ASTM B817 Type I vs. Grade 18 Titanium
Both ASTM B817 type I and grade 18 titanium are titanium alloys. They have a moderately high 95% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (2, 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 18 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 110 |
| Elongation at Break, % | 4.0 to 13 | |
| 11 to 17 |
| Fatigue Strength, MPa | 360 to 520 | |
| 330 to 480 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Reduction in Area, % | 5.0 to 29 | |
| 23 |
| Shear Modulus, GPa | 40 | |
| 40 |
| Tensile Strength: Ultimate (UTS), MPa | 770 to 960 | |
| 690 to 980 |
| Tensile Strength: Yield (Proof), MPa | 700 to 860 | |
| 540 to 810 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 340 | |
| 330 |
| Melting Completion (Liquidus), °C | 1600 | |
| 1640 |
| Melting Onset (Solidus), °C | 1550 | |
| 1590 |
| Specific Heat Capacity, J/kg-K | 560 | |
| 550 |
| Thermal Conductivity, W/m-K | 7.1 | |
| 8.3 |
| Thermal Expansion, µm/m-K | 9.6 | |
| 9.9 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.0 | |
| 1.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.0 | |
| 2.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.4 | |
| 4.5 |
| Embodied Carbon, kg CO2/kg material | 38 | |
| 41 |
| Embodied Energy, MJ/kg | 610 | |
| 670 |
| Embodied Water, L/kg | 200 | |
| 270 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 30 to 120 | |
| 87 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2310 to 3540 | |
| 1380 to 3110 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 35 | |
| 35 |
| Strength to Weight: Axial, points | 48 to 60 | |
| 43 to 61 |
| Strength to Weight: Bending, points | 42 to 49 | |
| 39 to 49 |
| Thermal Diffusivity, mm2/s | 2.9 | |
| 3.4 |
| Thermal Shock Resistance, points | 54 to 68 | |
| 47 to 67 |
Alloy Composition
| Aluminum (Al), % | 5.5 to 6.8 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0 to 0.1 | |
| 0 to 0.080 |
| 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 0.25 |
| Nitrogen (N), % | 0 to 0.040 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 to 0.3 | |
| 0 to 0.15 |
| Palladium (Pd), % | 0 | |
| 0.040 to 0.080 |
| Silicon (Si), % | 0 to 0.1 | |
| 0 |
| Sodium (Na), % | 0 to 0.2 | |
| 0 |
| Titanium (Ti), % | 87 to 91 | |
| 92.5 to 95.5 |
| Vanadium (V), % | 3.5 to 4.5 | |
| 2.0 to 3.0 |
| Residuals, % | 0 | |
| 0 to 0.4 |