Steel is a mixture, or [?], between iron and other elements. On its own, pure iron is almost useless. Cast iron from a furnace has lots of it it, so it is rather [?].

Low carbon (0.4 %) steels can be easily shaped and are used for car bodies. However it tends to quite easily. It needs both oxygen and .

Medium carbon (0.8 %) steels are used for items like hammer heads.

High steels (1.5 %) are very strong. They are used for tools. However they can snap if bent.

Other elements like chromium and nickel can be added as well as carbon to alter the properties of the steel. steel does not rust.

Iron is turned into steel by blowing through it. Then the right amounts of carbon and other elements are added.