ASTM B817 Type II vs. Grade 21 Titanium
Both ASTM B817 type II and grade 21 titanium are titanium alloys. They have 82% of their average alloy composition in common. There are 26 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 ASTM B817 type II and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 140 |
| Elongation at Break, % | 3.0 to 13 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 390 to 530 | |
| 550 to 660 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Reduction in Area, % | 4.0 to 13 | |
| 22 |
| Shear Modulus, GPa | 40 | |
| 51 |
| Tensile Strength: Ultimate (UTS), MPa | 900 to 960 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 780 to 900 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 350 | |
| 310 |
| Melting Completion (Liquidus), °C | 1580 | |
| 1740 |
| Melting Onset (Solidus), °C | 1530 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 500 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 37 | |
| 60 |
| Density, g/cm3 | 4.6 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 40 | |
| 32 |
| Embodied Energy, MJ/kg | 650 | |
| 490 |
| Embodied Water, L/kg | 220 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 26 to 120 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2890 to 3890 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 34 | |
| 32 |
| Strength to Weight: Axial, points | 55 to 58 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 45 to 47 | |
| 38 to 50 |
| Thermal Shock Resistance, points | 62 to 66 | |
| 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 0.1 | |
| 0 to 0.050 |
| Chlorine (Cl), % | 0 to 0.2 | |
| 0 |
| 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), % | 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 0.3 | |
| 0 to 0.17 |
| Silicon (Si), % | 0 to 0.1 | |
| 0.15 to 0.25 |
| Sodium (Na), % | 0 to 0.2 | |
| 0 |
| Tin (Sn), % | 1.5 to 2.5 | |
| 0 |
| Titanium (Ti), % | 82.1 to 87.8 | |
| 76 to 81.2 |
| Vanadium (V), % | 5.0 to 6.0 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 to 0.4 |