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Grade 38 Titanium vs. Grade 18 Titanium

Both grade 38 titanium and grade 18 titanium are titanium alloys. They have a very high 97% 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 38 titanium and the bottom bar is grade 18 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11
11 to 17
Fatigue Strength, MPa 530
330 to 480
Poisson's Ratio 0.32
0.32
Reduction in Area, % 29
23
Shear Modulus, GPa 40
40
Shear Strength, MPa 600
420 to 590
Tensile Strength: Ultimate (UTS), MPa 1000
690 to 980
Tensile Strength: Yield (Proof), MPa 910
540 to 810

Thermal Properties

Latent Heat of Fusion, J/g 410
410
Maximum Temperature: Mechanical, °C 330
330
Melting Completion (Liquidus), °C 1620
1640
Melting Onset (Solidus), °C 1570
1590
Specific Heat Capacity, J/kg-K 550
550
Thermal Conductivity, W/m-K 8.0
8.3
Thermal Expansion, µm/m-K 9.3
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
1.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.7

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 35
41
Embodied Energy, MJ/kg 560
670
Embodied Water, L/kg 160
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
87 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 3840
1380 to 3110
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 62
43 to 61
Strength to Weight: Bending, points 49
39 to 49
Thermal Diffusivity, mm2/s 3.2
3.4
Thermal Shock Resistance, points 72
47 to 67

Alloy Composition

Aluminum (Al), % 3.5 to 4.5
2.5 to 3.5
Carbon (C), % 0 to 0.080
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 1.2 to 1.8
0 to 0.25
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0.2 to 0.3
0 to 0.15
Palladium (Pd), % 0
0.040 to 0.080
Titanium (Ti), % 89.9 to 93.1
92.5 to 95.5
Vanadium (V), % 2.0 to 3.0
2.0 to 3.0
Residuals, % 0 to 0.4
0 to 0.4