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Low temperature tempering occurs at __________

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Low temperature tempering occurs at __________

(a) 50-150^oC

(b) 150-250^oC

(c) 350-450^oC

(d) 500-650^oC

The question was posed to me in my homework.

This intriguing question originated from Tempering in portion Heat Treatment of Engineering Material & Metallurgy

1 Answer

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Correct choice is (b) 150-250^oC

For explanation: Tempering temperature is classified into three classes. Low temperature tempering occurs at 150-250^oC. Medium and high temperature tempering occur at 350-450^oC and 500-650^oC correspondingly.

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