... .Dup Astm A790 Duplex Seamless Stainless Steel ... ASTM,DIN,JIS,GB,GOST,ENGRADE :201,301,304/TP304/304L,321/F321,TP316L/316L,317L, 347H, 310S , Duplex S31803, etc.-------------------------------------------------------------------------------------SPECIFICATION ... BY TRAIN)------------------------------------------------------------------------------------- Astm A790 Duplex Seamless Stainless Steel Tube/ ...