Grade 21 Titanium vs. Nickel 690
Grade 21 titanium belongs to the titanium alloys classification, while nickel 690 belongs to the nickel alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is grade 21 titanium and the bottom bar is nickel 690.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 200 |
| Elongation at Break, % | 9.0 to 17 | |
| 3.4 to 34 |
| Fatigue Strength, MPa | 550 to 660 | |
| 180 to 300 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 51 | |
| 79 |
| Shear Strength, MPa | 550 to 790 | |
| 420 to 570 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 640 to 990 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 250 to 760 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 320 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 1010 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1380 |
| Melting Onset (Solidus), °C | 1690 | |
| 1340 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 470 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 14 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 50 |
| Density, g/cm3 | 5.4 | |
| 8.3 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 8.2 |
| Embodied Energy, MJ/kg | 490 | |
| 120 |
| Embodied Water, L/kg | 180 | |
| 290 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 31 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 160 to 1440 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 32 | |
| 24 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 21 to 33 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 20 to 27 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 3.5 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 16 to 25 |
Alloy Composition
| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.050 |
| Chromium (Cr), % | 0 | |
| 27 to 31 |
| Copper (Cu), % | 0 | |
| 0 to 0.5 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 7.0 to 11 |
| Manganese (Mn), % | 0 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 14 to 16 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 58 to 66 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |