Description ERW140 H.F. Straight Welded Pipe Production Line ERW140 high frequency longitudinal welded pipe production line / pipe making machine / tube mill is designed to produce welded pipes of 60mm-140mm in OD and 2.0mm-5.0mm in wall thickness, as well as corresponding square and rectangular pipe. Products: architectural structure tubes, low-pressure liquid tubes, coal transmission belt tubes, drive shaft tubes, guardrail tubes, tower footing tubes, automobile beam steel tube and other products. Equipment advantages ZTF forming process save roller up to 60% With direct square forming technology, one set of roller can produce all pipe sizes Electric control and automatic adjustment, high precision,high roller change speed