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Question #94610

Heat hardening is the process done at_______________?

Options:

A) Heating 750°C and slowly cooling to zero degree

B) Heating quickly upto 450°C followed by sudden quenching

C) Heating upto 250°C for 15 to 30 min

D) Heating at 750°C and then quenching to room temperature

Answer: Heat hardening is the process done at Heating upto 250°C for 15 to 30 min.

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