AISI 440B Stainless Steel vs. Grade 21 Titanium
AISI 440B stainless steel 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 AISI 440B stainless steel and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 140 |
| Elongation at Break, % | 3.0 to 18 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 260 to 850 | |
| 550 to 660 |
| Poisson's Ratio | 0.28 | |
| 0.32 |
| Shear Modulus, GPa | 77 | |
| 51 |
| Shear Strength, MPa | 460 to 1110 | |
| 550 to 790 |
| Tensile Strength: Ultimate (UTS), MPa | 740 to 1930 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 430 to 1860 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 870 | |
| 310 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1740 |
| Melting Onset (Solidus), °C | 1370 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 500 |
| Thermal Conductivity, W/m-K | 23 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 10 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.0 | |
| 60 |
| Density, g/cm3 | 7.7 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 32 |
| Embodied Energy, MJ/kg | 31 | |
| 490 |
| Embodied Water, L/kg | 120 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 to 110 | |
| 110 to 180 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 32 |
| Strength to Weight: Axial, points | 27 to 70 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 24 to 45 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 6.1 | |
| 2.8 |
| Thermal Shock Resistance, points | 27 to 70 | |
| 66 to 100 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0.75 to 1.0 | |
| 0 to 0.050 |
| Chromium (Cr), % | 16 to 18 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 78.2 to 83.3 | |
| 0 to 0.4 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 0 to 0.75 | |
| 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 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.25 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 76 to 81.2 |
| Residuals, % | 0 | |
| 0 to 0.4 |