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Grade 27 Titanium vs. R31537 Cobalt

Grade 27 titanium belongs to the titanium alloys classification, while R31537 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 27 titanium and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 27
14 to 23
Fatigue Strength, MPa 170
310 to 480
Poisson's Ratio 0.32
0.29
Reduction in Area, % 34
13 to 23
Shear Modulus, GPa 41
87
Tensile Strength: Ultimate (UTS), MPa 270
1000 to 1340
Tensile Strength: Yield (Proof), MPa 230
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 420
320
Melting Completion (Liquidus), °C 1660
1360
Melting Onset (Solidus), °C 1610
1290
Specific Heat Capacity, J/kg-K 540
450
Thermal Conductivity, W/m-K 21
13
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.4
Embodied Carbon, kg CO2/kg material 33
8.1
Embodied Energy, MJ/kg 530
110
Embodied Water, L/kg 320
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 240
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 17
33 to 44
Strength to Weight: Bending, points 21
26 to 32
Thermal Diffusivity, mm2/s 8.8
3.4
Thermal Shock Resistance, points 21
24 to 32

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.9 to 69
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
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 to 0.18
0
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0 to 1.0
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0