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R31539 Cobalt vs. ACI-ASTM CN7M Steel

R31539 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CN7M steel belongs to the iron alloys. They have a modest 25% 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 CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
44
Fatigue Strength, MPa 310 to 480
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
480
Tensile Strength: Yield (Proof), MPa 590 to 940
200

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1360
1410
Melting Onset (Solidus), °C 1290
1450
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
21
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.2
5.6
Embodied Energy, MJ/kg 110
78
Embodied Water, L/kg 530
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
170
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
110
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
17
Strength to Weight: Bending, points 27 to 32
17
Thermal Diffusivity, mm2/s 3.5
5.6
Thermal Shock Resistance, points 24 to 32
12

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.070
Chromium (Cr), % 26 to 30
19 to 22
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 0 to 0.75
37.4 to 48.5
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
2.0 to 3.0
Nickel (Ni), % 0 to 1.0
27.5 to 30.5
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