Heat hardening is the process done at_______________?

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

Submitted By :Ali Uppal

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