Grade 21 Titanium vs. ASTM B817 Type I
Both grade 21 titanium and ASTM B817 type I are titanium alloys. They have 82% 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 grade 21 titanium and the bottom bar is ASTM B817 type I.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 100 |
| Elongation at Break, % | 9.0 to 17 | |
| 4.0 to 13 |
| Fatigue Strength, MPa | 550 to 660 | |
| 360 to 520 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Reduction in Area, % | 22 | |
| 5.0 to 29 |
| Shear Modulus, GPa | 51 | |
| 40 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 770 to 960 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 700 to 860 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 340 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1600 |
| Melting Onset (Solidus), °C | 1690 | |
| 1550 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 560 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 7.1 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 9.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 36 |
| Density, g/cm3 | 5.4 | |
| 4.4 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 38 |
| Embodied Energy, MJ/kg | 490 | |
| 610 |
| Embodied Water, L/kg | 180 | |
| 200 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 30 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 2310 to 3540 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 32 | |
| 35 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 48 to 60 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 42 to 49 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 2.9 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 54 to 68 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 5.5 to 6.8 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.1 |
| Chlorine (Cl), % | 0 | |
| 0 to 0.2 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.4 | |
| 0 to 0.4 |
| Molybdenum (Mo), % | 14 to 16 | |
| 0 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 to 0.040 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 to 0.3 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 0 to 0.1 |
| Sodium (Na), % | 0 | |
| 0 to 0.2 |
| Titanium (Ti), % | 76 to 81.2 | |
| 87 to 91 |
| Vanadium (V), % | 0 | |
| 3.5 to 4.5 |
| Residuals, % | 0 to 0.4 | |
| 0 to 0.4 |