Within a number of different industries and project needs, steel tube is a valuable material. Created through several different formats that bring different sets of properties, steel tube is widely used in various construction and engineering fields due to its ease of assembly and high strength.
At Wasatch Steel, we’ll provide you with a wide range of steel tube options at your convenience. We can also help you understand some of the varying manufacturing processes that are behind steel tubing, plus what they say about its properties. Here are three of the most common manufacturing or finishing processes you’ll find in this realm.
Abbreviated ERW, this is a format that signals a specific welding process – actually two processes, spot and seam welding. This process involves several specific steps where the steel is unwound and trimmed, then passed through rollers to cold-form the steel into the proper shape (circular, square or rectangular).
From here, the edges are forced together into a butt joint, then welded at a very high temperature to form a flash weld. Once the weld is tested, the tube passes through various sizing rolls to achieve the proper size, and then the length is cut. The materials used here will generally be available in both hot-rolled and cold-rolled formats.
When dealing with seamless mechanical tubing – the type that, as the name suggests, comes with no welded seams – the term to remember is “extrusion.” This is a process where steel bar is pierced in the middle using a die, turning what was previously a solid round bar into a round tube instead. There are two types of seamless tube to consider:
Abbreviated DOM, this isn’t actually a steel tube type or manufacturing format – it describes the finishing process often used. Many of the early parts of the process are identical to ERW format, with differences showing up in the finishing stages when the flash weld is removed. In these cases, the tube will be cold drawn over a mandrel, bringing excellent dimensional tolerance and surface finish. Another major benefit of DOM materials is that they boast the strongest weld strength you can find. DOM products do have a seam, despite them sometimes mistakenly being labeled as seamless tube.
For more on the various processes and finishing formats used on steel tube, or to learn about our steel pipe, bar or any of our other steel services, contact the pros at Wasatch Steel today.