Stainless steels have excellent corrosion resistance but possess relatively low strength and wear resistance. NANO-S™ expands their application range to include components that are subjected to intensive wear.

NANO-S™ is a surface hardening process that improves the wear and galling resistance of stainless-steel components without affecting the inherent corrosion resistance. The process diffuses nitrogen and/or carbon into the surface of the steel, creating a new phase structure, the S-Phase, which provides extremely high hardness. Because NANO-S™ is a fully controlled process, there is no formation of chromium nitrides/carbides and consequently no loss of corrosion inhibiting properties. The treatment produces a hardened layer that is ductile and up to 25 μm deep (0.001”).

Achieved at low temperatures less than 932°F (500°C), NANO-S™ does not induce distortion, which eliminates final machining. Finished parts are uniformly hardened even inside small bores, tight grooves and at sharp edges.


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Highly effective on Austenitic, precipitation hardening and duplex stainless steels.

  • No need for pre-processing preparation of the parts. In-furnace de-passivation and nitriding
  • Attains excellent wear resistance
  • Improves fatigue strength
  • Retains intrinsic corrosion properties
  • Prevents galling
  • Does not alter chemical composition of alloy
  • Has no effect on the steel’s non-magnetic nature
  • No change in the color, shape or size
  • Controls the thickness of the compound (white) layer and its properties
  • Eliminates closed nitride networks within the diffusion zone
  • Excellent control of the case depth
  • Uniformly hardened even small bores, tight grooves and sharp edges
  • Excellent control of the surface hardness
  • Very high level of repeatability of the process
  • Green technology, no waste pollution