1, Standard : ASTM B348, ASTM F67 , ASTM F136 , AMS 4928, 2, Material : Gr 1 , Gr 2 , Gr 3 , Gr 4 , Gr 5 , Gr 7 , Gr 9 , Gr 123, Diameter : 2 ~ 350 mm 4, Length : 6000 mm ( max )5, The tolerance we can do as h 6 ~ h 9 .6, Application : Chemical industry , aerospace , spaceflight , surgical...