Engineering Materials
The charge of the blast furnace consists of

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

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Engineering Materials
Cyaniding is the process of

Obtaining cyanide salts
Dipping steel in cyanide bath
Reacting steel surface with cyanide salts
Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness

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