Materials / Compare
Stainless 303 vs. Titanium
Compare Stainless 303 vs. Titanium strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 275MPasourceOutokumpu typical (product P = hot rolled plate, transverse) | 885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset |
| Ultimate tensile strength | 585MPasourceOutokumpu typical | 940MPasourcetypical, plate, annealed |
| Elongation at break | 35%sourceOutokumpu typical, A5 | 16%sourcetypical, in 2 in., plate annealed |
| Young's modulus (stiffness) | 200GPasourceat RT (Table 12) | 107–122GPasourcetypical range, 20 °C |
| Density | 7,900kg/m³sourceat RT | 4,430kg/m³sourcenominal |
| Strength to weight | 34.8kN·m/kg | 200kN·m/kg5.74x higher |
| Stiffness to weight | 25.3MN·m/kg | 25.8MN·m/kg2% higher |
| Poisson's ratio | 0.3sourcedesign value (structural stainless steels) | 0.342sourcemean of TIMET measurements |
| Shear modulus | 76.9GPa1.8x stiffer in shear | 42.7GPa |
| Bulk modulus | 167GPa | 121GPa |
| Speed of sound | 5,032m/s | 5,084m/s |
| Thermal | ||
| Thermal conductivity | 15W/m·Ksourceat RT | 6.6W/m·Ksourcetypical, 20 °C, mill annealed |
| Thermal expansion | 16µm/m·Ksourcemean, 20–100 °C | 9µm/m·Ksourcetypical, mean 0-100 °C |
| 100 mm part over a 50 °C swing | 80µm growth | 45µm growth1.78x less |
| Specific heat | 500J/kg·Ksourceat RT | 580J/kg·Ksourcetypical, 20 °C |
| Heats up and cools (diffusivity) | 3.8mm²/s48% faster | 2.57mm²/s |
| Thermal shock resistance | 902W/m | 3,730W/m4.13x more resistant |
| Melting point | not sourced | 1,630–1,650°Csourcemelting range |
| Max service temperature | 871°Csourcecontinuous, scaling limit | 400°Csourceupper recommended use temperature |
| Values for | 1.4305 / UNS S30300, Outokumpu typical values (hot rolled, solution annealed) from 'Steel Grades, Properties and Global Standards'; max service from Carpenter CarTech 303 datasheet | TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Stainless 303 stronger than Titanium?
Titanium is stronger: its yield strength is 885 MPa against 275 MPa for Stainless 303 (3.22x).
Which is lighter, Stainless 303 or Titanium?
Titanium is lighter: 4,430 kg/m³ against 7,900 kg/m³ for Stainless 303.
Which is stiffer, Stainless 303 or Titanium?
Stainless 303 is stiffer: Young's modulus 200 GPa against 115 GPa for Titanium, so the same part in Stainless 303 deflects less under the same load.
Which is lighter for the same job, Stainless 303 or Titanium?
For the same stiffness or strength: Titanium is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Stainless 303 | Titanium |
|---|---|---|
| Stiff rod or tie (tension) | 2% heavier | lighter |
| Stiff beam (bending) | 35% heavier | lighter |
| Stiff panel or plate | 48% heavier | lighter |
| Strong rod or tie | 5.74x heavier | lighter |
| Strong beam | 3.89x heavier | lighter |
| Strong panel or plate | 3.2x heavier | lighter |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Stainless 303 or Titanium?
Stainless 303 conducts heat better: 15 W/m·K against 6.6 W/m·K for Titanium.
Which expands less with temperature?
Titanium expands less: 9 µm/m·K against 16 µm/m·K for Stainless 303.