Duplex stainless steel has the following performance characteristics:(1) Molybdenum-containing duplex stainless steel has good resistance to chloride stress corrosion under low stress. Generally, 18-8 type austenitic stainless steel is prone to stress corrosion cracking in neutral chloride solution above 60 °C, and heat exchangers, evaporators, etc. made of such stainless steel in industrial medium of trace chloride and hydrogen sulfide. There is a tendency to produce stress corrosion cracking, while duplex stainless steel has good resistance. (2) Molybdenum-containing duplex stainless steel has good pitting resistance. The duplex pitting potential of the duplex stainless steel is similar to that of the austenitic stainless steel when it has the same pitting resistance equivalent value (PRE=Cr%+3.3Mo%+16N%). The pitting corrosion resistance of duplex stainless steel and austenitic stainless steel is comparable to that of AISI 316L. The pitting and crevice corrosion resistance of 25% Cr-containing, especially nitrogen-containing, high-chromium duplex stainless steels exceeds that of AISI 316L. (3) It has good corrosion fatigue and wear corrosion resistance. It is suitable for mak...