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Product Description: Duplex stainless steel tubes & pipes 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 & pipes are applied to heat exchangers in refinery industries, petrochemical plants, paper & pulp industries, sugar & beverage industries.Standards: ASTM/ASME A789/SA789, A790/SA790Grade: UNS S32750, S31803, S31500Chemical Composition GradeC maxSi maxMn maxP 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 4.50-6.50 2.50-3.50 0.08-0.20 UNS S31500 0.030 1.0 1.2-2.0 0.030 0.030 18.0-19.0 4.50-5.50 2.50-3.50 0.05-0.1 Physical Properties Grade Y.S.MPa min T.S.Mpa min Elongation % Hardnes