China circular hollow section tube

Seamless pipe and welded pipe are two common type of hollow structural section in use. An Englishman, named Whitehouse, developed the fire welding of circular hollow sections. And the production of welded circular hollow sections became more important after the development of the continuous welding process in 1930 by an American, named Fretz Moon. Nowadays, welded hollow sections with a longitudinal weld are mainly made employing either electrical resistance welding processes or induction welding processes. Hollow sections, especially CHS, have the most effective cross section for resisting torsional moments, because the material is uniformly distributed about the polar axis.

Round steel pipe is one common type of hollow section tubes in the current steel pipe market, which is generally made by rolling plates to the required shape in a mill. And the longitudinal weld is made by a submerged arc welding process. Besides, another process for large tubes is to use a continuous wide strip, which is fed into a forming machine at an angle to form a spirally formed circular cylinder. And then the edges of the strip are welded together by a submerged arc welding process to produce a spiral steel tube. Besides the ordinary types of hollow section tubes, such as circular, square and rectangular steel pipe, some other shapes are also available for certain applications in life. Today, China hollow section tubes also offer advantages of corrosion protection in applications. Some hollow sections have rounded corners resulting in a better protection than that with sharp corners. This is especially true for the joints in circular hollow sections where there is a smooth transition from one section to another. Meanwhile, this better protection increases the protection period of coatings against corrosion.

In the modern times, China hollow section tubes are widely used for numerous construction projects, from the structures being built to the actual tools needed to complete the jobs. Specifically, round steel pipe and square steel pipe are often seen as one of important building materials in the construction trade. When it comes to construction projects, hollow section tubes are used in many building types from small storage units to skyscrapers in big cities. For example, they are used to create the foundation of large buildings as well as other framework. China hollow section tubes are also used to construct balconies along with railing for staircases. As for their function with tools used for such projects, hollow section tubes can be seen in the scaffolding workers rely on to reach tall points of buildings.