Alloy steel is steel that contains more than one alloying material other than carbon. The addition is deliberately done to achieve certain physical properties. It generally contains silicon and manganese maintaining the same level as carbon steel. There are further additions of chromium, nickel and vanadium. Not so often add-ons of boron, columbium, tungsten, and nickel are found as well. While some types of sheets, such as copper sheets, are made from a pure metal that has not been combined with other elements, alloys are not. This is because while copper sheets may be advantageous in certain circumstances due to its pure nature, different elements combined in different ways can help to strengthen each other’s properties. They are utilized in a wide range of applications and can be custom melt to suit some particular application.