Case hardening / carburizing

Durofer-process | One-/two-salt systems | Solid carburizers | Carbonitriding

 

Carbonitriding

Carbonitriding is a thermochemical heat treating process, as is case hardening. During carbonitriding carbon, and to a lesser extent nitrigen, diffuse into the case of the work pieces. The main purpose of carbonitriding is to enhance the hardness and the wear resistance of unalloyed and low alloyed materials. The treatment is carried out between 750 and 900 °C for 1 - 12 hours in a salt bath which imparts carbon and nitrogen to the work pieces being treated. Generally speaking, the temperature for carbonitriding below A1 is between 700 and 800 °C, and for carbonitriding above A1it is between 800 and 850 °C.

Salts for carbonitriding

At a ratio of 1:1, Durferrit GS 540/C3 can be used as a carbonitriding bath for use above A1. If the GS content is higher, the bath will be too highly activated for use as a carbonitriding bath and will then act as a carburizing bath.

Products	Working temp.
Durferrit GS 540/C3	750° - 950° C

Durferrit C2 M and C7 carbonitriding baths are suitable for carbonitriding thin-walled metal parts above A1 to a case depth of about 0.2 mm.

Products	Working temp.
Durferrit C 2 M	750° - 860° C
Durferrit C 7	750° - 850° C

The Durferrit NS1 carbonitriding bath is suitable for use below A1. During this treatment, a thin compound layer is formed which consists of carbides and nitrides.

Products	Working temp.
Durferrit NS1	~700° C

 
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