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Grade 7 Titanium vs. AWS ERTi-7

Both grade 7 titanium and AWS ERTi-7 are titanium alloys. Their average alloy composition is basically identical. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 24
20
Fatigue Strength, MPa 250
190
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 38
40
Tensile Strength: Ultimate (UTS), MPa 420
340
Tensile Strength: Yield (Proof), MPa 340
280

Thermal Properties

Latent Heat of Fusion, J/g 420
420
Maximum Temperature: Mechanical, °C 320
320
Melting Completion (Liquidus), °C 1660
1670
Melting Onset (Solidus), °C 1610
1620
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
7.3

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 95
64
Resilience: Unit (Modulus of Resilience), kJ/m3 560
360
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 26
21
Strength to Weight: Bending, points 28
24
Thermal Diffusivity, mm2/s 8.9
8.8
Thermal Shock Resistance, points 31
26

Alloy Composition


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Carbon (C), % 0 to 0.080
0 to 0.030
Hydrogen (H), % 0 to 0.015
0 to 0.0080
Iron (Fe), % 0 to 0.3
0 to 0.12
Nitrogen (N), % 0 to 0.030
0 to 0.015
Oxygen (O), % 0 to 0.25
0.080 to 0.16
Palladium (Pd), % 0.12 to 0.25
0.12 to 0.25
Titanium (Ti), % 98.7 to 99.88
99.417 to 99.8
Residuals, % 0 to 0.4
0