-
About Hafnium
Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Hafnium’s large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors.
Hafnium has good neutron-absorbing properties, and hence it is used in control rods in nuclear reactors, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. While hafnium nitride is the most refractory of all the metal nitrides, hafnium carbide is the most refractory of all the binary materials. With a melting point of about 3900 °C it is one of the most refractory binary compounds known. Hafnium has been successfully alloyed with several metals including iron, titanium and niobium.Hafnium Specifications
Standards Description ASTM B737 This specification covers hot-rolled and/or cold-worked hafnium rod and wire. This specification contains 2 material grades, one sepcifically for nuclear applications (Grade R1) and one for commercial alloying applications (Grade R3). ASTM B776 This specification covers 2 grades of wrought hanium and hafnium alloy strip, sheet, and plate. One sepcifically for nuclear applications (Grade R1) and one for commercial alloying applications (Grade R3). Hafnium Grades
Grade Chemical Component %, max C O N H Fe Mo Zr Ni Si Ti Al Ta HF≥98.8% Grade R1 0.015 0.04 0.05 0.0025 0.025 0.002 0.02 0.05 0.01 0.01 0.01 0.02 remaining Grade R2 0.025 0.025 0.01 0.0015 0.01 0.02 0.02 0.01 0.005 0.03 0.02 0.3 remaining Hafnium Mechanical Properties Form Test Direction UTS, PSI(Mpa) min. YS, PSI(Mpa) min. EL(%) min. Rod Longitudinal 58(400) 22(150) 22 Plate Longitudinal 58(400) 22(150) 20 Plate Transverse 45(310) 25(172) 20 Strip Longitudinal 58(400) 22(150) 20 Strip Transverse 45(310) 25(172) 20
- Top