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Grade 21 Titanium vs. R30006 Cobalt

Grade 21 titanium belongs to the titanium alloys classification, while R30006 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
220
Elongation at Break, % 9.0 to 17
1.0
Fatigue Strength, MPa 550 to 660
260
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 51
85
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
900
Tensile Strength: Yield (Proof), MPa 870 to 1170
540

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 1740
1400
Melting Onset (Solidus), °C 1690
1290
Specific Heat Capacity, J/kg-K 500
450
Thermal Conductivity, W/m-K 7.5
15
Thermal Expansion, µm/m-K 7.1
11

Otherwise Unclassified Properties

Density, g/cm3 5.4
8.6
Embodied Carbon, kg CO2/kg material 32
7.8
Embodied Energy, MJ/kg 490
110
Embodied Water, L/kg 180
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
23
Strength to Weight: Axial, points 46 to 69
29
Strength to Weight: Bending, points 38 to 50
24
Thermal Diffusivity, mm2/s 2.8
3.9
Thermal Shock Resistance, points 66 to 100
26

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.050
0.9 to 1.4
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0 to 3.0
Molybdenum (Mo), % 14 to 16
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Silicon (Si), % 0.15 to 0.25
0 to 2.0
Titanium (Ti), % 76 to 81.2
0
Tungsten (W), % 0
4.0 to 6.0
Residuals, % 0 to 0.4
0