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R30021 Cobalt vs. Grade 28 Titanium

R30021 cobalt belongs to the cobalt alloys classification, while grade 28 titanium belongs to the titanium alloys. There are 27 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 R30021 cobalt and the bottom bar is grade 28 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 9.0
11 to 17
Fatigue Strength, MPa 250
330 to 480
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
40
Tensile Strength: Ultimate (UTS), MPa 700
690 to 980
Tensile Strength: Yield (Proof), MPa 500
540 to 810

Thermal Properties

Latent Heat of Fusion, J/g 330
410
Melting Completion (Liquidus), °C 1350
1640
Melting Onset (Solidus), °C 1190
1590
Specific Heat Capacity, J/kg-K 450
550
Thermal Conductivity, W/m-K 15
8.3
Thermal Expansion, µm/m-K 11
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
4.5
Embodied Carbon, kg CO2/kg material 8.0
37
Embodied Energy, MJ/kg 110
600
Embodied Water, L/kg 520
370

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
87 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 570
1370 to 3100
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 23
43 to 61
Strength to Weight: Bending, points 21
39 to 49
Thermal Diffusivity, mm2/s 3.8
3.4
Thermal Shock Resistance, points 21
47 to 66

Alloy Composition


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Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0.2 to 0.35
0 to 0.080
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 3.0
0 to 0.25
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.15
Ruthenium (Ru), % 0
0.080 to 0.14
Silicon (Si), % 0 to 1.5
0
Titanium (Ti), % 0
92.4 to 95.4
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0
0 to 0.4