A hardness depth of about 3 mm can be achieved by induction hardness in ______________ seconds?
Correct answer: A. 5
- A. 5
- B. 100
- C. 250
- D. 500
Explanation
Induction hardening heats only the surface rapidly by electromagnetic induction and then quenches it, so a hardened depth of about 3 mm can develop in roughly 5 seconds. The longer times listed are more typical of slower furnace heating processes.
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