Low Temperature Plasma Nitriding (DHIN S. Phase)

416 Stainless

416 Stainless

Low Temperature Plasma Nitriding is a recent development in the nitriding of stainless steels and iron superalloys. The process involves low temperature (350-450°C) nitriding and/or carburizing, which super-saturates the surface of the metal and expands the lattice. This expanded layer is sometimes referred to as the "S-Phase". Although no new phase is formed, the properties of the expanded layer are unique. The thin hard layer formed addresses wear resistance, chemical resistance, fretting resistance, corrosion performance, and other life limiting properties that plague stainless steels in demanding applications.


  • Thickness: 10-30 microns (0.0005-.0012in)
  • Hardness: 900-1300 HV
  • Enhanced corrosion and chemical resistance

Compatible Materials:

  • 300 series stainless steels such as 304 and 316
  • Precipitate hardening stainless steels (17-4ph, 15-5ph, 13-8Mo, A286)
  • Some martensitic stainless steels (410, 420)
  • Some duplex stainless steels
  • Some cobalt and nickel based alloys
Sample of 440C Stainless 303 Stainless Sample
17-4ph Etched with Marbles (Note the Resistance to Etchant) 17-4ph Etched with Marbles, 400X, Coating Thickness: 22 Microns