AISI 440B Stainless Steel vs. Grade 18 Titanium
AISI 440B stainless steel belongs to the iron alloys classification, while grade 18 titanium belongs to the titanium 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 AISI 440B stainless steel and the bottom bar is grade 18 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 110 |
| Elongation at Break, % | 3.0 to 18 | |
| 11 to 17 |
| Fatigue Strength, MPa | 260 to 850 | |
| 330 to 480 |
| Poisson's Ratio | 0.28 | |
| 0.32 |
| Shear Modulus, GPa | 77 | |
| 40 |
| Shear Strength, MPa | 460 to 1110 | |
| 420 to 590 |
| Tensile Strength: Ultimate (UTS), MPa | 740 to 1930 | |
| 690 to 980 |
| Tensile Strength: Yield (Proof), MPa | 430 to 1860 | |
| 540 to 810 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 870 | |
| 330 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1640 |
| Melting Onset (Solidus), °C | 1370 | |
| 1590 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 550 |
| Thermal Conductivity, W/m-K | 23 | |
| 8.3 |
| Thermal Expansion, µm/m-K | 10 | |
| 9.9 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 1.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 2.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.7 | |
| 4.5 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 41 |
| Embodied Energy, MJ/kg | 31 | |
| 670 |
| Embodied Water, L/kg | 120 | |
| 270 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 to 110 | |
| 87 to 110 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 35 |
| Strength to Weight: Axial, points | 27 to 70 | |
| 43 to 61 |
| Strength to Weight: Bending, points | 24 to 45 | |
| 39 to 49 |
| Thermal Diffusivity, mm2/s | 6.1 | |
| 3.4 |
| Thermal Shock Resistance, points | 27 to 70 | |
| 47 to 67 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0.75 to 1.0 | |
| 0 to 0.080 |
| Chromium (Cr), % | 16 to 18 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 78.2 to 83.3 | |
| 0 to 0.25 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 0 to 0.75 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.15 |
| Palladium (Pd), % | 0 | |
| 0.040 to 0.080 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 92.5 to 95.5 |
| Vanadium (V), % | 0 | |
| 2.0 to 3.0 |
| Residuals, % | 0 | |
| 0 to 0.4 |