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ACI-ASTM CN3MN Steel vs. R31539 Cobalt

ACI-ASTM CN3MN steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. They have a modest 29% 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 ACI-ASTM CN3MN steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 39
13 to 22
Fatigue Strength, MPa 250
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 620
1000 to 1340
Tensile Strength: Yield (Proof), MPa 300
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 460
450
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 16
13

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 6.2
8.2
Embodied Energy, MJ/kg 84
110
Embodied Water, L/kg 200
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 210
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
33 to 44
Strength to Weight: Bending, points 20
27 to 32
Thermal Diffusivity, mm2/s 3.4
3.5
Thermal Shock Resistance, points 14
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0 to 0.030
0 to 0.14
Chromium (Cr), % 20 to 22
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 41.4 to 50.3
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 6.0 to 7.0
5.0 to 7.0
Nickel (Ni), % 23.5 to 25.5
0 to 1.0
Nitrogen (N), % 0.18 to 0.26
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0