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R31233 Cobalt vs. ACI-ASTM CN3MN Steel

R31233 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CN3MN steel belongs to the iron alloys. They have a modest 39% 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 CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 17
39
Fatigue Strength, MPa 220
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
80
Tensile Strength: Ultimate (UTS), MPa 1020
620
Tensile Strength: Yield (Proof), MPa 420
300

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1330
1410
Specific Heat Capacity, J/kg-K 440
460
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 13
16

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.1
Embodied Carbon, kg CO2/kg material 8.4
6.2
Embodied Energy, MJ/kg 110
84
Embodied Water, L/kg 480
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
200
Resilience: Unit (Modulus of Resilience), kJ/m3 410
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 33
21
Strength to Weight: Bending, points 26
20
Thermal Diffusivity, mm2/s 3.2
3.4
Thermal Shock Resistance, points 25
14

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
20 to 22
Cobalt (Co), % 44.7 to 63.3
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 1.0 to 5.0
41.4 to 50.3
Manganese (Mn), % 0.1 to 1.5
0 to 2.0
Molybdenum (Mo), % 4.0 to 6.0
6.0 to 7.0
Nickel (Ni), % 7.0 to 11
23.5 to 25.5
Nitrogen (N), % 0.030 to 0.12
0.18 to 0.26
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.050 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.010
Tungsten (W), % 1.0 to 3.0
0