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mechanical engineering engineering materials
1. In process annealing, the hypo-eutectoid steel is
(A): heated below or close to the lower critical temperature and then cooled slowly
(B): heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
(C): heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
(D): heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
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