... ,ASTM A53 Grade A&B Description: ERW Pipe Production Line/ERW Pipe Mill/ERW Pipe Making MachineExternal diameter: Max.Φ508mm(20inch) Steel ... welder, internal and external burr removing unit, Polisher unit, Pipe (online) ultrasonic tester, IF annealing unit, Air coolant, ... unit, Weighing and measuring unit, Packing unit, off line ultrasonic unitCut off: Swing cutoff or milling cutoffHigh Frequency ...