In the study of metals, it is necessary first to understand basic metal classifications. Metal may exist in the form of a pure metallic element, such as aluminum, copper, load, silver, and so on. Most pure metals, however, are useful for relatively few engineering applications are mixtures of two or more metallic elements known as alloys. A modern automobile has more than one hundred different metals used in its manufacture, most of which are alloys. Thousands of alloy are used in modern industry.www.mapeng.net马棚网机械资讯

Alloys are further classified as ferrous alloys and nonferrous alloys. The ferrous alloys contain iron as the base metal, and one or more other metallic elements. Nonmetallic elements also may be included. The base metal is generally the metal in largest proportion. For steels, the base metal is iron. Examples of ferrous alloys include nickel steel, stainless steel, vanadium steel, and alloyed cast iron. All steels which have metallic elements intentionally added to change their properties are ferrous alloys.www.mapeng.net马棚网机械资讯

Nonferrous alloys do not contain iron, except in very small amounts in the from of impurities. Examples of nonferrous alloys are brass. Bronze, and monel. Brass is a copper-base alloy which is composed largely of copper and zine. Bronze is also a copper-base alloy composed largely of copper and tin. Monel is a nickel-base ally composed largely of nickel and copper.www.mapeng.net马棚网机械资讯