Engineering Materials
Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities
50% or more iron
80% or more iron
Alloying elements like chromium, tungsten nickel and copper

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Engineering Materials
The charge of the blast furnace consists of

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

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