ERW/ GI/ MS Carbon Steel Square Tube Mill Line Pipe Making Machine Product Specifications Attribute Value Product name High Frequency Welded Pipe Mill Steel ERW Pipe Mill / Tube Mill Production Line For Square Pipe Production Running speed Max. 80m/min Adjusting Worm gearing Pipe Diameter 21 - 63mm Max. Thickness for Square Pipe 0.8-3.0mm Welding Type High Frequency Welding Product Description This High Frequency ERW Carbon Steel Pipe Mill is designed for precise fabrication