It is a steel material that is open at both ends and has a hollow concentric circle section, and its length is larger than that of the periphery. The specifications of steel pipes are expressed by external dimensions ( such as outer diameter or side length ) , inner diameter and wall thickness. The size range is very wide, from capillary tubes with small diameters to large round steel pipes with a diameter of several meters. Round steel pipes can be used for pipelines, thermal equipment, machinery industry, petroleum geological drilling, containers, chemical industry and special purposes.
https://www.xhychromerod.com