Carbon seamless& welded pipe O.D : 1/ 8â ---40â 1/ 8â â 8â ( cold drawn) , 8â â 16â ( hot rolled) 16â ---40â ( hot expanding) Thickness: 1mm-45mm Standard: ASTM, JIS, DIN, EN, BS, ISO, GB, API. Certificate: LR, GL, ABS , DNV, BV , KR, NK, CCS