Steel

An alloy of iron and carbon. Commercial steels contain more than about 0.05 percent and less than 2 percent carbon, along with manganese, silicon, sulfur and phosphorous. Steel is the least expensive and most widely used metal. Depending on the application, steel contains various amounts of those elements and other alloying metals such as chromium, nickel, manganese silicon, vanadium and molybdenum. Stainless steel is the most common of the alloy steels.