ERW High Frequency Welded Pipe Mill for Carbon Steel Stainless Tube Product Specifications Attribute Value Product Name High Frequency Welded Pipe Mill Carbon Steel Automatic Stainless Tube Mills For Pipe Making Machine Max.Thickness for Square Pipe 0.8-3.0mm Worm Gearing Max.80m/min Certification CE ISO Pipe Diameter 21 - 63mm Material Carbon steel, stainless steel, low alloy steel Inner Diameter φ480~φ520mm Equipment Specification High frequency and precision Roller