Grade 21 Titanium vs. Grey Cast Iron
Grade 21 titanium belongs to the titanium alloys classification, while grey cast iron belongs to the iron alloys. There are 27 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 21 titanium and the bottom bar is grey cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 180 |
| Elongation at Break, % | 9.0 to 17 | |
| 9.6 |
| Fatigue Strength, MPa | 550 to 660 | |
| 69 to 170 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 51 | |
| 69 |
| Shear Strength, MPa | 550 to 790 | |
| 180 to 610 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 160 to 450 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 98 to 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 280 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1380 |
| Melting Onset (Solidus), °C | 1690 | |
| 1180 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 490 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 46 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 1.9 |
| Density, g/cm3 | 5.4 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 1.5 |
| Embodied Energy, MJ/kg | 490 | |
| 21 |
| Embodied Water, L/kg | 180 | |
| 44 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 13 to 37 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 27 to 240 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 32 | |
| 25 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 5.8 to 17 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 8.7 to 17 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 13 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 6.0 to 17 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 3.1 to 3.4 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 92.1 to 93.9 |
| Manganese (Mn), % | 0 | |
| 0.5 to 0.7 |
| Molybdenum (Mo), % | 14 to 16 | |
| 0 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.9 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 2.5 to 2.8 |
| Sulfur (S), % | 0 | |
| 0 to 0.15 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |