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R31538 Cobalt vs. Grade 37 Titanium

R31538 cobalt belongs to the cobalt alloys classification, while grade 37 titanium belongs to the titanium 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 R31538 cobalt and the bottom bar is grade 37 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Elongation at Break, % 13 to 23
22
Fatigue Strength, MPa 310 to 480
170
Poisson's Ratio 0.29
0.32
Reduction in Area, % 13 to 22
34
Shear Modulus, GPa 86
40
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
390
Tensile Strength: Yield (Proof), MPa 580 to 930
250

Thermal Properties

Latent Heat of Fusion, J/g 320
420
Melting Completion (Liquidus), °C 1360
1650
Melting Onset (Solidus), °C 1290
1600
Specific Heat Capacity, J/kg-K 450
550
Thermal Conductivity, W/m-K 13
21
Thermal Expansion, µm/m-K 13
8.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
6.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
4.5
Embodied Carbon, kg CO2/kg material 8.1
31
Embodied Energy, MJ/kg 110
500
Embodied Water, L/kg 530
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
76
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
280
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 34 to 45
24
Strength to Weight: Bending, points 27 to 32
26
Thermal Diffusivity, mm2/s 3.5
8.4
Thermal Shock Resistance, points 25 to 33
29

Alloy Composition

Aluminum (Al), % 0
1.0 to 2.0
Carbon (C), % 0.15 to 0.35
0 to 0.080
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.75
0 to 0.3
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Silicon (Si), % 0 to 1.0
0
Titanium (Ti), % 0
96.9 to 99
Residuals, % 0
0 to 0.4