Cobalt
Cobalt : Cobalt hard, silvery-gray, in terms of the behavior and properties of nickel and iron is a metal very similar.
Cobalt, iron when incorporated to prevent softening at high temperatures, hence breathable steel is the most important alloying element. Cobalt, in particular by electrolysis, the other metals used in the coating.
Cobalt plating, nickel plating, because it is very bright and is better than hard. Cobalt steel in air are between 5 and 12%. Cobalt, up to 40% when added to steel magnetization characteristics improves. For this reason, the magnets is an indispensable alloying elements.