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H.C. Starck Pure Niobium (Columbium)

Category Metal , Nonferrous Metal , Niobium Alloy , Refractory Metal , Pure Element
Manufacturer H.C. Starck
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
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Material Notes:
Applications: NRC® niobium metal is produced from electron beam melted ingots. Grain Stabilized Niobium (GSNb) is made by EB and VAR melting. Both materials are malleable, weldable, machineable and formable. GSNb is used in applications where a consistently finer grain size is required.Niobium is used in the manufacture of synthetic diamonds; in sputtering targets for fiber optic applications or architectural glass; in nickel based superalloys; and alloyed with titanium or tin, in superconductors. In nuclear reactors it has low thermal neutron cross section and superior corrosion resistance, It is an excellent getter and finds use in high temperature vacuum furnaces, and is resistant to attack by the molten alkali metals found in sodium vapor lamps.Forms Available: Foil, Sheet, Plate, Welded Tubing, Rod, Wire and Bar.Metallurgical Characteristics: Material is single-phase niobium, stress relieve at 650°C, re-crystallize at 950°C. Crystal structure: bccInformation provided by H.C. Starck.
Physical Properties Metric English Comments
Specific Gravity 8.47 g/cc
8.47 g/cc
Mechanical Properties Metric English Comments
Hardness, Vickers 50 - 80
50 - 80
annealed
Tensile Strength, Ultimate >= 112 MPa
>= 16200 psi
re-crystallized
>= 124 MPa

@Temperature 20.0 °C
>= 18000 psi

@Temperature 68.0 °F
Tensile Strength, Yield >= 84.8 MPa

@Temperature 20.0 °C
>= 12300 psi

@Temperature 68.0 °F
typical
Elongation at Break >= 25 %
>= 25 %
Modulus of Elasticity 103 GPa
15000 ksi
Poissons Ratio 0.38
0.38
Shear Modulus 37.3 GPa
5410 ksi
Calculated
Thermal Properties Metric English Comments
CTE, linear 12.8 µm/m-°C

@Temperature 20.0 - 100 °C
7.10 µin/in-°F

@Temperature 68.0 - 212 °F
Specific Heat Capacity 0.272 J/g-°C

@Temperature 27.0 °C
0.0650 BTU/lb-°F

@Temperature 80.6 °F
Thermal Conductivity 52.3 W/m-K
363 BTU-in/hr-ft²-°F
Melting Point 2468 °C
4474 °F
Component Elements Properties Metric English Comments
Niobium, Nb (Columbium, Cb) >= 99.8 %
>= 99.8 %
Type II - Commercial Grade
>= 99.9 %
>= 99.9 %
Type I - Reactor Grade
Tantalum, Ta <= 0.10 %
<= 0.10 %
Type I - Reactor Grade
<= 0.20 %
<= 0.20 %
Type II - Commercial Grade
Electrical Properties Metric English Comments
Volume Resistivity 0.0000145 ohm-cm

@Temperature 0.000 - 100 °C
0.0000145 ohm-cm

@Temperature 32.0 - 212 °F
Critical Superconducting Temperature 9.20 K
9.20 K
Chemical Properties Metric English Comments
Atomic Mass 92.91
92.91
Atomic Number 41
41
Thermal Neutron Cross Section 1.1 barns/atom
1.1 barns/atom
Descriptive Properties Value Comments
Thermal Resistivity 1
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