Erw Steel Pipes And Seamless Steel Pipe

There are a few aspects of differences between ERW steel pipes and seamless steel pipes. ERW pipes are used in the transportation of liquid, such as fuel, gas and so on, regardless of its pressure, which make it one of the most typical conveying tubes all over the world. Seamless pipes are, on the other hand, a kind of steel pipe in the shape of square or rectangle having no seam around with hollow cross-sections, which is used in conveying liquid as well as making structural and machine parts, thanks to its high anti-bending and anti-torque strength and unbelievable lightness. In general, ERW and seamless steel pipes are quite different in use.

The biggest difference between ERW pipe and seamless steel pipe is that ERW pipe has welding line, which is the same as welded steel pipe, but seamless black steel pipe doesn’t have, either does the welded steel pipe. Furthermore, the welding line of ERW pipe is the key to the quality of ERW steel pipe. The more unrecognizable the welding line of ERW pipe is, the higher quality ERW pipe has.

There are two ways to eliminate the welding line: geometric seamlessly and physical seamlessly. Geometric seamlessly is to eliminate the burr both inside and outside while physical seamlessly is to take steps to make base metal and metallographic structure uniform and consistent, which seems more complicate to achieve, however, a ERW pipe without a welding line can be successfully attained through which.

Compared with processing technique of ERW pipe, the processing technique of seamless steel pipe is much simpler. There are two entirely different types of processing technique: cold-drawing and hot rolling. Compared with hot rolling, the technological process of cold-drawing is more complicated. Moreover, in the appearance, cold-drawn seamless stainless-steel pipe is shorter than hot-rolled one and the wall thickness of cold-drawn seamless stainless-steel pipe is generally smaller than the wall thickness of hot-rolled one. What’s more, the technological process of hot rolling needs high temperature which reduces the resistance of deformation so that a big deflection is achieved. Generally speaking, the technological processing of ERW pipe and seamless steel pipe are quite different, due to the different appearance.

In general, although ERW pipe and seamless steel pipe both play an important role as the welded steel pipe does in the construction of society, ERW pipe and seamless pipe has different use and different making progress thanks to their different appearance

To identify if a pipe is ERW or seamless, simply read the stencil on the side of the pipe. If it is ASTM A53, Type S means seamless; Type F is furnace but welded; Type E is Electrical resist welded. It is the easiest way to identify whether a pipe is ERW or seamless.

In short, seamless pipes are marketed on an outdated myth that it does not have flaws but that welded has an inherent flaw throughout the length of each tube, as stated above. Intuitively this concept is easily accepted by purchasers and designers with limited experience with the various products. Each product form and manufacturing method has its own inherent problems and potential defects.

Consumers must become familiar with what those problems and defects are, and how they might affect particular applications. Then they can make an informed decision based on facts, rather than myth.