Damage and fail of material through Stress Corrosion Cracking (SCC) are increasing in importance in modern high strengh austenitic steels in many fields. Despite a wide range of literature, the standard of knowledge about the mechanisms and influencing factors is still insufficient. An estimation of the resistance towards stress corrosion cracking or an explanation of the behaviour of these steels is not yet possible in many cases. The researches in this paper are restricted to two nickel stabilizing austenites of Böhler qualities: A220 and A975. Using a Slow-Stainrate (SSRT) and a Constant-Load-Testing-System (CLT), in the frame of this degree dissertation, the basic data for the CrNiMo-steels for the evaluation of the resistance of the chosen steels against stress corrosion cracking in media containing chloride (45wt.-% MgCl2 and 36,5wt.% MgCl2 at a temperature of 123° C) shall be ascertained. Part of this are the mechanical traits at the temperature used in the experiment, ascertained in glycerine and under SSRT-circumstances. Additionally, electrochemical tests will take place in both corrosive media in order to acquire information about the resting potential, repassivation potential and the passive current density.