Grade 18 Titanium vs. Grade 20 Titanium
Both grade 18 titanium and grade 20 titanium are titanium alloys. They have 80% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is grade 18 titanium and the bottom bar is grade 20 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 120 |
| Elongation at Break, % | 11 to 17 | |
| 5.7 to 17 |
| Fatigue Strength, MPa | 330 to 480 | |
| 550 to 630 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Reduction in Area, % | 23 | |
| 23 |
| Shear Modulus, GPa | 40 | |
| 47 |
| Shear Strength, MPa | 420 to 590 | |
| 560 to 740 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 980 | |
| 900 to 1270 |
| Tensile Strength: Yield (Proof), MPa | 540 to 810 | |
| 850 to 1190 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 370 |
| Melting Completion (Liquidus), °C | 1640 | |
| 1660 |
| Melting Onset (Solidus), °C | 1590 | |
| 1600 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 520 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 9.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 5.0 |
| Embodied Carbon, kg CO2/kg material | 41 | |
| 52 |
| Embodied Energy, MJ/kg | 670 | |
| 860 |
| Embodied Water, L/kg | 270 | |
| 350 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 110 | |
| 71 to 150 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1380 to 3110 | |
| 2940 to 5760 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 35 | |
| 33 |
| Strength to Weight: Axial, points | 43 to 61 | |
| 50 to 70 |
| Strength to Weight: Bending, points | 39 to 49 | |
| 41 to 52 |
| Thermal Shock Resistance, points | 47 to 67 | |
| 55 to 77 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 3.0 to 4.0 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.050 |
| Chromium (Cr), % | 0 | |
| 5.5 to 6.5 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 to 0.020 |
| Iron (Fe), % | 0 to 0.25 | |
| 0 to 0.3 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 4.5 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 to 0.15 | |
| 0 to 0.12 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0.040 to 0.080 |
| Titanium (Ti), % | 92.5 to 95.5 | |
| 71 to 77 |
| Vanadium (V), % | 2.0 to 3.0 | |
| 7.5 to 8.5 |
| Zirconium (Zr), % | 0 | |
| 3.5 to 4.5 |
| Residuals, % | 0 to 0.4 | |
| 0 to 0.4 |