carbon steel tube 1)standards:GB ASTM JIS DIN and so on 2)Grade:10#, 20# 25# 45# Q235 ... -WP11. A234-WP5Our Products:Seamless steel pipe, ERW steel pipeMaterials:Carbon steel, stainless steel.Standard:ASTM, ANSI, API, JS, DIN, GB, BSSize:From size: 1 ... /2"to 88", SCH40, SCH80, SCH160, or per customers' drawings or samples seamless carbon steel tube