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R30012 Cobalt vs. ACI-ASTM CT15C Steel

R30012 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CT15C 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 CT15C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
23
Fatigue Strength, MPa 320
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 830
500
Tensile Strength: Yield (Proof), MPa 650
190

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1470
1410
Melting Onset (Solidus), °C 1280
1360
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
1.9

Otherwise Unclassified Properties

Density, g/cm3 8.8
8.0
Embodied Carbon, kg CO2/kg material 8.3
6.1
Embodied Energy, MJ/kg 120
88
Embodied Water, L/kg 480
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
90
Resilience: Unit (Modulus of Resilience), kJ/m3 960
93
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
17
Strength to Weight: Bending, points 22
17
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 23
12

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.050 to 0.15
Chromium (Cr), % 27 to 32
19 to 21
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
40.3 to 49.2
Manganese (Mn), % 0
0.15 to 1.5
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
31 to 34
Niobium (Nb), % 0
0.5 to 1.5
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0.15 to 1.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0