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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 â Ferrous and Nonferrous Alloys. An alloy is a metal made of two or more metallic elements to enhance strength and corrosion resistance. The key difference between ferrous and nonferrous alloys is that ferrous alloys contain iron in their composition whereas non-ferrous alloys do not contain iron as an element. Both of these alloys are extensively used in the modern industrial and engineering applications, but for different uses.