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Grade 35 Titanium vs. Grade 38 Titanium

Both grade 35 titanium and grade 38 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 35 titanium and the bottom bar is grade 38 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Aluminum (Al), % 4.0 to 5.0
3.5 to 4.5
Carbon (C), % 0 to 0.080
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0.2 to 0.8
1.2 to 1.8
Molybdenum (Mo), % 1.5 to 2.5
0
Nitrogen (N), % 0 to 0.050
0 to 0.030
Oxygen (O), % 0 to 0.25
0.2 to 0.3
Silicon (Si), % 0.2 to 0.4
0
Titanium (Ti), % 88.4 to 93
89.9 to 93.1
Vanadium (V), % 1.1 to 2.1
2.0 to 3.0
Residuals, % 0 to 0.4
0 to 0.4