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R31538 Cobalt vs. C18700 Copper

R31538 cobalt belongs to the cobalt alloys classification, while C18700 copper belongs to the copper alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is C18700 copper.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 13 to 23
9.0 to 9.6
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 86
43
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
290 to 330
Tensile Strength: Yield (Proof), MPa 580 to 930
230 to 250

Thermal Properties

Latent Heat of Fusion, J/g 320
210
Melting Completion (Liquidus), °C 1360
1080
Melting Onset (Solidus), °C 1290
950
Specific Heat Capacity, J/kg-K 450
380
Thermal Conductivity, W/m-K 13
380
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
98
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
99

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.0
Embodied Carbon, kg CO2/kg material 8.1
2.6
Embodied Energy, MJ/kg 110
41
Embodied Water, L/kg 530
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
24 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
240 to 280
Stiffness to Weight: Axial, points 15
7.1
Stiffness to Weight: Bending, points 24
18
Strength to Weight: Axial, points 34 to 45
9.0 to 10
Strength to Weight: Bending, points 27 to 32
11 to 12
Thermal Diffusivity, mm2/s 3.5
110
Thermal Shock Resistance, points 25 to 33
10 to 12

Alloy Composition


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Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
98 to 99.2
Iron (Fe), % 0 to 0.75
0
Lead (Pb), % 0
0.8 to 1.5
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0
Residuals, % 0
0 to 0.5