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Grade 7 Titanium vs. Grade 3 Titanium

Both grade 7 titanium and grade 3 titanium are titanium alloys. Both are furnished in the annealed condition. Their average alloy composition is basically identical. There are 31 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 3 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
170
Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 24
21
Fatigue Strength, MPa 250
300
Poisson's Ratio 0.32
0.32
Reduction in Area, % 34
34
Shear Modulus, GPa 38
39
Shear Strength, MPa 270
320
Tensile Strength: Ultimate (UTS), MPa 420
510
Tensile Strength: Yield (Proof), MPa 340
440

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
9.2

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
3.3
Electrical Conductivity: Equal Weight (Specific), % IACS 7.2
6.6

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 47
31
Embodied Energy, MJ/kg 800
510
Embodied Water, L/kg 470
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
100
Resilience: Unit (Modulus of Resilience), kJ/m3 560
910
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 26
32
Strength to Weight: Bending, points 28
32
Thermal Diffusivity, mm2/s 8.9
8.6
Thermal Shock Resistance, points 31
37

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 0.3
Nitrogen (N), % 0 to 0.030
0 to 0.050
Oxygen (O), % 0 to 0.25
0 to 0.35
Palladium (Pd), % 0.12 to 0.25
0
Titanium (Ti), % 98.7 to 99.88
98.8 to 100
Residuals, % 0 to 0.4
0 to 0.4