15. Cerium (Ce)
Cerium (Ce) is referred to as rare metals (rare earth metal), has a melting point of 6400C can be added into the cast iron for the manufacture of the electrode, the manufacture of electric arc or a lighter stone materials (lighter flints).
16. Cobalt (Co)
Cobalt (Co) is a metal that is silver white brwarna have the melting point 14900C and high magnetic nature. Obtained with the element Nickel Cobalt and certain mineral element-element and separated during the purification process on the element Nickel. Cobalt is used as an alloying element in steel alloys as a cutting tool (Tool Steel) and as an alloying element with the element Nickel as alloy steel that is resistant to high temperatures. Cobalt is also primarily used in the manufacture of components with permanent magnetic properties.
17. Iridium (Ir)
Iridium (Ir) is referred to as white steel is the metal of the Platinum group that has a melting point of 24540C as a Plati