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ACI-ASTM CC50 Steel vs. R30021 Cobalt

ACI-ASTM CC50 steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 32% 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 R30021 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
700

Thermal Properties

Latent Heat of Fusion, J/g 300
330
Melting Completion (Liquidus), °C 1420
1350
Melting Onset (Solidus), °C 1370
1190
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
1.9
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
8.0
Embodied Energy, MJ/kg 39
110
Embodied Water, L/kg 170
520

Common Calculations

Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 16
23
Strength to Weight: Bending, points 17
21
Thermal Diffusivity, mm2/s 4.5
3.8
Thermal Shock Resistance, points 14
21

Alloy Composition

Carbon (C), % 0 to 0.5
0.2 to 0.35
Chromium (Cr), % 26 to 30
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 62.9 to 74
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 4.0
2.0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 1.5
Sulfur (S), % 0 to 0.040
0