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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).

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.