Since the parts are immersed in the Salt Bath, air cannot contact the work piece and scaling, oxidation and decarburization are avoided. Heat transfer into components is very rapid – much faster than with radiation or convection methods. Additionally, the uniform rate of heat transfer permits components having complex geometries and diverse cross-sections to be heat treated and quenched with minimal distortion. Salt Bath Hardening is ideal for Tool Steels.
Gears, shafts, machine parts and tools are often hardened in a salt bath. Partial hardening as well as the individual hardening of materials can easily be carried out with salt bath hardening.