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» Niobium Properties
Niobium's ductile-to-brittle transition temperature ranges from -150° to -250°F (-101° to -157°C). This metal also has the low thermal neutron capture cross-section required for nuclear applications.
Its high melting point warrants its use at temperatures above the maximum service temperatures of the iron base, nickel base, and cobalt base metals. It has excellent ductility and fabric ability. Pure niobium has a re crystallization temperature range of 1800 to 2000°F (982° to 1093°C).
| PROPERTY | |
| Atomic Weight | 92.9064 |
| Density | 8.57 g/CC |
| Melting Point | 2468°C |
| Boiling Point | 4927°C |
| Coefficient of Thermal Expansion (20°C) | 7.1 x 10-6/°C |
| Electrical Resistivity (20°C) | 15 microohms-cm |
| Electrical Conductivity | 13.2% IACS |
| Specific Heat | .126 cal/g/°C |
| Thermal Conductivity | .523 cal/cm2/cm°C/sec |
| Crystal Structure | bcc |
| Thermal Neutron Cross Section | 1.1 b |
| Annealed | Ultimate Tensile Strength | 195 M Pa (28 ksi) |
| Yield Strength | 105 M Pa (15 ksi) | |
| % Elongation | 30%+ | |
| % Reduction in Area | 80%+ | |
| Cold Worked | Ultimate Tensile Strength | 585 M Pa (85 ksi) |
| % Elongation | 5% | |
| Hardness | Annealed | 60 HV |
| Cold Worked | 150 HV | |
| Poisson's Ratio | 0.38 | |
| Strain Hardening Exponent | 0.24 | |
| Elastic Modulus | Tension | 103 G Pa (15 x 10-6psi) |
| Shear | 37.5 G Pa (15 x 106psi) | |
| Ductile Brittle Transition Temperature * | <147°K | |
| Re crystallization Temperature | 800 - 1100°C |
* Significantly affected by increasing interstitial contents.
