Grade 18 Titanium vs. ASTM B817 Type II
Both grade 18 titanium and ASTM B817 type II are titanium alloys. They have a moderately high 91% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is grade 18 titanium and the bottom bar is ASTM B817 type II.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 100 |
| Elongation at Break, % | 11 to 17 | |
| 3.0 to 13 |
| Fatigue Strength, MPa | 330 to 480 | |
| 390 to 530 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Reduction in Area, % | 23 | |
| 4.0 to 13 |
| Shear Modulus, GPa | 40 | |
| 40 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 980 | |
| 900 to 960 |
| Tensile Strength: Yield (Proof), MPa | 540 to 810 | |
| 780 to 900 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 350 |
| Melting Completion (Liquidus), °C | 1640 | |
| 1580 |
| Melting Onset (Solidus), °C | 1590 | |
| 1530 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 550 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 9.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 4.6 |
| Embodied Carbon, kg CO2/kg material | 41 | |
| 40 |
| Embodied Energy, MJ/kg | 670 | |
| 650 |
| Embodied Water, L/kg | 270 | |
| 220 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 110 | |
| 26 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1380 to 3110 | |
| 2890 to 3890 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 35 | |
| 34 |
| Strength to Weight: Axial, points | 43 to 61 | |
| 55 to 58 |
| Strength to Weight: Bending, points | 39 to 49 | |
| 45 to 47 |
| Thermal Shock Resistance, points | 47 to 67 | |
| 62 to 66 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 5.0 to 6.0 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.1 |
| Chlorine (Cl), % | 0 | |
| 0 to 0.2 |
| Copper (Cu), % | 0 | |
| 0.35 to 1.0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.25 | |
| 0.35 to 1.0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 to 0.040 |
| Oxygen (O), % | 0 to 0.15 | |
| 0 to 0.3 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0 to 0.1 |
| Sodium (Na), % | 0 | |
| 0 to 0.2 |
| Tin (Sn), % | 0 | |
| 1.5 to 2.5 |
| Titanium (Ti), % | 92.5 to 95.5 | |
| 82.1 to 87.8 |
| Vanadium (V), % | 2.0 to 3.0 | |
| 5.0 to 6.0 |
| Residuals, % | 0 to 0.4 | |
| 0 to 0.4 |