GATE ME 2022 Set 1 — Question 27

MSQ+1 / -0EasyTempering & Case HardeningHeat TreatmentEngineering Materials

Engineering Materials → Heat Treatment → Tempering & Case Hardening

Last updated 5 September 2026

Question

Which of the following heat treatment processes is/are used for surface hardening of steels?

Correct answer (A) Carburizing; (B) Cyaniding; (D) Carbonitriding Solution Surface hardening (or case hardening) processes are designed to produce a hard, wear-resistant surface layer while maintaining a tough, ductile core. Common methods include: Carburizing (A): Diffusion of carbon into the surface of low-carbon steel. Cyaniding (B): Diffusion of both carbon and nitrogen into the surface using a liquid cyanide bath. Carbonitriding (D): A gas-phase process that diffuses both carbon and nitrogen into the surface. Annealing (C) is a bulk heat treatment process used to soften the material, improve ductility, and relieve internal stresses; it is not a surface hardening process. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (A) Carburizing; (B) Cyaniding; (D) Carbonitriding Solution Surface hardening (or case hardening) processes are designed to produce a hard, wear-resistant surface layer while maintaining a tough, ductile core. Common methods include: Carburizing (A): Diffusion of carbon into the surface of low-carbon steel. Cyaniding (B): Diffusion of both carbon and nitrogen into the surface using a liquid cyanide bath. Carbonitriding (D): A gas-phase process that diffuses both carbon and nitrogen into the surface. Annealing (C) is a bulk heat treatment process used to soften the material, improve ductility, and relieve internal stresses; it is not a surface hardening process.

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