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R30021 Cobalt vs. Type 2 Niobium

R30021 cobalt belongs to the cobalt alloys classification, while Type 2 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 R30021 cobalt and the bottom bar is Type 2 niobium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 9.0
29
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 86
38
Tensile Strength: Ultimate (UTS), MPa 700
140
Tensile Strength: Yield (Proof), MPa 500
82

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Specific Heat Capacity, J/kg-K 450
270
Thermal Conductivity, W/m-K 15
52
Thermal Expansion, µm/m-K 11
7.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.6
Embodied Water, L/kg 520
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
35
Resilience: Unit (Modulus of Resilience), kJ/m3 570
32
Stiffness to Weight: Axial, points 15
6.8
Stiffness to Weight: Bending, points 24
18
Strength to Weight: Axial, points 23
4.6
Strength to Weight: Bending, points 21
7.1
Thermal Diffusivity, mm2/s 3.8
23
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.010
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Hafnium (Hf), % 0
0 to 0.020
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 0 to 3.0
0 to 0.010
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.020
Nickel (Ni), % 2.0 to 3.0
0 to 0.0050
Niobium (Nb), % 0
99.5 to 100
Nitrogen (N), % 0
0 to 0.010
Oxygen (O), % 0
0 to 0.025
Silicon (Si), % 0 to 1.5
0 to 0.0050
Tantalum (Ta), % 0
0 to 0.3
Titanium (Ti), % 0
0 to 0.030
Tungsten (W), % 0
0 to 0.050
Zirconium (Zr), % 0
0 to 0.020