Duplex Pipe

Duplex Pipe/DuplexTube/Super Duplex Pipe/Stainless Duplex Pipe Standards: ASTM/ASME A789/SA789, A790/SA790,A450,A530 Material: UNS S31803(Cr22Ni5Mo3)/2205,UNS S32750,UNS S31500(Cr18NiMo3Si2) Chemical Composition Grade C max Si max Mn max P max S max Cr Ni Mo N UNS S32750 0.030 0.8 1.2 0.030 0.015 24.0-26.0 6.0-8.0 3.0-5.0 0.24-0.32 UNS S31803 0.030 1.0 2.0 0.020 0.020 21.0-23.0 4.5-6.5 2.5-3.5 0.08-0.20 UNS S31500 0.030 1.0 1.2-2.0 0.030 0.030 18.0-19.0 4.5-5.5 2.5-3.5 0.05-0.10 Physical Properties Grade Y.S.MPa min T.S.Mpa min Elongation % Hardness HRC UNS S32750 550 800 15 20 UNS S31803 450 620 25 20 UNS S31500 440 630 30 20 Stainless steel duplexpipes are with high mechanical strength, good elongation and weld ability which needs no pre-heating before welding and heat treatment after welding, low thermal expansion, excellent resistance to stress corrosion cracking, pitting and crevice corrosion, and high resistance to general corrosion in different environments. Duplex stainless steel tubes and pipes are applied to heat exchangers in refinery industries, petrochemical plants, paper and pulp industries, sugar and beverage industries.