Age hardening is a process done at______________?

A. Heating up to 200 450C for 15 30 min and quenching in water

B. Heating above 700C for 30 min and quenching in water

C. Heating at 700C for 1 hour and quenching in water

D. Heating at 700C for 10 15 min and quenching in water

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