... .28, ASTM A53/A106, API 5L, ASME B36.10M---1996, DIN2605 / 2615 / 2616, JIS P2311/23123. Size: 1/2"-72"4. Wall Thickness ... : SCH20,STD,SCH40,SCH80,SCH160,XXS5. Material: ASTM A234 WPB, ST35.8, ST37, WP11 ... , 20#, Q2356. Surface treatment: black painting,Anti-rust varnish oil,hot galvanizing or as customer's special requirement 1/2 ...