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Grade 38 Titanium vs. R31538 Cobalt

Grade 38 titanium belongs to the titanium alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 28 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 R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 11
13 to 23
Fatigue Strength, MPa 530
310 to 480
Poisson's Ratio 0.32
0.29
Reduction in Area, % 29
13 to 22
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 1000
1020 to 1360
Tensile Strength: Yield (Proof), MPa 910
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 1620
1360
Melting Onset (Solidus), °C 1570
1290
Specific Heat Capacity, J/kg-K 550
450
Thermal Conductivity, W/m-K 8.0
13
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
8.4
Embodied Carbon, kg CO2/kg material 35
8.1
Embodied Energy, MJ/kg 560
110
Embodied Water, L/kg 160
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 3840
750 to 1920
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 62
34 to 45
Strength to Weight: Bending, points 49
27 to 32
Thermal Diffusivity, mm2/s 3.2
3.5
Thermal Shock Resistance, points 72
25 to 33

Alloy Composition


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Aluminum (Al), % 3.5 to 4.5
0
Carbon (C), % 0 to 0.080
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 1.2 to 1.8
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0 to 0.030
0 to 0.25
Oxygen (O), % 0.2 to 0.3
0
Silicon (Si), % 0
0 to 1.0
Titanium (Ti), % 89.9 to 93.1
0
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0