1.

Heat hardening is the process done at_______________?

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


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