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Grade 38 Titanium vs. Grade 33 Titanium

Both grade 38 titanium and grade 33 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 33 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11
23
Fatigue Strength, MPa 530
250
Poisson's Ratio 0.32
0.32
Reduction in Area, % 29
34
Shear Modulus, GPa 40
41
Shear Strength, MPa 600
240
Tensile Strength: Ultimate (UTS), MPa 1000
390
Tensile Strength: Yield (Proof), MPa 910
350

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
55
Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 35
33
Embodied Energy, MJ/kg 560
530
Embodied Water, L/kg 160
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
86
Resilience: Unit (Modulus of Resilience), kJ/m3 3840
590
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 62
24
Strength to Weight: Bending, points 49
26
Thermal Diffusivity, mm2/s 3.2
8.7
Thermal Shock Resistance, points 72
30

Alloy Composition

Aluminum (Al), % 3.5 to 4.5
0
Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 0
0.1 to 0.2
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 1.2 to 1.8
0 to 0.3
Nickel (Ni), % 0
0.35 to 0.55
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0.2 to 0.3
0 to 0.25
Palladium (Pd), % 0
0.010 to 0.020
Ruthenium (Ru), % 0
0.020 to 0.040
Titanium (Ti), % 89.9 to 93.1
98.1 to 99.52
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0 to 0.4