MakeItFrom.com
Menu (ESC)

R30021 Cobalt vs. ACI-ASTM CE8MN Steel

R30021 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CE8MN steel belongs to the iron alloys. They have a modest 33% 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 R30021 cobalt and the bottom bar is ACI-ASTM CE8MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
29
Fatigue Strength, MPa 250
370
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 700
750
Tensile Strength: Yield (Proof), MPa 500
500

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1440
Melting Onset (Solidus), °C 1190
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
13

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
190
Resilience: Unit (Modulus of Resilience), kJ/m3 570
620
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
27
Strength to Weight: Bending, points 21
23
Thermal Diffusivity, mm2/s 3.8
4.2
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.080
Chromium (Cr), % 26 to 29
22.5 to 25.5
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
56 to 66.4
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
3.0 to 4.5
Nickel (Ni), % 2.0 to 3.0
8.0 to 11
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.5
Sulfur (S), % 0
0 to 0.040