Titanium 6-6-2 vs. Grade 21 Titanium
Both titanium 6-6-2 and grade 21 titanium are titanium alloys. They have 88% of their average alloy composition in common. 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 titanium 6-6-2 and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 140 |
| Elongation at Break, % | 6.7 to 9.0 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 590 to 670 | |
| 550 to 660 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Reduction in Area, % | 17 to 23 | |
| 22 |
| Shear Modulus, GPa | 44 | |
| 51 |
| Shear Strength, MPa | 670 to 800 | |
| 550 to 790 |
| Tensile Strength: Ultimate (UTS), MPa | 1140 to 1370 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 1040 to 1230 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 310 |
| Melting Completion (Liquidus), °C | 1610 | |
| 1740 |
| Melting Onset (Solidus), °C | 1560 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 540 | |
| 500 |
| Thermal Conductivity, W/m-K | 5.5 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 9.4 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 40 | |
| 60 |
| Density, g/cm3 | 4.8 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 29 | |
| 32 |
| Embodied Energy, MJ/kg | 470 | |
| 490 |
| Embodied Water, L/kg | 200 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 89 to 99 | |
| 110 to 180 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 34 | |
| 32 |
| Strength to Weight: Axial, points | 66 to 79 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 50 to 57 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 2.1 | |
| 2.8 |
| Thermal Shock Resistance, points | 75 to 90 | |
| 66 to 100 |
Alloy Composition
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| Aluminum (Al), % | 5.0 to 6.0 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.050 |
| Copper (Cu), % | 0.35 to 1.0 | |
| 0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 to 0.015 |
| Iron (Fe), % | 0.35 to 1.0 | |
| 0 to 0.4 |
| Molybdenum (Mo), % | 5.0 to 6.0 | |
| 14 to 16 |
| Niobium (Nb), % | 0 | |
| 2.2 to 3.2 |
| Nitrogen (N), % | 0 to 0.040 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 to 0.2 | |
| 0 to 0.17 |
| Silicon (Si), % | 0 | |
| 0.15 to 0.25 |
| Tin (Sn), % | 1.5 to 2.5 | |
| 0 |
| Titanium (Ti), % | 82.8 to 87.8 | |
| 76 to 81.2 |
| Residuals, % | 0 to 0.4 | |
| 0 to 0.4 |