Question

Liquid carburizing can be used for producing ________ cases.

(a) 0.05-0.1 mm

(b) 0.1-0.25 mm

(c) 0.3-0.6 mm

(d) 0.7-1.0 mm

I got this question in an internship interview.

The query is from Carburizing in division Heat Treatment of Engineering Material & Metallurgy

Answer 1

Right answer is (b) 0.1-0.25 mm

For explanation: Liquid carburizing is carried out in baths of molten salt baths containing 20-50% sodium cyanide, 40% sodium carbonate, and with varying quantities of sodium or barium chloride. The cyanide-rich mixture is heated in iron pots to a temperature of 870-950oC. This process is suitable for producing shallow cases of 0.1-0.25 mm.