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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).
Key Difference: Ferrous and non-ferrous metals are two different types of metals. This categorization is based on the iron content. In case the metal contains iron, it is known as a ferrous metal, otherwise a non-ferrous metal. Ferrous word has been derived from the Latin word ferrum which means 'contains iron'.