كتاب " Questions and Answers in Mechanical Engineering Part Two " ، تأليف : اسامة محمد المرضي سليمان ، نقرأ من الكتاب :
There are mainly two types of materials. First one is metal and other one is nonmetals. Metals are classified into two types: Ferrous metals and Non-ferrous metals. Ferrous metals mainly consist iron with comparatively small addition of other materials. It includes iron and its alloy such as cast iron, steel, HSS etc. Ferrous metals are widely used in mechanical industries for its various advantages.
Nonferrous metals contain little or no iron. It includes aluminum, magnesium, copper, zinc etc.