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R31539 Cobalt vs. ACI-ASTM CK20 Steel

R31539 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CK20 steel belongs to the iron alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is ACI-ASTM CK20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
37
Fatigue Strength, MPa 310 to 480
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
530
Tensile Strength: Yield (Proof), MPa 590 to 940
260

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1290
1430
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 13
15

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
4.4
Embodied Energy, MJ/kg 110
62
Embodied Water, L/kg 530
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
160
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
170
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
19
Strength to Weight: Bending, points 27 to 32
19
Thermal Diffusivity, mm2/s 3.5
3.7
Thermal Shock Resistance, points 24 to 32
13

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.2
Chromium (Cr), % 26 to 30
23 to 27
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
46.7 to 58
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.5
Nickel (Ni), % 0 to 1.0
19 to 22
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0
0 to 0.040