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R30021 Cobalt vs. Grade 29 Titanium

R30021 cobalt belongs to the cobalt alloys classification, while grade 29 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 29 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 9.0
6.8 to 11
Fatigue Strength, MPa 250
460 to 510
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
40
Tensile Strength: Ultimate (UTS), MPa 700
930 to 940
Tensile Strength: Yield (Proof), MPa 500
850 to 870

Thermal Properties

Latent Heat of Fusion, J/g 330
410
Melting Completion (Liquidus), °C 1350
1610
Melting Onset (Solidus), °C 1190
1560
Specific Heat Capacity, J/kg-K 450
560
Thermal Conductivity, W/m-K 15
7.3
Thermal Expansion, µm/m-K 11
9.3

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
4.5
Embodied Carbon, kg CO2/kg material 8.0
39
Embodied Energy, MJ/kg 110
640
Embodied Water, L/kg 520
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
62 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 570
3420 to 3540
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 23
58 to 59
Strength to Weight: Bending, points 21
47 to 48
Thermal Diffusivity, mm2/s 3.8
2.9
Thermal Shock Resistance, points 21
68 to 69

Alloy Composition


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Aluminum (Al), % 0
5.5 to 6.5
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 0.13
Ruthenium (Ru), % 0
0.080 to 0.14
Silicon (Si), % 0 to 1.5
0
Titanium (Ti), % 0
88 to 90.9
Vanadium (V), % 0
3.5 to 4.5
Residuals, % 0
0 to 0.4