Protective gas used in the annealing furnace for steel coil comprises of__________________?
Correct answer: D. 95% N2 + 5% H2
- A. 100% H2
- B. 5% H2 + 9% N2
- C. 100% CO
- D. 95% N2 + 5% H2
Explanation
Annealing steel coils requires a reducing, non-oxidising protective atmosphere, commonly nitrogen diluted with a small amount of hydrogen. A mixture of about 95% N₂ and 5% H₂ prevents scale formation while limiting hydrogen-related risks.
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