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Among the following surface hardening processes, steel is heated to the lowest temperature in

1. carburizing
2. cyaniding
3. nitriding
4. carbonitriding

Correct answer: nitriding

Solution

Nitriding involves heating steel to a lower temperature compared to the other processes, typically around 500-550°C, which allows for the diffusion of nitrogen into the surface without significantly altering the core properties of the steel.

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