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When hard steel is heated to bright redness and then allowed to cool slowly, it gets softened. The process is called

$ (a)\;\text{Hardening} \\(b)\;\text{Tempering } \\(c)\;\text{Quenching } \\ (d)\;\text{Annealing} $
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When hard steel is heated to bright redness and then allowed to cool slowly, it gets softened. The process is called Annealing.
Hence d is the correct answer.
answered Mar 17, 2014 by meena.p
 

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