Method of cooling metal parts that have undergone a nitriding / nitrocarburizing treatment in molten salt bath, the installation for the implementation of the procedure and the treated metal parts

摘要

Method of cooling metal parts that have undergone a nitriding / nitrocarburizing treatment in molten salt bath, characterized in that: - before the end of said treatment, it is filled with cooling agent, in liquid form and having a strong expansion capacity volumetric during its vaporization, an enclosure (1) arranged to evacuate the oxygen contained in said enclosure, in order to create an inert atmosphere, - the set of the treated pieces is transferred to the enclosure (1) at a minimum speed of 6 m / min, - the enclosure (1) is closed, - the pieces are left in the enclosure for a determined duration to reach a temperature, according to which the salt curdles and constitutes a protection barrier, - the pieces that are removed are removed. undergo a rinsing operation.