Round tubing are cylindrical shaped that are hollow. They have a wide variety of structural and architectural applications. Tubes are measured by their outside diameter and their wall thickness. Some examples of tube applications would be automotive parts, railings, patio furniture, support columns, guardrails, construction of bridges, storage systems, commercial and residential structures.

ERW or Electric Resistance Welded refers to a specific type of welding process known as seam welding. This type of welding is used to create round steel tubing. Steel strips are unwound from coils and trimmed to maintain the width and prepare the edges for welding. These strips then pass through contoured rollers which cold-form the material into a circular shape. The edges are forced together under pressure and then welded. After undergoing thorough testing the tube then passes through a series of sizing rolls to attain its precise size, after which the tube is then straightened and cut.

Hot rolling is a process, which involves rolling the steel at a high temperature, which is above its recrystallization temperature. At this temperature and in this state, it can be shaped and formed easily, leading to much larger sizes.

When hot rolled steel undergoes further processing, it is then known as cold rolled steel. The steel is cooled at room temperature followed by annealing and/or tempers rolling. This process will produce steel with closer dimensional tolerances and a wider range of surface finishes. The term Cold Rolled is erroneously used on all products, when in actuality the product name refers to flat rolled sheets and coil products. All cold products provide a superior surface finish, tolerance, concentricity, and straightness when compared to hot rolled.

When procuring Steelco’s ERW round hollow structural solutions know that:

  • The product is lightweight, durable, strong and cost effective
  • The surface of the product will have a superior finish
  • All products are designed to specifications; fulfilling your requirements exactly
  • The processes from manufacturing leading up to the finished product follows the strict quality control guidelines set by the industry


Size and Specifications MS Hot Rolled / Cold Rolled ERW Round Hollow Structural Steel Suppliers