It is possible to use iron round pipes as columns, and it can also be welded with angle steel, but the effect of square steel will be better.

It is better to use galvanized square pipe than round pipe in color steel shed, and the galvanized square pipe has stronger rust prevention ability. When laying on the roof, it should be stable, unlike the circular tube laid on the roof, which is easy to slide down. Moreover, when the colored tiles have been laid, galvanized square pipes are easier to make self-tapping screws, and the safety factor is also high. On the other hand, the circular tube is easy to slip and unsafe factors are easy to appear.