321)Standard: ASTM A312/ASME SA312 2)Material: TP304,TP304L,TP316L,TP321,TP310S,TP317L 3)Size: OD 18~ ... Steel Seamless Round Pipe 1)Standard: ASTM A312/ASME SA3122)Material: TP304,TP304L,TP316L,TP321,TP310S,TP317L3)Size: 1/2" ~ 20 ... product are export Southeast Asia, Mid East, Africa, Eastern Asia, Western Europe and So on. TP317L Stainless Steel Seamless Round Pipe