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ACI-ASTM CC50 Steel vs. R31539 Cobalt

ACI-ASTM CC50 steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CC50 steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 430
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1370
1290
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 17
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.4
Embodied Carbon, kg CO2/kg material 2.7
8.2
Embodied Energy, MJ/kg 39
110
Embodied Water, L/kg 170
530

Common Calculations

Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 16
33 to 44
Strength to Weight: Bending, points 17
27 to 32
Thermal Diffusivity, mm2/s 4.5
3.5
Thermal Shock Resistance, points 14
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0 to 0.5
0 to 0.14
Chromium (Cr), % 26 to 30
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 62.9 to 74
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 4.0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0