Question

How long is the heating process for carbonitriding done for?

(a) 1-2 hours

(b) 2-10 hours

(c) 12-20 hours

(d) 24-30 hours

This question was posed to me in an online quiz.

I'd like to ask this question from Nitriding, Cyaniding and Carbonitriding topic in chapter Heat Treatment of Engineering Material & Metallurgy

Answer 1

Right choice is (b) 2-10 hours

Best explanation: The carbonitriding process is carried out in a gas atmosphere furnace using a carburizing gas such as propane or methane mixed with ammonia. The workpiece is heated to 850^oC in the mixture of gases for 2-10 hours followed by quenching and tempering.