Quality :Grade A Certificate:ISO9001:2000 Material: carbon stee ,stainless steel ,forged carbon steel ,alloy Product DescriptionOuter Diameter: 10mm-1200mm Wall Thickness: 0.5mm ... /T9711.1-1997, Material: ASTM A53, SS400, Q195-235, Q345(A, B, C), 16Mn, J55, K55, N80, L80, C90, C95, P110 ...