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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).
Summary: 1  There are two major categories of metals: ferrous metals and non-ferrous metals. 2  The word âferrousâ comes from the Latin word âferrum,â which means âanything that contains iron.â. 3  Ferrous metals are types of metals that contain iron while non-ferrous metals do not contain iron.