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R30021 Cobalt vs. ACI-ASTM CB7Cu-1 Steel

R30021 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CB7Cu-1 steel belongs to the iron alloys. They have a modest 21% 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 CB7Cu-1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
5.7 to 11
Fatigue Strength, MPa 250
420 to 590
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 700
960 to 1350
Tensile Strength: Yield (Proof), MPa 500
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 330
280
Melting Completion (Liquidus), °C 1350
1430
Melting Onset (Solidus), °C 1190
1500
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.6
Embodied Energy, MJ/kg 110
38
Embodied Water, L/kg 520
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 570
1500 to 3590
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
34 to 48
Strength to Weight: Bending, points 21
28 to 35
Thermal Diffusivity, mm2/s 3.8
4.6
Thermal Shock Resistance, points 21
32 to 45

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.070
Chromium (Cr), % 26 to 29
15.5 to 17.7
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
2.5 to 3.2
Iron (Fe), % 0 to 3.0
72.3 to 78.4
Manganese (Mn), % 0
0 to 0.7
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
3.6 to 4.6
Niobium (Nb), % 0
0 to 0.35
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030