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Which of the following heat treatment processes is/are used for surface hardening of steels? (A) Carburizing (B) Cyaniding (C) Annealing (D) Carbonitriding

1. Carburizing
2. Cyaniding
3. Annealing
4. Carbonitriding

Correct answer: Carburizing

Solution

Carburizing is a heat treatment process that increases the carbon content on the surface of steel, enhancing its hardness and wear resistance, making it ideal for surface hardening.

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