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How much chromium is required to provide oxidation resistance for use over 1000^oC?

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How much chromium is required to provide oxidation resistance for use over 1000^oC?

(a) 1%

(b) 6%

(c) 12%

(d) 17%

This question was addressed to me in an internship interview.

Enquiry is from Corrosion and Oxidation Control topic in chapter Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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The correct answer is (d) 17%

The best I can explain: Chromium is added to materials to improve oxidation resistance. Up to 10% chromium is added to oil refinery parts and up to 12% is added for operations up to 1000^oC. Over this temperature, 17% chromium is added.

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