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Pourbaix diagram of aqueous iron. Outside chemistry, ferrous is an adjective used to indicate the presence of iron. The word is derived from the Latin word ferrum (iron). Ferrous metals include steel and pig iron (with a carbon content of a few percent) and alloys of iron with other metals (such as stainless steel).
Therefore, ferrous and non-ferrous metals are not the same. The main difference is presence of iron in the metal. Non-ferrous metals are mostly preferred over ferrous metals as they do not rust like ferrous metals. Therefore, ferrous metals are used in a variety of applications.