Protective gas used in the annealing furnace for steel coil comprises – McqOptions

MCQOPTIONS

1.	Protective gas used in the annealing furnace for steel coil comprises of
A.	95% N2 + 5% H2
B.	5% H2 + 9% N2
C.	100% CO
D.	100 %H2
Answer» B. 5% H2 + 9% N2

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