Many applications come down to a decision of whether to use ERW tubes, LSAW, or HSAW. There are significant differences with the options, including the characteristics and costs. So, it is vital to think carefully about what to choose. We want to have a closer look here to compare the tensile and yield strength they offer. These are among the most important factors because they influence performance and safety.
LSAW
Let’s start with longitudinal submerged arc welded pipe. It’s a really interesting product, beginning life as a sheet of steel. Manufacturers form it into tubing using two different presses; U and O. A weld joins the two edges of the material together, using a relevant filler material, creating a seam along the length of the pipe. There are then final processes like mechanical expansion, inspection, testing, and end finishing.
The significant thing here is the use of plate and welding technique. Crucially, it is important to choose the right filler. It must match the base material as closely as possible, avoiding overmatching. It will ensure more uniformity in the tensile strength. Quality LSAW pipe is strong and tough, therefore it is a good choice for applications where the internal pressure is high.
ERW
Modern ERW tubes are really high quality, far better because of the development of high frequency welding techniques. They begin as steel coil or strips, before rolling turns them into a tube shape. Then, the edges are welded together without using any filler.
The crucial thing to keep in mind here is the tensile strength of ERW tube is generally close to that of the base material. A small weld zone and not using filler in the welds provides more uniformity. Generally, the tubing is best for low and medium pressure applications.
HSAW
Finally, we have helical submerged arc welded pipe. Like ERW, it begins as steel coil. However, creating the tubing is more complex. Coils are adapted into a spiral before welding bonds the edges. Like LSAW, it requires the use of weld filler.
The key factor here is HSAW pipe has two overlapping welds, inner and outer. It has a massive impact on the quality, toughness, and rigidity. Ultimately, you have strong, larger diameter pipes with higher tensile and yield strength. That makes them a great choice for high pressure applications. However, it is vital to keep weld orientation and loading direction in mind.
Do you need ERW tubes for a project?
Ordering great tubing is easy with Union Steel Tubes. We’ve got a big range, including various shapes, sizes, and diameters. We have products for an ever-growing list of applications. Additionally, we can provide galvanisation, chrome plating, and other options to finish tube.
So, if you want ERW tubes, please contact us. We’re happy to provide details, including advising about properties like tensile and yield strength. That way, you can ensure you have the right product for any application.
