Iron from a blast furnace contains about 96% iron, the impurites make it brittle and it has few uses.
Most iron is converted into steels. Steels are alloys since they are mixtures are iron with carbon.
Some steels contain other metals.
Alloys can be designed to have properties for specific uses. Low-Carbon steels are easily shaped, high-carbon steels are hard, and stainless steels are resistant to corrosion.
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