The heat treatment process to which castings and the steel balls produced by cold heading are subjected is____________________?
Correct answer: B. Normalising
- A. Tempering
- B. Normalising
- C. Annealing
- D. None of these
Explanation
Normalising heats steel above its critical range and then cools it in air, refining the grain structure and reducing the effects of casting or cold working. Tempering is normally performed after hardening, while annealing gives a softer structure.
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