... /t 4)Certificates:ISO 9001;2008 5)Length:2-12m Carbon Steel Pipe O.D19.7—630 mmW.T0.7-35 mmO ... , API 5L, API 5CT, CE, etc.Surface TreatmentsBlack Vanished, PP,PE,3PE,Galvanized etc.UsageConstruction, water heating, car manufacturing, electrical installation ...