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R30012 Cobalt vs. ACI-ASTM CK3MCuN Steel

R30012 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CK3MCuN 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 CK3MCuN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
39
Fatigue Strength, MPa 320
250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 830
620
Tensile Strength: Yield (Proof), MPa 650
290

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1280
1350
Specific Heat Capacity, J/kg-K 440
460
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.8
8.0
Embodied Carbon, kg CO2/kg material 8.3
5.6
Embodied Energy, MJ/kg 120
76
Embodied Water, L/kg 480
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
200
Resilience: Unit (Modulus of Resilience), kJ/m3 960
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
21
Strength to Weight: Bending, points 22
20
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 23
14

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.025
Chromium (Cr), % 27 to 32
19.5 to 20.5
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 0 to 3.0
49.5 to 56.3
Manganese (Mn), % 0
0 to 1.2
Molybdenum (Mo), % 0 to 1.0
6.0 to 7.0
Nickel (Ni), % 0 to 3.0
17.5 to 19.5
Nitrogen (N), % 0
0.18 to 0.24
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Tungsten (W), % 7.5 to 9.5
0