Which one is not the purpose of heat treatment of steels? – McqOptions

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1.	Which one is not the purpose of heat treatment of steels?
A.	changing the composition of steel on the surface
B.	changing the percentage of carbon and Si in the bulk
C.	increasing or decreasing the grain size
D.	removing undesirable residual stresses
Answer» B. changing the percentage of carbon and Si in the bulk

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