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R31233 Cobalt vs. ACI-ASTM CF3 Steel

R31233 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CF3 steel belongs to the iron alloys. They have a modest 33% 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 (5, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is ACI-ASTM CF3 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
60
Fatigue Strength, MPa 220
270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1020
510
Tensile Strength: Yield (Proof), MPa 420
250

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1330
1450
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 12
16
Thermal Expansion, µm/m-K 13
16

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 8.6
7.8
Embodied Carbon, kg CO2/kg material 8.4
3.2
Embodied Energy, MJ/kg 110
45
Embodied Water, L/kg 480
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
250
Resilience: Unit (Modulus of Resilience), kJ/m3 410
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
18
Strength to Weight: Bending, points 26
18
Thermal Diffusivity, mm2/s 3.2
4.3
Thermal Shock Resistance, points 25
11

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.030
Chromium (Cr), % 23.5 to 27.5
17 to 21
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
62.9 to 75
Manganese (Mn), % 0.1 to 1.5
0 to 1.5
Molybdenum (Mo), % 4.0 to 6.0
0 to 0.5
Nickel (Ni), % 7.0 to 11
8.0 to 12
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.050 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.020
0 to 0.040
Tungsten (W), % 1.0 to 3.0
0