Nickel is one of the oldest and most common of alloy element. The addition of nickel increases strength, yield point,hardness,and ductility.It also increases the depth of hardening.Nickel increase corrosion resistance and is one of the major constituents of the “stainless”or corrosion-resisting steels.Nickel steels have been used for components in automobiles and other vehicles,including aircraft,and for a multitude of components such as gears,shafting which require great strength,and other heavy duty products.