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Grade 33 Titanium vs. R30816 Cobalt

Grade 33 titanium belongs to the titanium alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is grade 33 titanium and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210
Elongation at Break, % 23
23
Fatigue Strength, MPa 250
250
Poisson's Ratio 0.32
0.3
Reduction in Area, % 34
22
Shear Modulus, GPa 41
81
Tensile Strength: Ultimate (UTS), MPa 390
1020
Tensile Strength: Yield (Proof), MPa 350
460

Thermal Properties

Latent Heat of Fusion, J/g 420
300
Melting Completion (Liquidus), °C 1660
1540
Melting Onset (Solidus), °C 1610
1460
Specific Heat Capacity, J/kg-K 540
420
Thermal Conductivity, W/m-K 21
13
Thermal Expansion, µm/m-K 8.7
12

Otherwise Unclassified Properties

Density, g/cm3 4.5
9.1
Embodied Carbon, kg CO2/kg material 33
20
Embodied Energy, MJ/kg 530
320
Embodied Water, L/kg 200
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86
190
Resilience: Unit (Modulus of Resilience), kJ/m3 590
510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
22
Strength to Weight: Axial, points 24
31
Strength to Weight: Bending, points 26
25
Thermal Diffusivity, mm2/s 8.7
3.3
Thermal Shock Resistance, points 30
28

Alloy Composition

Carbon (C), % 0 to 0.080
0.32 to 0.42
Chromium (Cr), % 0.1 to 0.2
19 to 21
Cobalt (Co), % 0
40 to 49.8
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.3
0 to 5.0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0.35 to 0.55
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.25
0
Palladium (Pd), % 0.010 to 0.020
0
Phosphorus (P), % 0
0 to 0.040
Ruthenium (Ru), % 0.020 to 0.040
0
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 98.1 to 99.52
0
Tungsten (W), % 0
3.5 to 4.5
Residuals, % 0 to 0.4
0