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What is the hardness achieved by flame hardening?

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What is the hardness achieved by flame hardening?

(a) HRC 30-40

(b) HRC 50-60

(c) HRC 80-100

(d) HRC 120-140

This question was posed to me in an internship interview.

I want to ask this question from Selective Hardening in division Heat Treatment of Engineering Material & Metallurgy

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The correct option is (b) HRC 50-60

The best I can explain: Both flame hardening and induction hardening experience similar results. The hardened layer is about 3 mm thick and has a hardness of about HRC 50-60. Distortion can be often minimized in both processes. Additionally, the surface remains clean in induction hardening.

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