They are used for die casting, continues casting and die forging. When using them at temperatures of more than 200 °C and also at changing thermal loads the structure needs to be stable that warm ductility, high temperature strengths and wear-resistance will not be negatively affected. Due to the fact that not all required characteristics are realizable in one kind of steel the selection needs to be effected according to the use of the tools. Herewith the chemical composition shows two alloy groups: WCrV steels and CrMoV steels.