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Grade 18 Titanium vs. R30008 Cobalt

Grade 18 titanium belongs to the titanium alloys classification, while R30008 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is grade 18 titanium and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210
Elongation at Break, % 11 to 17
1.1 to 73
Fatigue Strength, MPa 330 to 480
320 to 530
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
83
Tensile Strength: Ultimate (UTS), MPa 690 to 980
950 to 1700
Tensile Strength: Yield (Proof), MPa 540 to 810
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 1640
1400
Melting Onset (Solidus), °C 1590
1330
Specific Heat Capacity, J/kg-K 550
450
Thermal Expansion, µm/m-K 9.9
13

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.4
Embodied Carbon, kg CO2/kg material 41
8.1
Embodied Energy, MJ/kg 670
110
Embodied Water, L/kg 270
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3110
590 to 2720
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 43 to 61
31 to 56
Strength to Weight: Bending, points 39 to 49
25 to 37
Thermal Shock Resistance, points 47 to 67
25 to 44

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
0
Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.080
0 to 0.15
Chromium (Cr), % 0
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
7.6 to 20
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
6.5 to 7.5
Nickel (Ni), % 0
15 to 18
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.15
0
Palladium (Pd), % 0.040 to 0.080
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0 to 1.2
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 92.5 to 95.5
0
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0

Comparable Variants