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Grade 18 Titanium vs. R30075 Cobalt

Grade 18 titanium belongs to the titanium alloys classification, while R30075 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is grade 18 titanium and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210 to 250
Elongation at Break, % 11 to 17
12
Fatigue Strength, MPa 330 to 480
250 to 840
Poisson's Ratio 0.32
0.29
Reduction in Area, % 23
20
Shear Modulus, GPa 40
82 to 98
Tensile Strength: Ultimate (UTS), MPa 690 to 980
780 to 1280
Tensile Strength: Yield (Proof), MPa 540 to 810
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 1640
1360
Melting Onset (Solidus), °C 1590
1290
Specific Heat Capacity, J/kg-K 550
450
Thermal Conductivity, W/m-K 8.3
13
Thermal Expansion, µm/m-K 9.9
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.1

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
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 110
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3110
560 to 1410
Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 35
24 to 25
Strength to Weight: Axial, points 43 to 61
26 to 42
Strength to Weight: Bending, points 39 to 49
22 to 31
Thermal Diffusivity, mm2/s 3.4
3.5
Thermal Shock Resistance, points 47 to 67
21 to 29

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0 to 0.080
0 to 0.35
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
58.7 to 68
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.030
0 to 0.25
Oxygen (O), % 0 to 0.15
0
Palladium (Pd), % 0.040 to 0.080
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 92.5 to 95.5
0 to 0.1
Tungsten (W), % 0
0 to 0.2
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0

Comparable Variants