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R31539 Cobalt vs. ACI-ASTM CA28MWV Steel

R31539 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CA28MWV steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is ACI-ASTM CA28MWV steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
11
Fatigue Strength, MPa 310 to 480
470
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
27
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
1080
Tensile Strength: Yield (Proof), MPa 590 to 940
870

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1290
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
4.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
5.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.2
3.1
Embodied Energy, MJ/kg 110
44
Embodied Water, L/kg 530
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
110
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
1920
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
38
Strength to Weight: Bending, points 27 to 32
30
Thermal Diffusivity, mm2/s 3.5
6.6
Thermal Shock Resistance, points 24 to 32
40

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.2 to 0.28
Chromium (Cr), % 26 to 30
11 to 12.5
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
81.4 to 85.8
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.5 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0.9 to 1.3
Nickel (Ni), % 0 to 1.0
0.5 to 1.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
0.9 to 1.3
Vanadium (V), % 0
0.2 to 0.3