Pig iron straight from the furnace contains impuities so is too brittle.
All the impurities removed from piig iron gives pure iron which is too soft for most uses.
Iron that is alloyed with other elements is called steel. Atoms in pure iron are aranged in layers so slide over each other easilly hence why it is so soft.
Carbon steels are iron with small amounts of Carbon, this is used for bodies of cars, knives, machinery, ships ect
Low-alloy steels are more expensive as they contain more other metals ie nickel and chromium. These are used for long span bridges and military armour plating.
High-alloy steels are even more expensive. Chromium-Nickel steels are known as stainless steel. Used for cooking utensils and cutlery. They are strong, and have great resistance to corrosion. They do not rust.
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