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Cooling of hypoeutectoid steels in done is furnace by decreasing the temperature to at least ________ below the A1 line.

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Cooling of hypoeutectoid steels in done is furnace by decreasing the temperature to at least ________ below the A1 line.

(a) 4^oC

(b) 10^oC

(c) 16^oC

(d) 30^oC

I have been asked this question by my school principal while I was bunking the class.

Origin of the question is Annealing topic in portion Heat Treatment of Engineering Material & Metallurgy

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The correct choice is (d) 30^oC

For explanation I would say: For full annealing of this steel, it is heated 30-60^oC above the A3 line. Then it is cooled within the furnace by decreasing the temperature 10-30^oC per hour, to at least 30^oC below A1 line.

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