Heat treatable steel

Heat treatable steels are used for components which must withstand high mechanical stress. Heat treatable steels are frequently alloyed in order to assure reliable martensitic transformation during tempering. In the tempering process, the dimensions and geometry of the components play a crucial part in the heat dissipation. Large components with less favourable geometries require the alloy content of the heat treatable steel to be correspondingly higher. The higher the alloy content of the steel, the lower the quenching rate of the hardening agent (water, oil, polymer or, in extreme cases, gas) needs to be selected.

Generally speaking, deformation decreases with decreasing quenching rate. Subsequent tempering at varying temperatures enables selective configuration of strength and ductility values. As a general rule of thumb we can say that with increasing tensile strength, fatigue strength also increases.


DIN-No. Designation
1.0402 C22
1.0503 C45
1.7231 G42CrMo4
The above is merely a selection of typical investment casting materials, further options on request.