Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?
Correct answer: A. All A., B. and C.
- A. All A., B. and C.
- B. Causing metal embrittlement
- C. Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at
- D. high temperature
- E. Accelerating the rate of scaling
Explanation
Sulphur dioxide in hot furnace gases promotes scaling, can cause embrittlement, and may attack grain boundaries in susceptible steels at high temperature. Therefore the combined option covering all these effects is appropriate.
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