GATE ME 2025 Set 1 — Question 20
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Engineering Materials → Heat Treatment → Tempering & Case Hardening
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Question
Among the following surface hardening processes, steel is heated to the lowest temperature in
Correct answer
(C) nitriding
Solution
Nitriding is a surface hardening process where nitrogen is diffused into the surface of the steel. It is typically performed at temperatures between and , which is below the lower critical temperature () of steel (ferritic state). In contrast, carburizing ( to ), cyaniding ( to ), and carbonitriding ( to ) involve heating the steel into the austenitic region to facilitate the diffusion of carbon.
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