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Grade 38 Titanium vs. Grade 35 Titanium

Both grade 38 titanium and grade 35 titanium are titanium alloys. Both are furnished in the annealed condition. 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 35 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11
5.6
Fatigue Strength, MPa 530
330
Poisson's Ratio 0.32
0.32
Reduction in Area, % 29
23
Shear Modulus, GPa 40
41
Shear Strength, MPa 600
580
Tensile Strength: Ultimate (UTS), MPa 1000
1000
Tensile Strength: Yield (Proof), MPa 910
630

Thermal Properties

Latent Heat of Fusion, J/g 410
420
Maximum Temperature: Mechanical, °C 330
320
Melting Completion (Liquidus), °C 1620
1630
Melting Onset (Solidus), °C 1570
1580
Specific Heat Capacity, J/kg-K 550
550
Thermal Conductivity, W/m-K 8.0
7.4
Thermal Expansion, µm/m-K 9.3
9.3

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
1.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 36
37
Density, g/cm3 4.5
4.6
Embodied Carbon, kg CO2/kg material 35
33
Embodied Energy, MJ/kg 560
530
Embodied Water, L/kg 160
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
49
Resilience: Unit (Modulus of Resilience), kJ/m3 3840
1830
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 62
61
Strength to Weight: Bending, points 49
49
Thermal Diffusivity, mm2/s 3.2
3.0
Thermal Shock Resistance, points 72
70

Alloy Composition

Aluminum (Al), % 3.5 to 4.5
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), % 1.2 to 1.8
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), % 0.2 to 0.3
0 to 0.25
Silicon (Si), % 0
0.2 to 0.4
Titanium (Ti), % 89.9 to 93.1
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