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R30016 Cobalt vs. ACI-ASTM CB30 Steel

R30016 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 (13, in this case) are not shown.

For each property being compared, the top bar is R30016 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 85
77
Tensile Strength: Ultimate (UTS), MPa 1010
500
Tensile Strength: Yield (Proof), MPa 580
230

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 14
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
3.0

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 7.7
2.3
Embodied Energy, MJ/kg 110
33
Embodied Water, L/kg 500
130

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 770
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33
18
Strength to Weight: Bending, points 26
18
Thermal Diffusivity, mm2/s 3.9
5.6
Thermal Shock Resistance, points 24
17

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.3
Chromium (Cr), % 28 to 32
18 to 21
Cobalt (Co), % 49.6 to 66.9
0
Copper (Cu), % 0
0 to 1.2
Iron (Fe), % 0 to 3.0
72.9 to 82
Manganese (Mn), % 0.5 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 1.5
0
Nickel (Ni), % 0 to 3.0
0 to 2.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.2 to 2.0
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Tungsten (W), % 3.5 to 5.5
0