... ASTM A53 Grade A&B Description: ERW Pipe Production Line/ERW Pipe Mill/ERW Pipe Making MachineExternal diameter: Max.Φ508mm(20inch) ... forming/FFX formingConsist of: Coiler car, Decoiler, Peeler and straightener, Pinch and leveling Machine, End shear machine, Accumulator ( ... welder, internal and external burr removing unit, Polisher unit, Pipe (online) ultrasonic tester, IF annealing unit, Air coolant, ...