Engineering Materials
The hardness of steel primarily depends on

Percentage of carbon
Heat treatment employed
Shape of carbides and their distribution in iron
Percentage of alloying elements

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Engineering Materials
The charge of the blast furnace consists of

Calcined ore, coke and limestone all in equal parts
Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
Calcined ore (1 part), coke (8 parts) and limestone (4 parts)
Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

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