Aluminium is a lightweight material and is used to make bed frames and headboards because it can be easily shaped and transported. Aluminium is also an inexpensive metal, making the production of aluminium-based beds relatively cheap.

Aluminium naturally generates a protective oxide coating and is highly resistant to corrosion. 

Iron is the most widely used metal in the world and is considered more of a heavyweight metal; certainly heavier than Aluminum. As a result, Iron bed frames can sometimes be difficult to move.

Iron is prone to rust, so products made of this metal should be treated with rust-preventing solutions.

Steel is a very strong metal, resistant to wear. An alloy of Iron and Carbon, steel is a common material used for bed frames. 

Brass is not as light as Aluminium and not as heavy as Iron. An alloy of Copper and Zinc, brass has a bright gold-like appearance.  

Beds can be 100% brass or brass plated, which is a cheaper alternative with pleasing aesthetic results.