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Duplex Stainless Steel Pipes ASTM A789 / ASTM A790 / ASTM A928 S31803, S32750, S32760, 1.4462, 1.4410, 1.4501,6M Standards: ASTM/ASME A789/SA789, A790/SA790, A928,A450,A530 Material: UNS S31803...