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".
304 Stainless Steel after UltraGlow® Ion (Plasma) Nitriding:

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"Retaining Corrosion Resistance in Stainless Steels with S-Phase Nitriding"
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