Materials / Compare
Stainless 303 vs. Titanium Ti-6Al-4V
Compare Stainless 303 vs. Titanium Ti-6Al-4V 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 Ti-6Al-4V?
Titanium Ti-6Al-4V is stronger: its yield strength is 885 MPa against 275 MPa for Stainless 303 (3.22x).
Which is lighter, Stainless 303 or Titanium Ti-6Al-4V?
Titanium Ti-6Al-4V is lighter: 4,430 kg/m³ against 7,900 kg/m³ for Stainless 303.
Which is stiffer, Stainless 303 or Titanium Ti-6Al-4V?
Stainless 303 is stiffer: Young's modulus 200 GPa against 115 GPa for Titanium Ti-6Al-4V, so the same part in Stainless 303 deflects less under the same load.
Which is lighter for the same job, Stainless 303 or Titanium Ti-6Al-4V?
For the same stiffness or strength: Titanium Ti-6Al-4V 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 Ti-6Al-4V |
|---|---|---|
| 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 Ti-6Al-4V?
Stainless 303 conducts heat better: 15 W/m·K against 6.6 W/m·K for Titanium Ti-6Al-4V.
Which expands less with temperature?
Titanium Ti-6Al-4V expands less: 9 µm/m·K against 16 µm/m·K for Stainless 303.