Engineering Materials
Addition of lead and bismuth to aluminium results in

One of the best known age and precipitation hardening systems
Improvement of corrosion resistance
Improving machinability
Improvement of casting characteristics

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

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