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Manganese has a property known as penetration ____________

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Manganese has a property known as penetration ____________

(a) softness

(b) hardness

(c) medium

(d) ductility

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My question comes from Steel and its Alloys-2 topic in section Steel and its Alloys of Aerospace Materials & Processes

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The correct answer is (b) hardness

The explanation: Manganese has a property commonly known as penetration hardness. This is when the manganese is subjected to heat treatment of large sections and hardness penetrates to the core instead of being limited to the surface.

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