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R31538 Cobalt vs. C68800 Brass

R31538 cobalt belongs to the cobalt alloys classification, while C68800 brass belongs to the copper alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is C68800 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 13 to 23
2.0 to 36
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
41
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
570 to 890
Tensile Strength: Yield (Proof), MPa 580 to 930
390 to 790

Thermal Properties

Latent Heat of Fusion, J/g 320
190
Melting Completion (Liquidus), °C 1360
960
Melting Onset (Solidus), °C 1290
950
Specific Heat Capacity, J/kg-K 450
400
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 13
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
18
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
20

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.2
Embodied Carbon, kg CO2/kg material 8.1
2.8
Embodied Energy, MJ/kg 110
48
Embodied Water, L/kg 530
350

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
16 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
710 to 2860
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 24
19
Strength to Weight: Axial, points 34 to 45
19 to 30
Strength to Weight: Bending, points 27 to 32
19 to 25
Thermal Diffusivity, mm2/s 3.5
12
Thermal Shock Resistance, points 25 to 33
19 to 30

Alloy Composition


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Aluminum (Al), % 0
3.0 to 3.8
Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0.25 to 0.55
Copper (Cu), % 0
70.8 to 75.5
Iron (Fe), % 0 to 0.75
0 to 0.2
Lead (Pb), % 0
0 to 0.050
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
Zinc (Zn), % 0
21.3 to 24.1
Residuals, % 0
0 to 0.5