32. Hafnium (Hf)
Hafnium (Hf) have the same properties as the zirconium and include heavy metals, has a tensile strength of 340 N/mm2, 180 HV hardness number and melting point of 21300C. Hafnium (Hf) can be formed with the engine at low rpm. Splicing Hafnium be very suitable to provide high current, Hafnium is used as materials for a pressure regulator, water cooler reaktror and others. This is due to the nature of Hafnium, which can reduce the effects of radiation and free Neuton adverse.
33. Zirconium (Zr)
Zirconium (Zr) is a white metal-silver has a melting point 18520C with a tensile strength of 420 N/mm2 and 140 HV hardness numbers. Zirconium has the same properties as titanium, especially in the process of formation. Cutting the machine is done with very low puitaran as cuts in Aluminum. Zirconium fabrication process must be done carefully to the possibility of contamination with oxygen, Nitrogen and Hydrogen due to heating.
Zirconium is sometimes used as an alloying element in meeting the needs of Magnesium match in Nuclear Technology which can reduce the element Zirconium Neutron transversely to the tensile strength runagan stable in temperature, corrosion resistant to water, steam and cooling media. The use of zirconium as well as an alloying element with other materials such as tin (Tin), Iron, Chromium, Nickel, Copper and Molybdenum.
34. Niobium (Nb)
Niobium is a metal that is very ductile (ductile) and soft with a tensile strength of 280 N/mm2 and a melting point of 24690C. Niobium tenacity of this nature is due to the influence of Oxygen and Carbon, heat and air workmanship. Niobium is formed into a thin plate can be welded by resistance-Welding, whereas for thick material above 0.5 mm to be welded by argon-arc or argon-arc welding Spot. Niobium is used and developed to meet the needs of substance use dlam Nuclear Technology and materials for the gas turbine.
Diagram Gambar1.6 melting point of some kind of metal