Duplex stainless steel is a high-strength stainless steel material with a duplex structure. Its main components are ferrite and austenite, so it has the advantages of ferrite and austenite. Ferrite has good strength and plasticity, while austenite has excellent corrosion resistance. Therefore, duplex stainless steel has both excellent strength and plasticity as well as excellent corrosion resistance.

Duplex stainless steel (DSS for short) refers to stainless steel with ferrite and austenite each accounting for about 50%. Generally, the content of the smaller phase needs to be at least 30%. In the case of low C content, the Cr content is 18%~28% and the Ni content is 3%~10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N.
This type of steel has the characteristics of both austenitic and ferritic stainless steel. Compared with ferrite, it has higher plasticity and toughness, no room temperature brittleness, significantly improved intergranular corrosion resistance and welding performance, at the same time, it also maintains the 475°C brittleness of ferritic stainless steel, high thermal conductivity, and superplasticity. Compared with austenitic stainless steel, it has high strength and significantly improved resistance to intergranular corrosion and chloride stress corrosion. Duplex stainless steel has excellent pitting corrosion resistance and is also a nickel-saving stainless steel.

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