Hollow square tubes are lightweight thin-walled steel tubes with a hollow square cross-section, also known as cold-formed steel sections. They are made by cold bending steel strips or coils, typically of Q235 hot-rolled or cold-rolled steel, into square cross-section shapes after cold bending processing, and then high-frequency welding them into the final size. In addition to the increased wall thickness, hot-rolled extra-thick-walled square tubes also have corner dimensions and edge straightness that meet or exceed those of resistance-welded cold-formed square tubes. Square tubes are categorized by their applications, such as structural, decorative, construction, mechanical, and more.

When selecting square tubes, it's typically important to consider three aspects: size, load-bearing capacity, and usage environment.
1. In terms of dimensions, the specifications of the square tube to be used should be determined based on the actual situation; choose the model according to the required size of the square tube. The models of square tubes are defined by their dimensions. For example, the square tube with a 30*30*1.3 model has side lengths of 30mm and a thickness of 1.3mm.
When selecting square tubes, pay attention to the bearing capacity issue. Square tubes of different specifications have different bearing capacities, and you should choose different specifications based on the construction situation.
3. When selecting square tubes, it's important to consider the usage environment. Decide whether to apply corrosion protection to the square tube based on the different environments. If the environment is highly corrosive, we recommend choosing galvanized square tubes. The galvanized layer of galvanized square tubes provides excellent rust and corrosion resistance.