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Grade 7 Titanium vs. Grade 27 Titanium

Both grade 7 titanium and grade 27 titanium are titanium alloys. Both are furnished in the annealed condition. Their average alloy composition is basically identical. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is grade 7 titanium and the bottom bar is grade 27 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 24
27
Fatigue Strength, MPa 250
170
Poisson's Ratio 0.32
0.32
Reduction in Area, % 34
34
Shear Modulus, GPa 38
41
Shear Strength, MPa 270
180
Tensile Strength: Ultimate (UTS), MPa 420
270
Tensile Strength: Yield (Proof), MPa 340
230

Thermal Properties

Latent Heat of Fusion, J/g 420
420
Maximum Temperature: Mechanical, °C 320
320
Melting Completion (Liquidus), °C 1660
1660
Melting Onset (Solidus), °C 1610
1610
Specific Heat Capacity, J/kg-K 540
540
Thermal Conductivity, W/m-K 22
21
Thermal Expansion, µm/m-K 9.2
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 7.2
7.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 47
33
Embodied Energy, MJ/kg 800
530
Embodied Water, L/kg 470
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
70
Resilience: Unit (Modulus of Resilience), kJ/m3 560
240
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 26
17
Strength to Weight: Bending, points 28
21
Thermal Diffusivity, mm2/s 8.9
8.8
Thermal Shock Resistance, points 31
21

Alloy Composition


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Carbon (C), % 0 to 0.080
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.3
0 to 0.2
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0 to 0.25
0 to 0.18
Palladium (Pd), % 0.12 to 0.25
0
Ruthenium (Ru), % 0
0.080 to 0.14
Titanium (Ti), % 98.7 to 99.88
99 to 99.92
Residuals, % 0 to 0.4
0 to 0.4