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Grade 18 Titanium vs. Grade 35 Titanium

Both grade 18 titanium and grade 35 titanium are titanium alloys. They have a very high 96% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is grade 18 titanium and the bottom bar is grade 35 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11 to 17
5.6
Fatigue Strength, MPa 330 to 480
330
Poisson's Ratio 0.32
0.32
Reduction in Area, % 23
23
Shear Modulus, GPa 40
41
Shear Strength, MPa 420 to 590
580
Tensile Strength: Ultimate (UTS), MPa 690 to 980
1000
Tensile Strength: Yield (Proof), MPa 540 to 810
630

Thermal Properties

Latent Heat of Fusion, J/g 410
420
Maximum Temperature: Mechanical, °C 330
320
Melting Completion (Liquidus), °C 1640
1630
Melting Onset (Solidus), °C 1590
1580
Specific Heat Capacity, J/kg-K 550
550
Thermal Conductivity, W/m-K 8.3
7.4
Thermal Expansion, µm/m-K 9.9
9.3

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
1.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.2

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.6
Embodied Carbon, kg CO2/kg material 41
33
Embodied Energy, MJ/kg 670
530
Embodied Water, L/kg 270
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 110
49
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3110
1830
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 43 to 61
61
Strength to Weight: Bending, points 39 to 49
49
Thermal Diffusivity, mm2/s 3.4
3.0
Thermal Shock Resistance, points 47 to 67
70

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
4.0 to 5.0
Carbon (C), % 0 to 0.080
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.25
0.2 to 0.8
Molybdenum (Mo), % 0
1.5 to 2.5
Nitrogen (N), % 0 to 0.030
0 to 0.050
Oxygen (O), % 0 to 0.15
0 to 0.25
Palladium (Pd), % 0.040 to 0.080
0
Silicon (Si), % 0
0.2 to 0.4
Titanium (Ti), % 92.5 to 95.5
88.4 to 93
Vanadium (V), % 2.0 to 3.0
1.1 to 2.1
Residuals, % 0 to 0.4
0 to 0.4