The difference between seamless and ERW stainless steel rectangular section pipes


In the stainless steel rectangular section pipe, a solid round steel ‘billet’ is heated and formed into a hollow tube by pushing or pulling it over a form. Billets are procured both from domestic and foreign suppliers. Steel round billets originate from renowned mills in Europe, the Far East countries, Canada, and China. Major indigenous suppliers include JSPL, JSW Kalyani.

HR Coils are necessary for the manufacture of ERW stainless steel pipes. SAIL, Essar, JSW, and Lloyds, among others, are major indigenous suppliers of HR Coils.

Why is seamless stainless steel pipe different from ERW stainless steel pipe?

The process of ERW pipe manufacturing involves rolling metal and then welding it longitudinally along its length. The seamless pipe is manufactured by extruding metal to the desired length; therefore, the ERW pipe has a welded joint throughout its cross-section, whereas the seamless pipe has no joints throughout its cross-section.

Seamless pipes have no joints or welding and consist of solid billets. Seamless pipe sizes range from 1/8 inch OD to 26 inches OD, depending on the dimensional and wall thickness specifications. It is suitable for applications that require high pressure, including hydrocarbon industries, refineries, oil exploration and drilling, oil transportation, bearings, boilers, and automobiles, among others.

In ERW (Electric Resistance Welded) pipes, the longitudinal weld occurs using strips or coils, and the outside diameter can be up to 24″. The ERW pipe is formed from a ribbon of steel pulled through rollers and shaped into a tube by fusing it through an electrical charge. Most of its applications involve low/medium pressure, such as the transportation of water/oil. Our company is a leading manufacturer and exporter of ERW stainless steel pipes from India. Contact us for more information.

The most common sizes for ERW rectangle stainless steel Pipe are 2 3/8 inch OD to 24 inch OD, in lengths up to 100 feet. Surface finishes are available in both bare and coated formats, and on-site processing is available.

Seamless and ERW pipes use what technologies?

Technology for Seamless Rectangular Stainless Steel Pipes and ERW Pipe Production “CPE Technology” used for Seamless Pipes and Tubes Production up to 7″ OD is a world-renowned Technology. In the segment of seamless pipes and tubes with larger diameters, “PLUG MILL” has the best reliability. The high-frequency induction welding process produces ERW pipes and tubes up to 21 inches outside diameter.

Identifying seamless vs. ERW stainless steel pipes

Simply read the stencil on the side of the pipe to determine whether it is seamless or ERW

  • The ASTM A53 Type S refers to seamless materials.
  • In Type F, welding takes place in a furnace,
  • Type E of welding is electrical resist welding.

It’s as simple as that. Identifying seamless or ERW pipe is the easiest task.

It claims that seamless tubes do not have flaws, but welded tubes do. Buyers and designers with limited experience intuitively accept the concept. Products and manufacturing methods have inherent problems and defects.

Consumers need to learn about these problems and defects and how they may affect specific applications. Facts rather than myths will help them make informed decisions.

ERW stainless steel pipes are manufactured and exported by Sigma Pipes from India. A variety of dimensions and shapes are available for ERW steel pipes as one of the largest Rectangular Steel Pipeexporters from India. The SS pipes that we manufacture consist of the highest quality raw materials that are ISO and OHSAS-certified. The stainless steel manufacturing unit can produce large and customized orders from around the world. For more information about our ERW stainless steel pipes, please contact us via email. Exporter of stainless steel pipes from India.

Source:- http://sigmapipes.com/the-difference-between-seamless-and-erw-stainless-steel-rectangular-section-pipes/