The constructed steels with steel tubes take advantage of the excellent properties the tubular profiles to resist the compressive stress, torsion and flexion in all the directions. With respect to the resistance and stability, the tubular sections present/display superiority with respect to other families of steel sections. Especially, the hollow closed sections circular have the most effective section before the torsion efforts, when having distributed all their material around the polar axis. The module of torsion of the profiles of tubular section is 200 to 300 times greater than the one of the profiles of open section. Already for a long time, the bamboo branches, by their tubular structure, were turned into light construction equipments that took advantage all these advantages. In century XIX, along with the development of the industry of the steel, the first methods arose from manufacture of pipes with hollow circular sections at the same time as the manufacture of the classic laminated open sections was developed in the heat of the moment (profiles in I, L and U).

The tubes of circular section make from a solid steel block, in case the resulting tubes are not welded. In the case of welded circular tubes, the pipe makes or from a flat billet. The process of manufacture of the circular steel tubes is practically the same in the case of use like conduction of fluid or structural element. Nevertheless, & was the Stewart; Lloyds, in the United Kingdom in 1952, the pioneer in the industrial production of profiles of rectangular hollow section. The tubes of squared, rectangular, hexagonal or octagonal section, are obtained from the deformation, as much in the heat of the moment as in cold, of a circular tube like piece to conform. For it, the tube is made happen through conformation cylinders that work in series providing to the original tube the required form. In the selection of a profile in particular in a steel aspects like advantages depend and the disadvantages with respect to the mechanical properties, unit costs of the material and costs of manufacture, assembly and maintenance.