Nickel

(Chemical symbol Ni). Nickel is the main constituent in monel metal, permalloy and nickel-chromium alloys. It is also used in cupro-nickel, nickel-silver, various types of steel and cast iron, brass, bronze and light alloys. In steel, in percentage of 0.5% - 5.0%, it increases the toughness and tensile strength without affecting ductility.