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R31538 Cobalt vs. C71520 Copper-nickel

R31538 cobalt belongs to the cobalt alloys classification, while C71520 copper-nickel belongs to the copper alloys. There are 26 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 R31538 cobalt and the bottom bar is C71520 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
140
Elongation at Break, % 13 to 23
10 to 45
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
51
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
370 to 570
Tensile Strength: Yield (Proof), MPa 580 to 930
140 to 430

Thermal Properties

Latent Heat of Fusion, J/g 320
230
Melting Completion (Liquidus), °C 1360
1170
Melting Onset (Solidus), °C 1290
1120
Specific Heat Capacity, J/kg-K 450
400
Thermal Conductivity, W/m-K 13
32
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
5.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
5.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.9
Embodied Carbon, kg CO2/kg material 8.1
5.0
Embodied Energy, MJ/kg 110
73
Embodied Water, L/kg 530
280

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
54 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
67 to 680
Stiffness to Weight: Axial, points 15
8.6
Stiffness to Weight: Bending, points 24
19
Strength to Weight: Axial, points 34 to 45
12 to 18
Strength to Weight: Bending, points 27 to 32
13 to 17
Thermal Diffusivity, mm2/s 3.5
8.9
Thermal Shock Resistance, points 25 to 33
12 to 19

Alloy Composition


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Carbon (C), % 0.15 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
65 to 71.6
Iron (Fe), % 0 to 0.75
0.4 to 1.0
Lead (Pb), % 0
0 to 0.020
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
28 to 33
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.2
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0
0 to 0.020
Zinc (Zn), % 0
0 to 0.5
Residuals, % 0
0 to 0.5