Question

For normalising, the steel is heated ___________ its upper critical temperature.

(a) 30-40^oC above

(b) 30-40^oC C below

(c) 50-60^oC C above

(d) 50-60^oC C below

I have been asked this question in an online quiz.

Question is taken from Normalising & Quenching topic in portion Heat Treatment of Engineering Material & Metallurgy

Answer 1

Right option is (c) 50-60^oC C above

To explain: For hypoeutectoid steels, normalising is done by heating the steel 50-60^oC C above its upper critical temperature (A3 line). For hypereutectoid steels, it is heated above the Acm line. The steel is held at that temperature for some time and then allowed to cool in still air.