Grade 18 Titanium vs. AISI 440C Stainless Steel
Grade 18 titanium belongs to the titanium alloys classification, while AISI 440C stainless steel belongs to the iron alloys. There are 28 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 grade 18 titanium and the bottom bar is AISI 440C stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 200 |
| Elongation at Break, % | 11 to 17 | |
| 2.0 to 14 |
| Fatigue Strength, MPa | 330 to 480 | |
| 260 to 840 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 40 | |
| 76 |
| Shear Strength, MPa | 420 to 590 | |
| 430 to 1120 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 980 | |
| 710 to 1970 |
| Tensile Strength: Yield (Proof), MPa | 540 to 810 | |
| 450 to 1900 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 870 |
| Melting Completion (Liquidus), °C | 1640 | |
| 1480 |
| Melting Onset (Solidus), °C | 1590 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 480 |
| Thermal Conductivity, W/m-K | 8.3 | |
| 22 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 10 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.3 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 2.8 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 41 | |
| 2.2 |
| Embodied Energy, MJ/kg | 670 | |
| 31 |
| Embodied Water, L/kg | 270 | |
| 120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 110 | |
| 39 to 88 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 35 | |
| 25 |
| Strength to Weight: Axial, points | 43 to 61 | |
| 26 to 71 |
| Strength to Weight: Bending, points | 39 to 49 | |
| 23 to 46 |
| Thermal Diffusivity, mm2/s | 3.4 | |
| 6.0 |
| Thermal Shock Resistance, points | 47 to 67 | |
| 26 to 71 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Carbon (C), % | 0 to 0.080 | |
| 1.0 to 1.2 |
| Chromium (Cr), % | 0 | |
| 16 to 18 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.25 | |
| 78 to 83.1 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.75 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.15 | |
| 0 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Titanium (Ti), % | 92.5 to 95.5 | |
| 0 |
| Vanadium (V), % | 2.0 to 3.0 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |