Commonly used brands
S31803/S32205, S31500, S32304, S32750, S32760,
Commonly used standards
ASTM A789 (ASME SA789) General Purpose Seamless and Welded Ferritic/Austenitic Stainless Steel Pipes
ASTM A790 (ASME SA790) Seamless and Welded Ferritic/Austenitic Stainless Steel Tubes
GB/T 21833-2008 Austenitic-ferritic duplex stainless steel seamless pipe
Dual-phase steel / super duplex stainless steel pipe is austenitic + ferrite dual phase structure, so its characteristics are characterized by austenitic stainless steel and ferritic stainless steel, is a type of high strength and corrosion resistance The best stainless steel. In general, when the carbon-containing C content is low, the Cr content is 18% to 28%, and the Ni content is 3% to 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 brittleness at room temperature, significantly improved resistance to intergranular corrosion and welding performance. At the same time, it retains the brittleness and high thermal conductivity of ferritic stainless steel at 475°C, and has superplasticity, etc. Features. Compared with austenitic stainless steels, the yield strength is significantly improved, and resistance to intergranular corrosion, stress corrosion, corrosion fatigue, and abrasion are significantly improved.