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Duplex stainless Steel (DSS) including grades duplex 2205(831803) and super duplex, they are commonly consist of 50% ferrite and50% austenite, and generally requires not less than 30%.Duplex stainless steel has good welding performance and high strength.Compared with austenitic stainless steel, it is about double yield strength of stainless steel 316,317 etc., it make the equipment lighterand stronger. Duplex stainless steel pipe has very good resistance to localized corrosion and stress corosion cracking. Duplex steel isnot intended to be used at temperatures above 300'C due to embrttlement, the continuous use temperature is from-50 to 250 -C.
2205, used in chemical processing, oil and gas processing equipment, marine and other high chloride environments,efuent scubbingsystems, pulp and paper industry, cargo tanks for ships and trucks, food processing equipment, biofuels plant.
2304,used in chloride containing environments, welded pipe systems, transportation, heat exchanger tubes, construction, pressurevessels, caustic solutions and the food industry.
2507, used in oil and gas industry equipment, offshore platforms, chemical process industries, desalination plants, mechanical andstructural components and power industry FGD systems.
Grade Available : UNS S31803, UNS S32205, UNS S31500, UNS S32304,UNS S32750, UNS S32760
ASTM A789(ASME SA789): Specification for Seamless and Welded FeriticlAustenitic Stainless Steel Tubing for General Sevice
ASTMA790 (ASME SA790):Specification for Seamless and Welded Ferritic/Austenitic Stainless steel Pipe
ASTMA928:Siandard Specification for FerfticlAustenitic(Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of FillerMetal