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Type 2 Niobium vs. Type 3 Niobium

Both Type 2 niobium and Type 3 niobium are otherwise unclassified metals. Both are furnished in the annealed condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is Type 2 niobium and the bottom bar is Type 3 niobium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
110
Elastic (Young's, Tensile) Modulus, GPa 110
100
Elongation at Break, % 29
23
Poisson's Ratio 0.4
0.4
Shear Modulus, GPa 38
38
Tensile Strength: Ultimate (UTS), MPa 140
220
Tensile Strength: Yield (Proof), MPa 82
140

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Specific Heat Capacity, J/kg-K 270
270
Thermal Conductivity, W/m-K 52
42
Thermal Expansion, µm/m-K 7.3
7.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.6
Embodied Water, L/kg 160
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 35
44
Resilience: Unit (Modulus of Resilience), kJ/m3 32
93
Stiffness to Weight: Axial, points 6.8
6.8
Stiffness to Weight: Bending, points 18
18
Strength to Weight: Axial, points 4.6
7.2
Strength to Weight: Bending, points 7.1
9.5
Thermal Diffusivity, mm2/s 23
18
Thermal Shock Resistance, points 13
21

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.010
Hafnium (Hf), % 0 to 0.020
0 to 0.020
Hydrogen (H), % 0 to 0.0015
0 to 0.0015
Iron (Fe), % 0 to 0.010
0 to 0.0050
Molybdenum (Mo), % 0 to 0.020
0 to 0.010
Nickel (Ni), % 0 to 0.0050
0 to 0.0050
Niobium (Nb), % 99.5 to 100
98.6 to 99.2
Nitrogen (N), % 0 to 0.010
0 to 0.010
Oxygen (O), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.0050
0 to 0.0050
Tantalum (Ta), % 0 to 0.3
0 to 0.1
Titanium (Ti), % 0 to 0.030
0 to 0.020
Tungsten (W), % 0 to 0.050
0 to 0.030
Zirconium (Zr), % 0 to 0.020
0.8 to 1.2