Square tube is a type of steel tube with equal side lengths, which is formed by rolling strip steel through a process. Typically, strip steel is unpacked, leveled, curled, and welded into a round tube, which is then rolled into a square shape and cut to the required length. Square tube is a lightweight, thin-walled hollow square steel tube, also known as cold-formed steel, and it is a shaped steel with a square cross-section shape and size. It is made by cold bending processed steel strip or coil with a yield strength of Q235, either hot-rolled or cold-rolled, into the desired shape and then high-frequency welded.

A square tube is a lightweight, thin-walled steel tube with a hollow square cross-section, also known as cold-formed steel section. It is a type of steel with a square cross-section shape and size, made by cold bending steel strip or coil, which is hot-rolled or cold-rolled, into the desired shape. In addition to the increased wall thickness, hot-rolled thick-walled square tubes also have corner dimensions and edge straightness that meet or exceed those of resistance-welded cold-formed square tubes. They possess excellent comprehensive mechanical properties, good weldability, cold and hot working performance, and corrosion resistance, with good low-temperature toughness.