Grade 31 Titanium vs. AISI 321 Stainless Steel
Grade 31 titanium belongs to the titanium alloys classification, while AISI 321 stainless steel belongs to the iron alloys. There are 29 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 31 titanium and the bottom bar is AISI 321 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 200 |
| Elongation at Break, % | 20 | |
| 34 to 50 |
| Fatigue Strength, MPa | 300 | |
| 220 to 270 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 41 | |
| 77 |
| Shear Strength, MPa | 320 | |
| 420 to 460 |
| Tensile Strength: Ultimate (UTS), MPa | 510 | |
| 590 to 690 |
| Tensile Strength: Yield (Proof), MPa | 450 | |
| 220 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 420 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 320 | |
| 870 |
| Melting Completion (Liquidus), °C | 1660 | |
| 1430 |
| Melting Onset (Solidus), °C | 1610 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 540 | |
| 480 |
| Thermal Conductivity, W/m-K | 21 | |
| 16 |
| Thermal Expansion, µm/m-K | 8.7 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 3.4 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 6.9 | |
| 2.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 36 | |
| 3.2 |
| Embodied Energy, MJ/kg | 600 | |
| 45 |
| Embodied Water, L/kg | 230 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 99 | |
| 190 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 940 | |
| 130 to 310 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 35 | |
| 25 |
| Strength to Weight: Axial, points | 32 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 32 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 8.5 | |
| 4.1 |
| Thermal Shock Resistance, points | 39 | |
| 13 to 15 |
Alloy Composition
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.080 |
| Chromium (Cr), % | 0 | |
| 17 to 19 |
| Cobalt (Co), % | 0.2 to 0.8 | |
| 0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 65.3 to 74 |
| Manganese (Mn), % | 0 | |
| 0 to 2.0 |
| Nickel (Ni), % | 0 | |
| 9.0 to 12 |
| Nitrogen (N), % | 0 to 0.050 | |
| 0 to 0.1 |
| 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 0.75 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 97.9 to 99.76 | |
| 0 to 0.7 |
| Residuals, % | 0 to 0.4 | |
| 0 |