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R30155 Cobalt vs. Type 3 Niobium

R30155 cobalt belongs to the iron alloys classification, while Type 3 niobium belongs to the otherwise unclassified metals. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is Type 3 niobium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
110
Elastic (Young's, Tensile) Modulus, GPa 210
100
Elongation at Break, % 34
23
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 81
38
Tensile Strength: Ultimate (UTS), MPa 850
220
Tensile Strength: Yield (Proof), MPa 390
140

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Specific Heat Capacity, J/kg-K 450
270
Thermal Conductivity, W/m-K 12
42
Thermal Expansion, µm/m-K 14
7.3

Otherwise Unclassified Properties

Density, g/cm3 8.5
8.6
Embodied Water, L/kg 300
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
44
Resilience: Unit (Modulus of Resilience), kJ/m3 370
93
Stiffness to Weight: Axial, points 14
6.8
Stiffness to Weight: Bending, points 23
18
Strength to Weight: Axial, points 28
7.2
Strength to Weight: Bending, points 24
9.5
Thermal Diffusivity, mm2/s 3.2
18
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.010
Chromium (Cr), % 20 to 22.5
0
Cobalt (Co), % 18.5 to 21
0
Hafnium (Hf), % 0
0 to 0.020
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 24.3 to 36.2
0 to 0.0050
Manganese (Mn), % 1.0 to 2.0
0
Molybdenum (Mo), % 2.5 to 3.5
0 to 0.010
Nickel (Ni), % 19 to 21
0 to 0.0050
Niobium (Nb), % 0.75 to 1.3
98.6 to 99.2
Nitrogen (N), % 0 to 0.2
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.0050
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0.75 to 1.3
0 to 0.1
Titanium (Ti), % 0
0 to 0.020
Tungsten (W), % 2.0 to 3.0
0 to 0.030
Zirconium (Zr), % 0
0.8 to 1.2