______________ is not a case hardening process?
Correct answer: D. Annealing
- A. Carburising
- B. Nitriding
- C. Cyaniding
- D. Annealing
Explanation
Carburising, nitriding and cyaniding are case-hardening treatments that enrich the surface with carbon or nitrogen. Annealing softens and relieves stresses throughout the steel rather than producing a hard surface case.
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