Copper occurs naturally in nature, but steel is an alloy of metal. The components of steel include iron and different amounts of carbon, while copper is an element having the atomic symbol Cu with an atomic number of 29.
Steel is an alloy, which contains over two elements, with the chief of it being iron and carbon. While copper has great resistance to corrosion, steel, on the other hand, can actually rust. Copper does corrode easily in moist air, and it darkens while forming layers of copper oxide.
Steel, because it is composed of more carbon and iron, will rust in moist air. Both copper and steel are good conductors of heat and electricity; copper has a higher conductivity than steel. Copper is very ductile; it is soft and non-magnetic, but steel is very magnetic, and it can be fashioned into several shapes and forms. Copper is weaker than steel.