Iron is a hard metal but its alloy steel is used for building bridges, why?
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In the building and construction industry, alloy steels are used for very large modern structures such as airports, bridges, skyscrapers and stadiums in the form of a steel skeleton. Alloy steels provide the required high strength to support such large structures.
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We know that iron is a strong, hard and tough metal, hence it has high resisting power. So, it can resist high load, stress and strain. Also, iron is capable of lifting a load of different things at the same time. However, iron used in construction of bridges experiences rusting due to the action of moisture and water.
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