Stress corrosion cracking (SCC) of stainless steels and Ni-base alloys in chloride environments has been widely studied and the results to date suggest that SCC only occurs at potentials above a critical potential. Many researchers have demonstrated that this critical potential is the repassivation potential for localized corrosion of the material of interest. Corrosion resistant alloys (CRAs) have been widely used in the oil and gas production environments where low alloy steels typically have lower chance to withstand the corrosive conditions. It is highly likely that SCC of corrosion resistance alloys (CRA) only occurs above the repassivation potential of the material in H2S containing environment. This paper summarizes the work conducted to determine the repassivation potential of asuper duplex stainless steel (2507) and the efforts to demonstrate the correlation of the SCC susceptibility and the repassivation potential using different testing techniques including slow strain rate testing and fracture mechanics testing.