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How much is the Brinell hardness of martensite?

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in Casting-Forming-Welding II by (119k points)
How much is the Brinell hardness of martensite?

(a) 600-650

(b) 650-700

(c) 750-800

(d) 800-850

The question was posed to me in an online quiz.

Asked question is from Cooling Curve for Pure Iron in section Heat treatment of Metals and Alloys of Casting-Forming-Welding II

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Right answer is (b) 650-700

Explanation: Martensite is a ferro-magnetic substance in nature, and it is known to have Brinell hardness ranging from 650-700.

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