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Which among the following is not applicable to process annealing of steels?

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in Engineering Material & Metallurgy by (773k points)
Which among the following is not applicable to process annealing of steels?

(a) Low scaling

(b) Rapid

(c) Expensive

(d) Single phase morphology

This question was addressed to me in class test.

This question is from Annealing in chapter Heat Treatment of Engineering Material & Metallurgy

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Right answer is (c) Expensive

Easy explanation: Process annealed steels are heated around 550-650^oC, held for some time for softening, then cooled at any desired rate. This process induces a single phase morphology. This process is cheaper, more rapid, and produces less scaling as the material is not heated at a high temperature like for full annealing.

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