Rectangular Hollow structural tubes are manufactured from flat steel strips which are formed by continuous sets of rolls. The strips of the edges are heated at big induction welders and then forged together through the welding rolls. Therefore they are produced into longitudinal welds without any filler metals. Then, weld tubes are cooled down and processed through sizing rolls rectangular tubes.
Standard: St 12 (DIN 1623), CS, DS [ASTM A1008], ASTM A500/A500M, Grade A, B & C.
Uses: There is huge scope of this standard – The tubes can be used to support columns and trusses, storage systems, highway guardrails and so on.