ASTMA790 UNS S31803 Duplex Stainless Steel Pipes Standard: ASTM A789, ASTM A790 Material: S31500, S32101, S32003, S32304, S31803, S32205, S32750, S32760 Size: O.D.: 12MM-426MM, W.T.: 0.8MM-30MM ShangHai ShengQiu , we carry a full inventory of ASTMA789/ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipe and Supply ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipe their microstructures consist of a mixture of austenite and ferrite phases. As a result, duplex stainless steels display properties characteristic of both austenitic and ferritic stainless steels. We Supply DuplexStainless Steel Pipes and Tubes in Specification ASME SA / ASTM A789 , A790, A928 and Grades UNS S32205 , UNSS31803 , UNS S32750 , UNS S32760 , UNS S31500 , UNS S32101 , UNS S32003 , UNS S32304 etc. The grade indicates the testing methods required for a given application. ...