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What is the hardness achieved in the carbonitriding process?

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What is the hardness achieved in the carbonitriding process?

(a) HRC 35

(b) HRC 65

(c) HRC 105

(d) HRC 140

The question was asked during an internship interview.

My enquiry is from Nitriding, Cyaniding and Carbonitriding topic in division Heat Treatment of Engineering Material & Metallurgy

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The correct option is (b) HRC 65

The explanation is: Carbonitriding process of surface hardening results in a case depth of 0.5 mm and a hardness after heat treatment of HRC 65. Interestingly, carburizing and cyaniding also result in equal hardness after heat treatment.

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