Duplex stainless steel tube

Duplex Stainless Steels have a structure that contains both ferrite and austenite. Duplex alloys have higher strength and better stress corrosion cracking resistance than most austenitic alloys and greater toughness than ferritic alloys, especially at low temperatures. The corrosion resistance of duplex alloys depends primarily on their composition, especially the amount of chromium, molybdenum, and nitrogen they contain. Duplex alloys are often divided into three sub-classes: Lean Duplex, Standard Duplex, and Superduplex.

GB/T 21832; GB/T 21833; ASTM A789(ASME SA789); ASTM A790 (ASME SA790); ASTM A928; EN10216-5; DIN 17456; DIN 17458; JIS G3459; G3463; GOST 9940; GOST 9941. 

UNS S32001, S31500, S32304, S31803 S32205, S32760, S32750