Galvanized Rectangle Steel Tube, is an A500 that have been hot dipped in a zinc rich galvanizing process. Galvanized square tubes are a lower cost alternative to stainless steel to achieve rust free protection for many years, while maintaining comparable strength with a durable surface coating.
Galvanized tubes can be cut, machined or welded by common methods used for regular steel, but adequate ventilation should be used to avoid inhalation of fumes when heated.