This is a material comprising of two or more elements, one of which will always be a metal. Alloy steels are steels in which additional elements have been added to the usual iron, carbon, manganese and silicon that is present in ordinary carbon steels in order to improve their properties and performance. 

This is a sheet steel which has been coated in a thin, hot-dip, aluminium-silicon alloy.  Although most aluminized coatings are applied to cold rolled carbon steel, sometimes they are used on ferritic stainless steels for example, in the case of car exhausts. Aluminised steel is often applied to ovens, furnaces, vehicle exhaust pipes and bakeware.

Annealing is the term used to describe the process of restoring metal to its desirable properties after rolling and forging once it has been heated. In steel, the process is mostly used on cold rolled products – predominantly sheet, but also wire.