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Grade 27 Titanium vs. Grade 37 Titanium

Both grade 27 titanium and grade 37 titanium are titanium alloys. Both are furnished in the annealed condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is grade 27 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, % 27
22
Fatigue Strength, MPa 170
170
Poisson's Ratio 0.32
0.32
Reduction in Area, % 34
34
Shear Modulus, GPa 41
40
Shear Strength, MPa 180
240
Tensile Strength: Ultimate (UTS), MPa 270
390
Tensile Strength: Yield (Proof), MPa 230
250

Thermal Properties

Latent Heat of Fusion, J/g 420
420
Maximum Temperature: Mechanical, °C 320
310
Melting Completion (Liquidus), °C 1660
1650
Melting Onset (Solidus), °C 1610
1600
Specific Heat Capacity, J/kg-K 540
550
Thermal Conductivity, W/m-K 21
21
Thermal Expansion, µm/m-K 8.7
8.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
6.8

Otherwise Unclassified Properties

Base Metal Price, % relative 37
36
Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 33
31
Embodied Energy, MJ/kg 530
500
Embodied Water, L/kg 320
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
76
Resilience: Unit (Modulus of Resilience), kJ/m3 240
280
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 17
24
Strength to Weight: Bending, points 21
26
Thermal Diffusivity, mm2/s 8.8
8.4
Thermal Shock Resistance, points 21
29

Alloy Composition

Aluminum (Al), % 0
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), % 0 to 0.2
0 to 0.3
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0 to 0.18
0 to 0.25
Ruthenium (Ru), % 0.080 to 0.14
0
Titanium (Ti), % 99 to 99.92
96.9 to 99
Residuals, % 0
0 to 0.4