Case hardening of steel – McqOptions

MCQOPTIONS

1.	Case hardening of steel
A.	Improves surface finish
B.	Is the hardening of the casing or surface of steel above steel by proper heat treatment
C.	Involves diffusion of carbon & nitrogen in the surface of steel above the critical temperature on heating
D.	Is the saturation of surface of steel with any element by its diffusion from the surrounding medium at high temperature
Answer» C. Involves diffusion of carbon & nitrogen in the surface of steel above the critical temperature on heating

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