Duplex stainless steel has the characteristics of austenitic stainless steel and ferritic stainless steel because of its austenite + ferrite duplex structure and the content of the two phase structures is basically the same. The yield strength can reach 400Mpa ~ 550MPa, which is twice that of ordinary austenitic stainless steel. Compared with ferritic stainless steel, duplex stainless steel has high toughness, low brittle transition temperature, and significantly improved intergranular corrosion resistance and welding performance. 

At the same time, it retains some of the characteristics of ferritic stainless steel, such as brittleness and heat at 475°C. High conductivity, low linear expansion coefficient, superplasticity and magnetism. Compared with austenitic stainless steel, duplex stainless steel has higher strength, especially its yield strength is significantly improved, and its pitting corrosion resistance, stress corrosion resistance, corrosion fatigue resistance and other properties are also significantly improved.