Pick the odd man out of the following?
Correct answer: A. Calorising
- A. Calorising
- B. Pack carburising
- C. Nitriding
- D. Cyaniding
Explanation
Pack carburising, nitriding, and cyaniding are case-hardening treatments that introduce carbon or nitrogen into the surface. Calorising instead produces an aluminium-rich protective surface, so it is the odd one out.
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