Talking about the difference of bearing capacity of several spiral welded steel tubes

The bearing capacity of spiral welded steel pipe is related to two points. One point is the mechanical properties of steel, which is related to the commonly stated yield point, tensile strength, elongation and impact toughness. The other point is related to the geometrical characteristics of its section. Generally, a circular spiral welded steel pipe has the strongest resistance to local buckling, and thus it is the best member to withstand radial internal pressure and radial external pressure.

Under the same steel number, equal area and the same supporting conditions, the rectangular slanted steel pipe has strong eccentric compression bearing capacity, and the circular and square steel tubes have the strongest compressive bearing capacity, but the square and rectangular straight seam steel pipes are subject to the ability of the nip to resist local buckling is not as good as that of a circular steel tube. Compared with spiral welded steel pipe, the seamless steel pipe has complicated production process, high quality and high price, and is less used in engineering. The latter is applied more.

At present, the straight seam steel pipe made of steel can combine the advantages of the two, so that the straight seam steel pipe can be laterally compressed, and the compressive strength can be doubled, and at the same time, due to the existence of straight seam steel pipe The rigidity of the steel pipe is improved, and the two work together, thereby greatly improving the bearing capacity.