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ACI-ASTM CE3MN Steel vs. R30021 Cobalt

ACI-ASTM CE3MN steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 34% 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 CE3MN steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 20
9.0
Fatigue Strength, MPa 380
250
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 770
700
Tensile Strength: Yield (Proof), MPa 590
500

Thermal Properties

Latent Heat of Fusion, J/g 300
330
Melting Completion (Liquidus), °C 1450
1350
Melting Onset (Solidus), °C 1410
1190
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 4.2
8.0
Embodied Energy, MJ/kg 58
110
Embodied Water, L/kg 180
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
57
Resilience: Unit (Modulus of Resilience), kJ/m3 840
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27
23
Strength to Weight: Bending, points 24
21
Thermal Diffusivity, mm2/s 4.1
3.8
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.2 to 0.35
Chromium (Cr), % 24 to 26
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 58.1 to 65.9
0 to 3.0
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 4.0 to 5.0
4.5 to 6.0
Nickel (Ni), % 6.0 to 8.0
2.0 to 3.0
Nitrogen (N), % 0.1 to 0.3
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.040
0