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      Heat treatment is a term applied to a variety of procedures for changing the   characteristics of metal by heating and cooling. By proper heat treatment, it is possible to obtain certain characteristics in metal such as hardness, tensile strength (ability to resist stretching), and ductility. The procedures of heat treatment of steel include hardening, tempering, annealing, and case hardening.
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1.Hardening     Hardening is a process of heating and cooling steel to increase its ha ...

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