AISI 317 Stainless Steel vs. Grade 21 Titanium
AISI 317 stainless steel belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 28 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 317 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, % | 35 to 55 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 250 to 330 | |
| 550 to 660 |
| Poisson's Ratio | 0.28 | |
| 0.32 |
| Shear Modulus, GPa | 79 | |
| 51 |
| Shear Strength, MPa | 420 to 470 | |
| 550 to 790 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 710 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 250 to 420 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 590 | |
| 310 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1740 |
| Melting Onset (Solidus), °C | 1380 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 500 |
| Thermal Conductivity, W/m-K | 15 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 17 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 21 | |
| 60 |
| Density, g/cm3 | 7.9 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 4.3 | |
| 32 |
| Embodied Energy, MJ/kg | 59 | |
| 490 |
| Embodied Water, L/kg | 160 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 210 to 260 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 to 430 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 32 |
| Strength to Weight: Axial, points | 20 to 25 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 4.1 | |
| 2.8 |
| Thermal Shock Resistance, points | 12 to 15 | |
| 66 to 100 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.050 |
| Chromium (Cr), % | 18 to 20 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 58 to 68 | |
| 0 to 0.4 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 3.0 to 4.0 | |
| 14 to 16 |
| Nickel (Ni), % | 11 to 15 | |
| 0 |
| Niobium (Nb), % | 0 | |
| 2.2 to 3.2 |
| Nitrogen (N), % | 0 to 0.1 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.17 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 |
| Silicon (Si), % | 0 to 0.75 | |
| 0.15 to 0.25 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 76 to 81.2 |
| Residuals, % | 0 | |
| 0 to 0.4 |