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Grade 11 Titanium vs. Grade 7 Titanium

Both grade 11 titanium and grade 7 titanium are titanium alloys. Both are furnished in the annealed condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is grade 11 titanium and the bottom bar is grade 7 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
150
Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 29
24
Fatigue Strength, MPa 170
250
Poisson's Ratio 0.32
0.32
Reduction in Area, % 37
34
Shear Modulus, GPa 38
38
Shear Strength, MPa 200
270
Tensile Strength: Ultimate (UTS), MPa 310
420
Tensile Strength: Yield (Proof), MPa 230
340

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
22
Thermal Expansion, µm/m-K 9.2
9.2

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.7
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 7.3
7.2

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 81
95
Resilience: Unit (Modulus of Resilience), kJ/m3 240
560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 19
26
Strength to Weight: Bending, points 22
28
Thermal Diffusivity, mm2/s 8.9
8.9
Thermal Shock Resistance, points 22
31

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 0.2
0 to 0.3
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0 to 0.18
0 to 0.25
Palladium (Pd), % 0.12 to 0.25
0.12 to 0.25
Titanium (Ti), % 98.8 to 99.88
98.7 to 99.88
Residuals, % 0 to 0.4
0 to 0.4