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Low Temperature S-Phase Nitriding

When austenite is saturated with a significant amount of nitrogen or carbon, which expands its lattice, the S-layer forms.


The Low Temperature / S-Phase Nitriding Process

Since plasma is very effective in removing the passive layer of a chromium oxide formed naturally on the surface of stainless steel, UltraGlow® Ion (Plasma) Nitriding is widely used to harden (especially selective harden) stainless steel parts. Specifically, a very well-developed process that can be carried out by either carburizing or nitriding; such processes produce a so-called “S-phase".

Common Materials for S-Phase Nitriding

  • 304
  • 316
  • 2205

Benefits of S Phase Nitriding for Stainless Steels

  • Enhanced corrosion resistance
  • Protection from cavitation & erosion
  • The layer is approx. 10-15 micrometers thick
  • Increased surface hardness
  • Ability for selective heat treatment
  • Often used in oil, gas and marine industries

304 Stainless Steel

304 Stainless Steel after UltraGlow® Ion (Plasma) Nitriding

Download our White Paper:
"Retaining Corrosion Resistance in Stainless Steels with S-Phase Nitriding"

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