Heat hardening is the process done at_______________?

A.\tHeating 750°C and slowly cooling to zero degree

B.\tHeating quickly upto 450°C followed by sudden quenching

C.\tHeating upto 250°C for 15 to 30 minCorrect Answer

D.\tHeating at 750°C and then quenching to room temperature

Correct Option: C.\tHeating upto 250°C for 15 to 30 min

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