ENVIRONMENTALLY FRIENDLY PROCESS FOR CARBONING STEEL IN THE SALZBAD.

摘要

1. Process for carburizing steel in a salt bath, characterised by the following process steps : a) the process container is charged with a first salt which consists of a mixture of an alkali halide and an alkaline earth halide ; b) the first salt is brought to a molten state ; c) an additional salt is added which consists of a mixture of an alkaline earth halide, an alkali ferrocyanide and an alkali cyanate, wherein the alkaline earth halide of the additional salt corresponds chemically to the alkaline earth halide of the first salt ; d) the container charge is heated to its operating temperature ; e) the workpiece to be treated is immersed in the charge in the carburizing bath and is left therein until the desired depth of carburizing is attained ; f) the workpiece is removed from the carburizing bath and, according to the type of material, is quenched in an appropriate quenching medium.