What are the classification of straight seam steel pipes?

  Straight seam steel pipes are mainly used for fluid medium and petroleum and natural gas transmission pipelines, and their specifications are expressed by outer diameter + wall thickness. Straight seam steel pipe has single-sided welding and double-sided welding, and the welding process is divided into high-frequency resistance welded steel pipe and double-sided submerged arc welded steel pipe. High frequency resistance welding is an induction welding (or pressure contact welding), which does not require weld filler, no welding spatter, narrow welding heat affected zone, beautiful welding molding, good welding mechanical properties, etc. Therefore, in the production of steel pipes It is widely used. The process of double-sided submerged arc welding can realize welding in the best position, and it is not easy to appear defects such as wrong edges, welding deviation and under-welding, and it is easy to control the welding quality. Online quality inspections of steel pipes ensure that the entire process of steel pipe production is under effective detection and monitoring, effectively guaranteeing product quality.

  Straight seam welded pipe shall ensure that its hydrostatic test, the tensile strength and cold bending performance of the welded seam meet the requirements. Straight seam welded steel pipe has the characteristics of relatively simple process and rapid continuous production. It is widely used in civil construction, petrochemical, light industry, water supply, heating, steel structure modeling and other departments. It is mostly used to transport low-pressure fluid or make various engineering components and light industrial products.