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R31539 Cobalt vs. ACI-ASTM CC50 Steel

R31539 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CC50 steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is ACI-ASTM CC50 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
430

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1420
Melting Onset (Solidus), °C 1290
1370
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.6
Embodied Carbon, kg CO2/kg material 8.2
2.7
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 530
170

Common Calculations

Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 33 to 44
16
Strength to Weight: Bending, points 27 to 32
17
Thermal Diffusivity, mm2/s 3.5
4.5
Thermal Shock Resistance, points 24 to 32
14

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.5
Chromium (Cr), % 26 to 30
26 to 30
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
62.9 to 74
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 4.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0
0 to 0.040