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