1. Extended tier only

Stainless steel is an alloy of iron. It contains iron, other metals and about 0.5% of carbon.

i) State a use of stainless steel.

[1] 

ii) Name a metal, other than iron, in stainless steel.

[1] 

iii) The iron from the blast furnace is impure. It contains about 5% of carbon and other impurities, such as silicon and phosphorus.

Describe how the percentage of carbon is reduced and the other impurities are removed.

[4]