Kolsterising
Kolsterising involves a large amount of carbon being diffused into the steel. This creates a compressive stress which causes a strong hardening of the surface, but does not effect the corrosion resistance.
Stainless steel with an austenitic structure, which has low wear resistance and hardness, is given a hardening of the surface in this process.
See also
Brinell hardness test
Performing the hardness test by means of a ball pressure test according to the Swedish engineer Johann August Brinell.
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