You can get more info by posting in the Metal and Metallurgy engineering, forum330.
A keyword search for Nitrocarburizing gives 10 threads:
Info I posted in 2 additional threads which may be useful. Note that Kolsterising® isn’t nitrocarburizing, but rather, a relatively low-T carburizing.
From
How to increase 304 SS hardness
thread330-49696:
“Bodycote (
has a relatively new Kolsterising® process for case hardening austenitic SS without loss of corrosion resistance. Similar or identical to i/the process TEV described.
“Wherever components are subjected to severe wear and corrosion attack.” Also useful for duplex SS & some nickel-based alloys (best corrosion resistance is for ferrite-free alloys containing some molybdenum).
"Kolsterising is a case-hardening process primarily for austenitic stainless steels. Wear resistance and resistance to galling is improved, while corrosion resistance remains unchanged.
The process involves diffusion of carbon into the work piece surface without the formation of chromium carbides. Post treatment surface hardness is equivalent to between 70 and 74 HRc. Standard case depths offered are 22 or 33 microns."
No change in dimension, so the treatment could easily be used for existing product lines. It also eliminates the galling problem of SS, so sounds like a winner.”
From
Tuftride treatment
thread330-63253 {link doesn’t work, but I save my posts!}
“The Tufftride® (also known as Melonite® and Tenifer®) nitrocarburizing process belongs to HEF Durferrit, a German company. The English version of their website is at
About the only info on this site is that “This nitrocarburizing process has undergone continuous development with regard to its regenerability and ecology,” i.e., control parameters may have changed.
The most informative site I found is
Another site with descriptions of the various Tufftride® processes is at
Description of both the Tufftride® process and the Melonite® variation are at
Hope this helps,
Ken