Nickel 718 vs. Grade 21 Titanium
Nickel 718 belongs to the nickel alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is nickel 718 and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 140 |
| Elongation at Break, % | 12 to 50 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 460 to 760 | |
| 550 to 660 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Reduction in Area, % | 34 to 64 | |
| 22 |
| Shear Modulus, GPa | 75 | |
| 51 |
| Shear Strength, MPa | 660 to 950 | |
| 550 to 790 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 310 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1740 |
| Melting Onset (Solidus), °C | 1260 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 500 |
| Thermal Conductivity, W/m-K | 11 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 13 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 60 |
| Density, g/cm3 | 8.3 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 32 |
| Embodied Energy, MJ/kg | 190 | |
| 490 |
| Embodied Water, L/kg | 250 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 390 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 32 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 2.8 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 66 to 100 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 2.5 to 3.5 |
| Boron (B), % | 0 to 0.0060 | |
| 0 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.050 |
| Chromium (Cr), % | 17 to 21 | |
| 0 |
| Cobalt (Co), % | 0 to 1.0 | |
| 0 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 0 to 0.4 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 14 to 16 |
| Nickel (Ni), % | 50 to 55 | |
| 0 |
| Niobium (Nb), % | 4.8 to 5.5 | |
| 2.2 to 3.2 |
| Nitrogen (N), % | 0 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.17 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 0.35 | |
| 0.15 to 0.25 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Titanium (Ti), % | 0.65 to 1.2 | |
| 76 to 81.2 |
| Residuals, % | 0 | |
| 0 to 0.4 |