Age hardening is a process done at______________?
A. Heating at 700C for 10 15 min and quenching in water
B. Heating at 700C for 1 hour and quenching in water
C. Heating above 700C for 30 min and quenching in water
D. Heating up to 200 450C for 15 30 min and quenching in water
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