The stress corrosion cracking behaviour of three duplex stainless steels has been investigated in a number of chloride environments using both constant deflection (U-bend) and slow strain rate testing. Concentrated solutions of MgCl₂, CaCl₂ and LiCl yield variable ranking effects and should be avoided for general predictions of service performance, although they may make a valuable contribution to understanding of the fundamental processes governing stress corrosion cracking. Testing in NaCl gives consistent results indicating an increase in stress corrosion resistance with increasing alloying level. Two novel test methods, involving spray evaporation to simulate waterline or wet-dry conditions or a mixed chloride to simulate evaporated seawater are presented.