... /t 4)Certificates:ISO 9001;2008 5)Length:2-12m ASTM Black Steel PipeO.D19—630 mmW.T0.6-35 mmO.D ... Tolerance±5%Length6m in normal; also according to customers’ requirementsStandardBS, ASTM, EN, API 5L, API 5CT, DIN, GB/T, etc. ... TechniqueweldedProduct CategoryMetallurgy, Mineral & EnergyMaterialQ195/Q215/Q235/Q345/A53(A.B)CertificatesISO, API 5L, API 5CT, CE, etc.Surface ...