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ACI-ASTM CE3MN Steel vs. R30816 Cobalt

ACI-ASTM CE3MN steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CE3MN steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 20
23
Fatigue Strength, MPa 380
250
Poisson's Ratio 0.27
0.3
Shear Modulus, GPa 81
81
Tensile Strength: Ultimate (UTS), MPa 770
1020
Tensile Strength: Yield (Proof), MPa 590
460

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1450
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 4.2
20
Embodied Energy, MJ/kg 58
320
Embodied Water, L/kg 180
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
190
Resilience: Unit (Modulus of Resilience), kJ/m3 840
510
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 27
31
Strength to Weight: Bending, points 24
25
Thermal Diffusivity, mm2/s 4.1
3.3
Thermal Shock Resistance, points 21
28

Alloy Composition

Carbon (C), % 0 to 0.030
0.32 to 0.42
Chromium (Cr), % 24 to 26
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 58.1 to 65.9
0 to 5.0
Manganese (Mn), % 0 to 1.5
1.0 to 2.0
Molybdenum (Mo), % 4.0 to 5.0
3.5 to 4.5
Nickel (Ni), % 6.0 to 8.0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0.1 to 0.3
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5