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For full annealing of hypoeutectoid steels, they are heated in a range above __________

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For full annealing of hypoeutectoid steels, they are heated in a range above __________

(a) 153-250^oC

(b) 273-350^oC

(c) 551-770^oC

(d) 723-910^oC

The question was posed to me by my college director while I was bunking the class.

I want to ask this question from Annealing in section Heat Treatment of Engineering Material & Metallurgy

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The correct choice is (d) 723-910^oC

Best explanation: Hypoeutectoid steels contain carbon content which is less than 0.77%. For full annealing of this steel, it is heated 30-60^oC above the A3 line. It is held at this temperature for a period of time, and then slowly cooled to room temperature.

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