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Grade 18 Titanium vs. AWS ERTi-5

Both grade 18 titanium and AWS ERTi-5 are titanium alloys. They have a very high 95% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is grade 18 titanium and the bottom bar is AWS ERTi-5.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11 to 17
10
Fatigue Strength, MPa 330 to 480
470
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 40
40
Tensile Strength: Ultimate (UTS), MPa 690 to 980
900
Tensile Strength: Yield (Proof), MPa 540 to 810
830

Thermal Properties

Latent Heat of Fusion, J/g 410
410
Maximum Temperature: Mechanical, °C 330
340
Melting Completion (Liquidus), °C 1640
1610
Melting Onset (Solidus), °C 1590
1560
Specific Heat Capacity, J/kg-K 550
560
Thermal Conductivity, W/m-K 8.3
7.1
Thermal Expansion, µm/m-K 9.9
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.0

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.4
Embodied Carbon, kg CO2/kg material 41
38
Embodied Energy, MJ/kg 670
610
Embodied Water, L/kg 270
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 110
87
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3110
3250
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 43 to 61
56
Strength to Weight: Bending, points 39 to 49
46
Thermal Diffusivity, mm2/s 3.4
2.9
Thermal Shock Resistance, points 47 to 67
63

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
5.5 to 6.8
Carbon (C), % 0 to 0.080
0 to 0.050
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.25
0 to 0.22
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0 to 0.15
0.12 to 0.2
Palladium (Pd), % 0.040 to 0.080
0
Titanium (Ti), % 92.5 to 95.5
88.2 to 90.9
Vanadium (V), % 2.0 to 3.0
3.5 to 4.5
Residuals, % 0 to 0.4
0