Steel pipes are commonly used in construction to protect electrical wiring, transporting water, gasses. They are very strong in comparison to their weight which can be very light.
Beams can be used in the construction of buildings, think of the classic picture of construction workers eating lunch on a crossbeam of a skyscraper.
From automobile and oiling industries to sports and health equipment, steel bars have a wide range of uses. Shipped per container or stowed in a large hold on board of a vessel.