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What is the percentage weight of carbon in cementite?

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in Casting-Forming-Welding II by (119k points)
What is the percentage weight of carbon in cementite?

(a) 5.53%

(b) 6.67%

(c) 7.23%

(d) 8.39%

I got this question in an internship interview.

Origin of the question is Transformation in Steel in section Heat treatment of Metals and Alloys of Casting-Forming-Welding II

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The correct answer is (b) 6.67%

To explain: None.

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