Search:

Specialty Metals That Make Our WorldTM
  Products
  • CPI Zirconium
  • Product Table
  Datasheets
    Zirconium:
  • Zircadyne 702/705
  • - in Chloride Solutions
  • - in Nitric Acid
  • - in Sulfuric acid
  • - in Organic Applications
  • Chemicals
  • Machining & Forming Operations
    Hafnium:
  • Chemicals
    Niobium:
  • Niobium
  • - C-103
  • Machining & Forming Operations
    Titanium:
  • Titanium Alloys
  • Titanium Value Armor
  • ATI 425 Titanium Alloy
  • Titanium Bar & Wire
    Others:
  • Silicon Tetrachloride
  • Powder Metals
  • Special Alloy Fabrication

 
PROPERTIES

Niobium is a soft, ductile metal which can be cold worked over 90 percent before annealing becomes necessary. In appearance, the metal is somewhat similar to stainless steel. The density of 8.57 gm/cc is moderate compared to the majority of the high melting point metals, being less than molybdenum at 10.2 gm/cc and only half that of tantalum at 16.6 gm/cc.
TABLE 1 - PROPERTIES of NIOBIUM (Nb)

Physical

Melting Point
(°C)   2468
Boiling Point (°C)   4927
Density (g/cm3)   8.57
Crystal Structure     Body Centered Cubic
Lattice Constant Angstroms   3.30
Covalent Radius Angstroms   1.34
Thermal Neutron Absorption Cross Section (barns)   1.1
Electronegativity (Pauling's)   1.6
Thermal Conductivity @ 0° C J (sec cm °C)   0.523
  @ 1600° C J (sec cm °C)   0.691
Coefficient of Thermal Expansion @ 20° C ( x 10-6/°C)   7.1
Electric Resistivity (Microhm)   15
Temperature Coefficient ( x 10-3/°C)   3.95
Volume Electric Conductivity %IACS*   13.3
Specific Heat @ 15°C (J/g)   .268
  @ 1227°C (J/g)   .320
Heat Capacity (Cp) (J/mol °C) 0°C 24.9
    1200°C 29.7
    2700°C 33.5

Mechanical

Modulus of Elasticity ( x 10-6 kg/cm6) 1.05
Poisson's ratio   0.38
Hardness (VHN) 60-100
Resistance to Thermal Shock   Good
Workability ductile to brittle transition -150°C
Recrystallization Temp. GR I and II 900-1300 °C (1652-2372 °F)
  RRR Grade 750-850 °C (1382-1562 °F)
Stress Relieving Temp. (SRT) GR I and II 800 °C (1472 °F)
  RRR Grade 649-663 °C (1200-1225 °F)

Page 5 of 34 Next

INDEX  •  CORROSION RESISTANCE PROPERTIES  •  FABRICATION   
NIOBIUM PRODUCTS   •  SPECIFICATIONS of NIOBIUM   
NIOBIUM ELECTRONICS APPLICATIONS