitriding

Gas Nitriding

Gas nitriding is a surface hardening process, where nitrogen is introduced to the surface of steel parts using dissociated ammonia as the source. Gas nitriding develops a very hard case in a component at relatively low temperatures, without the need for quenching. The process is also applicable to tool steels such as hot-work, cold-work and mould steels. Typical applications include plastic machinery screw & barrel, gears, crankshafts, camshafts, cam followers, valve parts, springs, die-cast tooling, forging dies, aluminium-extrusion dies, injectors and plastic-moulds.

Why Gas Nitriding?

The formed hard layer imparts good wear resistance, fatigue strength, corrosive resistance & little or no dimensional change. Apart from this, the process contains specific advantages as listed below:

  • Precise control of nitrogen by controlling the gas flow rate which gives all-round nitriding effect
  • High dimensional stability & hardness, corrosion resistance & reduced coefficient friction
  • Parts can be masked to prevent hardening in some areas.
  • Large batch sizes are possible

Nitriding is most effective when applied to the range of steels containing nitride-forming elements such as aluminum, molybdenum, vanadium, and chromium.

The hardness achieved at the surface of steel varies from 900 VHN to 1100 VHN.

In Gas Nitriding, treatment time varies approximately from 20 hours to 220 hours. Final timing depends on the desired case depth & size of the steel parts.

We charge based on the weight (kg) of material, however, pricing depends on the maximum number of pieces that can be treated at once. For details, please contact us.