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Question

Hardness of steel depends upon amount of ________.

A.

pearlite

B.

ferrite

C.

cementite

D.

martensite

Answer ( Option C)

cementite

Solution

Hardness of steel depends upon the amount of cementite (Fe3C)  .  

Hardness of material depends on the amount of the carbon (6.67% carbon in cementite) present. As carbon content increases, hardness increases.

Hence, the correct option is (C).

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