The difference beetwen KOLSTERISING hard face treatment and STELLITE.
Stellite is a commercial name of a cobalt-chrome alloy available in different grades and with high wear resistance features (Deloro is the proprietary of the trademark).Kolsterising is a low temperature diffusion process used to create a high resistance carbon layer (from the surface towards the centre of the material for about 20 – 40 µm). The carbon diffused in the forged steel valve lattice increases hardness and produces beneficial effects (fatigue resistance) due to induced compressive stress.Stellite 6B is one of the best wear resistant material, but the problem is its price. Stainless alloys such as S20161 and S21800, have gained popularity due to their more competitive price coupled with good properties of wear resistance (cavitation erosion and galling) and they can be regarded as good replacements for Stellite in valve and pump applications.
Kolsterised austenitic products also offer a good resistance to galling (adhesive wear), as despite of the increased hardness, the diffused carbon layer keeps a good degree of deformability.
The corrosion resistance of the austenitic matrix is also not affected by the treatment, and this a great achievement  if compared to the effect produced by other thermal diffusing treatment, such as nitriding.

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