Because carbon steel is an alloy hardened by the carbon content, how the steel is used depends on how much carbon it contains. For example, steel made with low carbon content can be used for wrought iron or fencing. Medium-carbon is a significant component for construction projects like bridges and buildings, while high-carbon content steel is used for coils and steel wires. Strength and durability make this steel ideal for cutting tools, saws, drills, knives, and other equipment that requires a heavy-duty cutting edge.