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An iron base alloy usually containing carbon and other alloying elements. In carbon steel and low alloy steel, the maximum carbon content is about 2.0%; in high alloy steel, about 2.5%. The dividing line between low alloy and high alloy steels is generally regarded as the 5% level of total metallic alloying elements. Steel is differentiated from two general classes of iron namely, cast irons, which have high carbon concentrations, and relatively pure irons, which have low carbon concentrations.