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R31538 Cobalt vs. ACI-ASTM CD3MWCuN Steel

R31538 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CD3MWCuN steel belongs to the iron alloys. They have a modest 31% 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 (6, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is ACI-ASTM CD3MWCuN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
29
Fatigue Strength, MPa 310 to 480
370
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
790
Tensile Strength: Yield (Proof), MPa 580 to 930
500

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
4.2
Embodied Energy, MJ/kg 110
58
Embodied Water, L/kg 530
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
200
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
620
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
28
Strength to Weight: Bending, points 27 to 32
24
Thermal Diffusivity, mm2/s 3.5
4.2
Thermal Shock Resistance, points 25 to 33
22

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.030
Chromium (Cr), % 26 to 30
24 to 26
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 0 to 0.75
56.6 to 65.3
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
3.0 to 4.0
Nickel (Ni), % 0 to 1.0
6.5 to 8.5
Nitrogen (N), % 0 to 0.25
0.2 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Tungsten (W), % 0
0.5 to 1.0