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Grade 38 Titanium vs. Grade 14 Titanium

Both grade 38 titanium and grade 14 titanium are titanium alloys. Both are furnished in the annealed condition. They have a moderately high 92% 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 14 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11
23
Fatigue Strength, MPa 530
220
Poisson's Ratio 0.32
0.32
Reduction in Area, % 29
34
Shear Modulus, GPa 40
41
Shear Strength, MPa 600
290
Tensile Strength: Ultimate (UTS), MPa 1000
460
Tensile Strength: Yield (Proof), MPa 910
310

Thermal Properties

Latent Heat of Fusion, J/g 410
420
Maximum Temperature: Mechanical, °C 330
320
Melting Completion (Liquidus), °C 1620
1660
Melting Onset (Solidus), °C 1570
1610
Specific Heat Capacity, J/kg-K 550
540
Thermal Conductivity, W/m-K 8.0
21
Thermal Expansion, µm/m-K 9.3
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
6.9

Otherwise Unclassified Properties

Base Metal Price, % relative 36
37
Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 35
32
Embodied Energy, MJ/kg 560
520
Embodied Water, L/kg 160
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
93
Resilience: Unit (Modulus of Resilience), kJ/m3 3840
450
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 62
28
Strength to Weight: Bending, points 49
29
Thermal Diffusivity, mm2/s 3.2
8.5
Thermal Shock Resistance, points 72
35

Alloy Composition

Aluminum (Al), % 3.5 to 4.5
0
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 0.3
Nickel (Ni), % 0
0.4 to 0.6
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0.2 to 0.3
0 to 0.15
Ruthenium (Ru), % 0
0.040 to 0.060
Titanium (Ti), % 89.9 to 93.1
98.4 to 99.56
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0 to 0.4