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Grade 38 Titanium vs. Grade 37 Titanium

Both grade 38 titanium and grade 37 titanium are titanium alloys. Both are furnished in the annealed condition. They have a moderately high 94% 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 37 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 11
22
Fatigue Strength, MPa 530
170
Poisson's Ratio 0.32
0.32
Reduction in Area, % 29
34
Shear Modulus, GPa 40
40
Shear Strength, MPa 600
240
Tensile Strength: Ultimate (UTS), MPa 1000
390
Tensile Strength: Yield (Proof), MPa 910
250

Thermal Properties

Latent Heat of Fusion, J/g 410
420
Maximum Temperature: Mechanical, °C 330
310
Melting Completion (Liquidus), °C 1620
1650
Melting Onset (Solidus), °C 1570
1600
Specific Heat Capacity, J/kg-K 550
550
Thermal Conductivity, W/m-K 8.0
21
Thermal Expansion, µm/m-K 9.3
8.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
6.8

Otherwise Unclassified Properties

Base Metal Price, % relative 36
36
Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 35
31
Embodied Energy, MJ/kg 560
500
Embodied Water, L/kg 160
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
76
Resilience: Unit (Modulus of Resilience), kJ/m3 3840
280
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
8.4
Thermal Shock Resistance, points 72
29

Alloy Composition

Aluminum (Al), % 3.5 to 4.5
1.0 to 2.0
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
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0.2 to 0.3
0 to 0.25
Titanium (Ti), % 89.9 to 93.1
96.9 to 99
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0 to 0.4