... A53 Grade A&B Description: ERW Pipe Production Line/ERW Pipe Mill/ERW Pipe Making MachineExternal diameter: Max.Φ508mm(20inch) ... welder, internal and external burr removing unit, Polisher unit, Pipe (online) ultrasonic tester, IF annealing unit, Air coolant, ... Cut off unit.Finished euqipments: Hydrotester, High-efficiency End Beveller and conveyorsOptions: Marking unit, Flating test unit, Oiling unit ...