Engineering Materials
Tensile strength of steel can be safely increased by

Adding carbon up to 6.3%
Adding carbon up to 0.83%
Adding small quantities of copper
Adding carbon up to 2.8%

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Engineering Materials
The charge of the blast furnace consists of

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

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