high frequency welding machine for round tube, retangular. 20x20 50x50 60x60 80x80 High Frequency welded steel tube making machine tube making machine; tube machine; steel tube machine1. General introduction KJ Series Straight Seam High Frequency Steel Welded pipe mill lines are used to manufacture welded steel pipes of diameter range from Φ7mm-Φ365mm, wall thickness range 0.2mm-10.0mm. They are ...
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