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Grade 38 Titanium vs. R31233 Cobalt

Grade 38 titanium belongs to the titanium alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is grade 38 titanium and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 11
17
Fatigue Strength, MPa 530
220
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
85
Tensile Strength: Ultimate (UTS), MPa 1000
1020
Tensile Strength: Yield (Proof), MPa 910
420

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 1620
1350
Melting Onset (Solidus), °C 1570
1330
Specific Heat Capacity, J/kg-K 550
440
Thermal Conductivity, W/m-K 8.0
12
Thermal Expansion, µm/m-K 9.3
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.6
Embodied Carbon, kg CO2/kg material 35
8.4
Embodied Energy, MJ/kg 560
110
Embodied Water, L/kg 160
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
140
Resilience: Unit (Modulus of Resilience), kJ/m3 3840
410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
23
Strength to Weight: Axial, points 62
33
Strength to Weight: Bending, points 49
26
Thermal Diffusivity, mm2/s 3.2
3.2
Thermal Shock Resistance, points 72
25

Alloy Composition


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Aluminum (Al), % 3.5 to 4.5
0
Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.080
0.020 to 0.1
Chromium (Cr), % 0
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 1.2 to 1.8
1.0 to 5.0
Manganese (Mn), % 0
0.1 to 1.5
Molybdenum (Mo), % 0
4.0 to 6.0
Nickel (Ni), % 0
7.0 to 11
Nitrogen (N), % 0 to 0.030
0.030 to 0.12
Oxygen (O), % 0.2 to 0.3
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0
0.050 to 1.0
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 89.9 to 93.1
0
Tungsten (W), % 0
1.0 to 3.0
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0