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  Text 1Materials differ widely in physical properties, machinability characteristics, methods of forming, and possible service lifeMechanical materials fall into two basic types: metallic or non-meta

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  Text 1By virtue of their wide range of mechanical, physical, and chemical properties, ferrous metals and alloys are among the most useful of all metals Ferrous metals and alloys contain iron as thei

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  Text 1Alloy steels contain significant amounts of alloying elements Structural-grade alloy steels, as identified by ASYM specifications，are used mainly in the construction and transportation Industr

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  Text 1Metals are found everywhere in our life They are classified into two categories, “ferrous” and “non-ferrous” metals Ferrous means relating to, or containing iron and non-ferrous means having n