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ACI-ASTM CF20 Steel vs. R30016 Cobalt

ACI-ASTM CF20 steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 24% 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 (10, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF20 steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 50
8.4
Fatigue Strength, MPa 240
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 530
1010
Tensile Strength: Yield (Proof), MPa 250
580

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1410
1270
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 17
14

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 3.1
7.7
Embodied Energy, MJ/kg 44
110
Embodied Water, L/kg 150
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
72
Resilience: Unit (Modulus of Resilience), kJ/m3 160
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
33
Strength to Weight: Bending, points 19
26
Thermal Diffusivity, mm2/s 4.3
3.9
Thermal Shock Resistance, points 11
24

Alloy Composition

Carbon (C), % 0 to 0.2
0.9 to 1.4
Chromium (Cr), % 18 to 21
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 64.2 to 74
0 to 3.0
Manganese (Mn), % 0 to 1.5
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 8.0 to 11
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0.2 to 2.0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
3.5 to 5.5