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R31538 Cobalt vs. Type 4 Niobium

R31538 cobalt belongs to the cobalt alloys classification, while Type 4 niobium belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is Type 4 niobium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 13 to 23
23
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 86
38
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
220
Tensile Strength: Yield (Proof), MPa 580 to 930
140

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Specific Heat Capacity, J/kg-K 450
270
Thermal Conductivity, W/m-K 13
42
Thermal Expansion, µm/m-K 13
7.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.6
Embodied Water, L/kg 530
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
44
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
93
Stiffness to Weight: Axial, points 15
6.8
Stiffness to Weight: Bending, points 24
18
Strength to Weight: Axial, points 34 to 45
7.2
Strength to Weight: Bending, points 27 to 32
9.5
Thermal Diffusivity, mm2/s 3.5
18
Thermal Shock Resistance, points 25 to 33
21

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.010
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Hafnium (Hf), % 0
0 to 0.020
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 0 to 0.75
0 to 0.010
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.050
Nickel (Ni), % 0 to 1.0
0 to 0.0050
Niobium (Nb), % 0
98.1 to 99.2
Nitrogen (N), % 0 to 0.25
0 to 0.010
Oxygen (O), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.0050
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
0 to 0.020
Tungsten (W), % 0
0 to 0.050
Zirconium (Zr), % 0
0.8 to 1.2