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R30012 Cobalt vs. ACI-ASTM CB30 Steel

R30012 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CB30 steel belongs to the iron alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is ACI-ASTM CB30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 830
500
Tensile Strength: Yield (Proof), MPa 650
230

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1280
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.0

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.7
Embodied Carbon, kg CO2/kg material 8.3
2.3
Embodied Energy, MJ/kg 120
33
Embodied Water, L/kg 480
130

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 960
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
18
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 3.8
5.6
Thermal Shock Resistance, points 23
17

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.3
Chromium (Cr), % 27 to 32
18 to 21
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0 to 1.2
Iron (Fe), % 0 to 3.0
72.9 to 82
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
0 to 2.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Tungsten (W), % 7.5 to 9.5
0