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Grade 38 Titanium vs. Grade 9 Titanium

Both grade 38 titanium and grade 9 titanium are titanium alloys. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is grade 38 titanium and the bottom bar is grade 9 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
28
Shear Modulus, GPa 40
40
Shear Strength, MPa 600
430 to 580
Tensile Strength: Ultimate (UTS), MPa 1000
700 to 960
Tensile Strength: Yield (Proof), MPa 910
540 to 830

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
8.1
Thermal Expansion, µm/m-K 9.3
9.1

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 36
37
Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 35
36
Embodied Energy, MJ/kg 560
580
Embodied Water, L/kg 160
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
89 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 3840
1380 to 3220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 62
43 to 60
Strength to Weight: Bending, points 49
39 to 48
Thermal Diffusivity, mm2/s 3.2
3.3
Thermal Shock Resistance, points 72
52 to 71

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
Titanium (Ti), % 89.9 to 93.1
92.6 to 95.5
Vanadium (V), % 2.0 to 3.0
2.0 to 3.0
Residuals, % 0 to 0.4
0 to 0.4