Case hardening of a material is__________________?

1.	Case hardening of a material is__________________?
A.	Followed by tempering or carburising
B.	Preceded by its tempering
C.	Done to get a soft ductile interior with a very hard surface
D.	Carried out to get extreme hardness in its core
Answer» E.

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Case hardening of a material is__________________?

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