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Grade C-6 Titanium vs. R30021 Cobalt

Grade C-6 titanium belongs to the titanium alloys classification, while R30021 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 C-6 titanium and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
220
Elongation at Break, % 9.0
9.0
Fatigue Strength, MPa 460
250
Poisson's Ratio 0.32
0.29
Rockwell C Hardness 32
32
Shear Modulus, GPa 39
86
Tensile Strength: Ultimate (UTS), MPa 890
700
Tensile Strength: Yield (Proof), MPa 830
500

Thermal Properties

Latent Heat of Fusion, J/g 410
330
Melting Completion (Liquidus), °C 1580
1350
Melting Onset (Solidus), °C 1530
1190
Specific Heat Capacity, J/kg-K 550
450
Thermal Conductivity, W/m-K 7.8
15
Thermal Expansion, µm/m-K 9.8
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.4
Embodied Carbon, kg CO2/kg material 30
8.0
Embodied Energy, MJ/kg 480
110
Embodied Water, L/kg 190
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78
57
Resilience: Unit (Modulus of Resilience), kJ/m3 3300
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 55
23
Strength to Weight: Bending, points 46
21
Thermal Diffusivity, mm2/s 3.2
3.8
Thermal Shock Resistance, points 63
21

Alloy Composition

Aluminum (Al), % 4.0 to 6.0
0
Carbon (C), % 0 to 0.1
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.5
0 to 3.0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.050
2.0 to 3.0
Oxygen (O), % 0 to 0.2
0
Silicon (Si), % 0
0 to 1.5
Tin (Sn), % 2.0 to 3.0
0
Titanium (Ti), % 89.7 to 94
0
Residuals, % 0 to 0.4
0