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R05200 Tantalum vs. R30021 Cobalt

R05200 tantalum belongs to the otherwise unclassified metals classification, while R30021 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is R05200 tantalum and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 1.1 to 28
9.0
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 69
86
Tensile Strength: Ultimate (UTS), MPa 210 to 540
700
Tensile Strength: Yield (Proof), MPa 140 to 390
500

Thermal Properties

Latent Heat of Fusion, J/g 140
330
Specific Heat Capacity, J/kg-K 140
450
Thermal Conductivity, W/m-K 59
15
Thermal Expansion, µm/m-K 6.5
11

Otherwise Unclassified Properties

Density, g/cm3 17
8.4
Embodied Water, L/kg 650
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5 to 53
57
Resilience: Unit (Modulus of Resilience), kJ/m3 50 to 420
570
Stiffness to Weight: Axial, points 6.2
15
Stiffness to Weight: Bending, points 11
24
Strength to Weight: Axial, points 3.6 to 9.0
23
Strength to Weight: Bending, points 4.8 to 8.8
21
Thermal Diffusivity, mm2/s 25
3.8
Thermal Shock Resistance, points 13 to 32
21

Alloy Composition

Carbon (C), % 0 to 0.010
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
0 to 3.0
Molybdenum (Mo), % 0 to 0.020
4.5 to 6.0
Nickel (Ni), % 0 to 0.010
2.0 to 3.0
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.010
0
Oxygen (O), % 0 to 0.015
0
Silicon (Si), % 0 to 0.0050
0 to 1.5
Tantalum (Ta), % 99.8 to 100
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
0