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R30012 Cobalt vs. ACI-ASTM CF16Fa Steel

R30012 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CF16Fa steel belongs to the iron 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 (7, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is ACI-ASTM CF16Fa steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
28
Fatigue Strength, MPa 320
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 830
540
Tensile Strength: Yield (Proof), MPa 650
230

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1280
1370
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.4

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
3.3
Embodied Energy, MJ/kg 120
47
Embodied Water, L/kg 480
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
120
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
19
Strength to Weight: Bending, points 22
19
Thermal Diffusivity, mm2/s 3.8
4.2
Thermal Shock Resistance, points 23
12

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.16
Chromium (Cr), % 27 to 32
18 to 21
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
62.1 to 72.4
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
0.4 to 0.8
Nickel (Ni), % 0 to 3.0
9.0 to 12
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 2.0
Sulfur (S), % 0
0.2 to 0.4
Tungsten (W), % 7.5 to 9.5
0