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In process annealing, the hypo-eutectoid steel is. | |
A. | heated from 30° C to 50° C above the upper critical temperature and then cooled in still air [Wrong Answer] |
B. | heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium [Wrong Answer] |
C. | heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace [Wrong Answer] |
D. | heated below or close to the lower critical temperature and then cooled slowly [Correct Answer] |