3. Liquid treatment: case-hardening and cyanidation (carbonitriding) in a salt bath
The liquid medium is a bath of molten salts rich in carburizing or carbonitriding products, in which the parts are immersed. This process, which was highly developed until the 1970s, has been greatly reduced, and has even disappeared in countries subject to environmental regulations.
The main reasons for this are linked to the cyanide nature of these baths. Cyanide-free formulations have been developed to overcome this problem, but the relative effectiveness of these formulations and the constraints of even cyanide-free salt baths have prevented this technique from maintaining its position in relation to gaseous processes.
3.1 Cyanide salt baths
In these baths, the product supplying the carbon is always an alkaline cyanide, sodium...
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Liquid treatment: case-hardening and cyanidation (carbonitriding) in a salt bath
Gaseous treatment
Bibliography
Article M 1 225
Standards and norms
French Standards Association (AFNOR)
Steel standards
- Aciers à dispersoïdes destinés au forgeage à chaud. Demi-produits et barres. - A 33-111 - 10.87
- Aciers de construction non alliés et alliés spéciaux pour cémentation. Nuances. Demi-produits, barres et fils machine. - NF A 35-551 - 7.86
- Aciers pour tempe et revenu. Partie 1 : conditions techniques de livraison des aciers spéciaux (indice...
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