Round pipes are cylindrical steel tubes created through an electric resistance welding process. The manufacturing process involves forming a flat steel strip into a cylindrical shape and then welding the edges together using electric resistance. This is achieved by passing a high-frequency electric current through the edges of the strip, which causes the material to heat up and weld together. The process is characterized by its efficiency and ability to produce pipes with a uniform wall thickness and precise dimensions.

Round pipes are typically made from carbon steel, but they can also be produced from other types of steel alloys depending on the application requirements. The material used for ERW pipes is usually subjected to quality control to ensure it meets specific standards and specifications. Common standards for ERW pipes include ASTM (American Society for Testing and Materials) and API (American Petroleum Institute) specifications.