Grade 21 Titanium vs. AISI 440C Stainless Steel
Grade 21 titanium belongs to the titanium alloys classification, while AISI 440C stainless steel 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 AISI 440C stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 200 |
| Elongation at Break, % | 9.0 to 17 | |
| 2.0 to 14 |
| Fatigue Strength, MPa | 550 to 660 | |
| 260 to 840 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 51 | |
| 76 |
| Shear Strength, MPa | 550 to 790 | |
| 430 to 1120 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 710 to 1970 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 450 to 1900 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 870 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1480 |
| Melting Onset (Solidus), °C | 1690 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 480 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 22 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 9.0 |
| Density, g/cm3 | 5.4 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 2.2 |
| Embodied Energy, MJ/kg | 490 | |
| 31 |
| Embodied Water, L/kg | 180 | |
| 120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 39 to 88 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 32 | |
| 25 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 26 to 71 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 23 to 46 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 6.0 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 26 to 71 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Carbon (C), % | 0 to 0.050 | |
| 1.0 to 1.2 |
| Chromium (Cr), % | 0 | |
| 16 to 18 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 78 to 83.1 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 14 to 16 | |
| 0 to 0.75 |
| 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 0.040 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |