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  Text 1Nonferrous metals and alloys cover a wide range of materials, frommon metals such as aluminum，copper, and magnesium to high-strength, high-temperature alloys, such as those of tungsten, ta

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  Text 1Copper (Cu), first produced in about 4000 BC, and its alloy have properties somewhat similar to those of aluminum and its alloys In addition, they are among the best conductors of electricity

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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 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 1A grinding machine is a random point cutting tool which uses abrasives in the shape of a wheel, bonded to a belt, a stick or simply suspended in liquidOn a cylindrical grinding machine the gri

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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 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 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