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Which of the following is not a method of carburizing?

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Which of the following is not a method of carburizing?

(a) Pack carburizing

(b) Gas carburizing

(c) Cyaniding

(d) Nitriding

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Question is taken from Carburizing topic in portion Heat Treatment of Engineering Material & Metallurgy

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Correct answer is (d) Nitriding

Easiest explanation: Carburizing the process by which carbon atoms are introduced onto the surface of steels to produce a hard surface while the interior remains soft. When a piece of low-carbon steel is placed in a carbon saturated temperature, the carbon diffuses into the steel and causes carburizing. Pack carburizing, gas carburizing, and liquid carburizing (cyaniding) are three methods of carburizing.

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