Esterer Gießerei - Tempering

Tempering is a process of heat treatment which follows hardening. The aim is to influence the mechanical characteristics of a cast to the desired level. The modification in this case occurs in the whole casting part, thus from the surface to the centre. If the tempering process is done directly after hardening, we call it annealing.

A central procedure with tempering is the heating up of the product to the so called tempering temperature and the subsequent cooling to room temperature. The tempering temperature level is defined by the desired hardness and the material variety. The length of the process depends on the diameter and the size of the parts and on the quantity.

Through the process of tempering we can increase the ductility of a cast up to the desired level and with a decrease in hardness. When tempering a steel cast part oxidation occurs and thus the surface receives a special colouring. These so called tempering colours are characteristic for a desired tempering temperature.