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Flame hardening can only be performed on steels with a minimum of ______ carbon.

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Flame hardening can only be performed on steels with a minimum of ______ carbon.

(a) 0.4%

(b) 0.8%

(c) 1.2%

(d) 1.8%

This question was addressed to me in an interview.

The above asked question is from Selective Hardening topic in division Heat Treatment of Engineering Material & Metallurgy

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Correct answer is (a) 0.4%

To explain: Flame hardening is a selective hardening process with a combustible gas flame as the source of heat for austenizing. This process can only be performed with steels with a high carbon content of at least 0.4%. This is in order to allow hardening of the surface.

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