Grade 21 Titanium vs. Nickel 625
Grade 21 titanium belongs to the titanium alloys classification, while nickel 625 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 625.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 200 |
| Elongation at Break, % | 9.0 to 17 | |
| 33 to 34 |
| Fatigue Strength, MPa | 550 to 660 | |
| 240 to 320 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 51 | |
| 79 |
| Shear Strength, MPa | 550 to 790 | |
| 530 to 600 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 790 to 910 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 320 to 450 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 330 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 980 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1350 |
| Melting Onset (Solidus), °C | 1690 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 440 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 11 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 80 |
| Density, g/cm3 | 5.4 | |
| 8.6 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 14 |
| Embodied Energy, MJ/kg | 490 | |
| 190 |
| Embodied Water, L/kg | 180 | |
| 290 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 220 to 250 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 260 to 490 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 32 | |
| 23 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 26 to 29 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 22 to 24 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 2.9 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 22 to 25 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 to 0.4 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.1 |
| Chromium (Cr), % | 0 | |
| 20 to 23 |
| Cobalt (Co), % | 0 | |
| 0 to 1.0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 14 to 16 | |
| 8.0 to 10 |
| Nickel (Ni), % | 0 | |
| 58 to 68.9 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 3.2 to 4.2 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| 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 to 0.4 |
| Residuals, % | 0 to 0.4 | |
| 0 |