5 rows · Manufacturer of HR and CR ERW Pipes - ERW Tubes, Rectangular Pipe Sections, Rectangular Hollow High-Quality Mechanical Steel Tube ManufacturerERW Pipe (Electric Resistance Welded steel pipe and tube). A500 GR B carbon and alloy steel. Steel Tube Outside Diameters up to 3 OD. Steel Tube Lengths from 24 to 45. Adjustable Drum Sizes. Square & Rectangular or Round shapes. Ideal for light gauge structural and mechanical applications.