... Pipe Production Line/ERW Pipe Mill/ERW Pipe Making MachineExternal diameter: Max.Φ508mm(20inch)Steel grade: Max X80Steel material: ... 5L, API 5CTRange of external diameter: 42.16-508 mm (2inch-20inch)FF forming/roller row forming/FFX formingConsist of: ... miller, Plate (online) ultrasonic tester, FF/FFX/Roller row Foming machine, Squeeze roller unit, HF welder, internal and external burr removing unit ...