The heat treatment of steel to obtain softness, improved machinability – McqOptions

MCQOPTIONS

1.	The heat treatment of steel to obtain softness, improved machinability, increased ductility, to relieve internal stresses, and to refine the grain size is called
A.	Annealing
B.	Tempering
C.	Nitriding
D.	Hardening
Answer» B. Tempering

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