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As an alternative to
salt-bath nitride hardening, the Reese Hardening Plants
and Messer Griesheim GmbH have developed the VARIO-Nitro-CARB-technique
- an ecologically safe nitrocarburization
procedure, in which pure synthetic gases are used. The
new nitriding method yields application-related
properties comparable to those obtained with salt-bath nitriding. The hardening process and the layer formation are also
comparable; since CO2 is used as an added gas, carbon is introduced into
the nitrided case as well.
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In comparison, however, the
VARIO-Nitro-CARB-process is considerably easier to
regulate. Through the use of added gases the nitride atmosphere can
within broad limits be adapted to the intended field of
application. This new nitriding
method, which is characterized by good reproducibility
and high operational reliability, has been successfully
employed by the Bochum Hardening Plant for several months
now. Especially suited for this purpose are all low- and
medium-alloy steels. 
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An
alternative to salt-bath nitride hardening