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The Axles are made by heating rods of iron embedded in charcoal powder . This process is known as

$ (a)\;\text{Annealing} \\(b)\;\text{Tempering} \\(c)\;\text{case hardening } \\ (d)\;\text{Nitriding } $

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The Axles are made by heating rods of iron embedded in charcoal powder . This process is known as case hardening
Hence c is the correct answer.
answered Mar 17, 2014 by meena.p
 
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The answer is ā€œCā€, case hardening is also known as surface hardening used in making of Axles. This process is used to form a thin layer of harden metal that is called case. It is also used to harden element contents of bars that will be used for pattern welding.
 

answered Feb 25, 2015 by Roger.Barrett
 

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