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Presence of SO2 in furnace gases attacks the ferrous metal by way of | |
A. | accelerating the rate of scaling. [Wrong Answer] |
B. | causing metal embrittlement. [Wrong Answer] |
C. | attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature. [Wrong Answer] |
D. | all (a), (b) and (c). [Correct Answer] |