The high pressure die casting process is one of the most important processes for producing high quality castings. Hot work steels, which sufficiently fulfil the requirements that arise in the high pressure die casting process, are used as materials for mould making. Hot work steels must therefore be able to display qualities such as tempering consistency, structural consistency at increased temperatures, a high degree of hot ductility, a high degree of hot wear resistance, high thermal shock resistance as well as resistance to reaction with the material to be processed. This work will examine, in light of chemical corrosion, various cylindrical hot work steel samples, in both nitrated and denitrated states, each in two different liquid aluminium melts. The results obtained through the immersion trials serve to deliver insight into the dissolving and adhesive properties ("die soldering") of the tool steels available. Die soldering is to be understood as the formation of intermetallic phases on the surface of the die cast mould, to which the liquid aluminium alloy could adhere during solidification, in practice therefore completely fusing the casting with the mould. The trials were conducted using light microscope and EDX analyses.