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