Engineering Materials
The hardness is the property of a material due to which it

Breaks with little permanent distortion
Can cut another metal
Can be rolled or hammered into thin sheets
Can be drawn into wires

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Engineering Materials
Malleable cast iron

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Is produced by annealing process. It is soft, tough, and easily machined metal

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Engineering Materials
Recrystallization temperature is one

At which change of allotropic form takes place
At which crystals first start forming from molten metal when it is cooled
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
At which crystals grow bigger in size

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