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Flame hardening technique is suitable for ____________

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Flame hardening technique is suitable for ____________

(a) Plain carbon steels

(b) Alloy steels

(c) Cast irons

(d) Pig iron

The question was posed to me during an interview.

Asked question is from Selective Hardening in section Heat Treatment of Engineering Material & Metallurgy

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Right option is (a) Plain carbon steels

The explanation is: Flame hardening is a selective hardening process with a combustible gas flame as the source of heat for austenizing. It is more suitable for plain carbon steels having a carbon composition of 0.4-0.95%. It is used to improve wear resistance and surface hardness of gears, wheels, sheaves, shafts, mills, and other components.

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