Carbon Elbow Material:Carbon steel WT:SCH40, STD, SCH80, XS, SCH160, XXS ProductnameCarbon steel elbowStandardASME B 16.9, DIN, JIS, GB 12459/13401MaterialA234 WPB, A420 WPL6, Q235, 20GSize1/2" ~ 24"WTSCH40, STD, SCH80, XS, SCH160, XXSRadius of curvature1D-10DConnectionButt-welding,seamlessEndBevel, Plain, ThreadSurface1) Sandblasting2) Paint black lacquer or transparent oil on surface to prevent ...