Duplex Tube

duplex tube 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/SA790 Steel Grade: UNS S32750, S31803, S31500 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 4.50-6.50 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 0.05-0.1Physical 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 20For sizesplease check with our office for further confirmation. Marking: JW, material grade, standard, specification, heat no. Length: unbending length or fix length Package: knitting strip bundle, wooden box or steel box Mill test certificate: according to EN 10204 3.1B Value added service: Third party inspection Bright annealed, polished outside and inside surface