Grade 31 Titanium vs. AISI 384 Stainless Steel
Grade 31 titanium belongs to the titanium alloys classification, while AISI 384 stainless steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is grade 31 titanium and the bottom bar is AISI 384 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 200 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 41 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 510 | |
| 480 |
Thermal Properties
| Latent Heat of Fusion, J/g | 420 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 320 | |
| 910 |
| Melting Completion (Liquidus), °C | 1660 | |
| 1420 |
| Melting Onset (Solidus), °C | 1610 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 540 | |
| 480 |
| Thermal Conductivity, W/m-K | 21 | |
| 16 |
| Thermal Expansion, µm/m-K | 8.7 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 3.4 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 6.9 | |
| 2.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 36 | |
| 3.7 |
| Embodied Energy, MJ/kg | 600 | |
| 52 |
| Embodied Water, L/kg | 230 | |
| 150 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 35 | |
| 24 |
| Strength to Weight: Axial, points | 32 | |
| 17 |
| Strength to Weight: Bending, points | 32 | |
| 17 |
| Thermal Diffusivity, mm2/s | 8.5 | |
| 4.3 |
| Thermal Shock Resistance, points | 39 | |
| 11 |
Alloy Composition
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| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.040 |
| Chromium (Cr), % | 0 | |
| 15 to 17 |
| Cobalt (Co), % | 0.2 to 0.8 | |
| 0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 60.9 to 68 |
| Manganese (Mn), % | 0 | |
| 0 to 2.0 |
| Nickel (Ni), % | 0 | |
| 17 to 19 |
| Nitrogen (N), % | 0 to 0.050 | |
| 0 |
| Oxygen (O), % | 0 to 0.35 | |
| 0 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 97.9 to 99.76 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |