Rectangular hollow sections or rec tubes are cold formed and welded from either hot rolled, cold rolled, pre-galvanized or stainless steel.In order to form the rectangular steel section the appropriate mother tube, a round steel tube, has to be formed first. From a round tube rolls are used that progressively press the round tube into a rectangular hollow section. Square and rectangular steel tubes have the advantage of being stronger in bending while a round hollow section has more stiffness in twisting.
The versatility of these sections allows for a wide range of applications as industrial sheds and exhibition stalls to space frames and sign supporting structures. The sections can also be utilised for large span portal frames, amusement parks and playground equipments, guard rails for staircases, sports galleries, pedestrian walkovers, bridges and bus stands amongst other uses.
They have increased tensile capacity because of concentric connections and increased compressive strength because of higher radius of gyration.
Outer smooth profile ensures no trappings of dirt and water, thus reducing chances of corrosion reaction.