carbon steel tube 1)standards:GB ASTM JIS DIN and so on ... 20# 25# 45# Q235 Q345 16Mn 15CrMo and so on carbon steel pipe (BE) Size"1/2"-48" Material:A234-WPB. ... A234-WP12. A234-WP11. A234-WP5Our Products:Seamless steel pipe, ERW steel pipeMaterials:Carbon steel, stainless steel.Standard:ASTM, ANSI, API, JS, DIN, GB, ... SCH40, SCH80, SCH160, or per customers' drawings or samples seamless carbon steel tube