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ACI-ASTM CE8MN Steel vs. R30012 Cobalt

ACI-ASTM CE8MN steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 28% 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 ACI-ASTM CE8MN steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 29
1.0
Fatigue Strength, MPa 370
320
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 750
830
Tensile Strength: Yield (Proof), MPa 500
650

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.8
Embodied Carbon, kg CO2/kg material 4.2
8.3
Embodied Energy, MJ/kg 58
120
Embodied Water, L/kg 180
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 620
960
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27
26
Strength to Weight: Bending, points 23
22
Thermal Diffusivity, mm2/s 4.2
3.8
Thermal Shock Resistance, points 21
23

Alloy Composition

Carbon (C), % 0 to 0.080
1.4 to 2.0
Chromium (Cr), % 22.5 to 25.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 56 to 66.4
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 3.0 to 4.5
0 to 1.0
Nickel (Ni), % 8.0 to 11
0 to 3.0
Nitrogen (N), % 0.1 to 0.3
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 2.0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
7.5 to 9.5