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Duplex steel/super duplex steel stainless steel pipe has a dual-phase structure of austenite + ferrite, so its performance characteristics have the characteristics of austenitic stainless steel and ferritic stainless steel. It is a type of stainless steel with high strength and high corrosion resistance. Usually, when the carbon C content is low, 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. Compared with ferrite, it has higher plasticity and toughness, no room temperature brittleness, and 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, the yield strength is significantly improved, and the resistance to intergranular corrosion, stress corrosion, corrosion fatigue and abrasion is significantly improved. Commonly used grades S31803/S32205, S31500, S32304, S32750, S32760, Commonly used standards ASTM A789 (ASME SA789) Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe for General Purposes ASTM A790 (ASME SA790) Seamless and welded ferritic/austenitic stainless steel nominal pipes GB/T 21833-2008 Austenitic-ferritic duplex stainless steel seamless steel pipe If you have any in need of duplex pipes, talk with HUA STEEL co.,