... , API 5CT ,ASTM A53 Grade A&B Description: ERW Pipe Production Line/ERW Pipe Mill/ERW Pipe Making MachineExternal diameter: Max.Φ508mm(20inch) Steel grade: ... welder, internal and external burr removing unit, Polisher unit, Pipe (online) ultrasonic tester, IF annealing unit, Air coolant, ... adopts PLC controller, meet with DIN, JIS and GBERW Pipe Mill type (Only for reference, can be desiged according ...