Materials / Compare
Aluminum 7050-T7451 vs. Stainless 303
Compare Aluminum 7050-T7451 vs. Stainless 303 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 | 469MPasourcetypical, longitudinal, 0.2% offset | 275MPasourceOutokumpu typical (product P = hot rolled plate, transverse) |
| Ultimate tensile strength | 524MPasourcetypical, longitudinal | 585MPasourceOutokumpu typical |
| Elongation at break | 11%sourcetypical, longitudinal | 35%sourceOutokumpu typical, A5 |
| Young's modulus (stiffness) | 70.3GPasourcetypical | 200GPasourceat RT (Table 12) |
| Density | 2,830kg/m³sourcenominal | 7,900kg/m³sourceat RT |
| Strength to weight | 166kN·m/kg4.76x higher | 34.8kN·m/kg |
| Stiffness to weight | 24.8MN·m/kg | 25.3MN·m/kg2% higher |
| Poisson's ratio | 0.33sourcetypical (handbook physical constant) | 0.3sourcedesign value (structural stainless steels) |
| Shear modulus | 26.4GPa | 76.9GPa2.91x stiffer in shear |
| Bulk modulus | 68.9GPa | 167GPa |
| Speed of sound | 4,984m/s | 5,032m/s |
| Thermal | ||
| Thermal conductivity | 157W/m·Ksourcetypical, 20 °C | 15W/m·Ksourceat RT |
| Thermal expansion | 23.5µm/m·Ksourcetypical, mean 20-100 °C | 16µm/m·Ksourcemean, 20–100 °C |
| 100 mm part over a 50 °C swing | 118µm growth | 80µm growth47% less |
| Specific heat | 860J/kg·Ksourcetypical, at 100 °C | 500J/kg·Ksourceat RT |
| Heats up and cools (diffusivity) | 64.5mm²/s17x faster | 3.8mm²/s |
| Thermal shock resistance | 29,862W/m33.1x more resistant | 902W/m |
| Melting point | 524–635°Csourcemelting range | not sourced |
| Max service temperature | not sourced | 871°Csourcecontinuous, scaling limit |
| Values for | 7050-T7451 plate, Kaiser Aluminum sheet, coil & plate typical datasheet (longitudinal); Poisson from MIL-HDBK-5J | 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 |
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 Aluminum 7050-T7451 stronger than Stainless 303?
Aluminum 7050-T7451 is stronger: its yield strength is 469 MPa against 275 MPa for Stainless 303 (1.71x).
Which is lighter, Aluminum 7050-T7451 or Stainless 303?
Aluminum 7050-T7451 is lighter: 2,830 kg/m³ against 7,900 kg/m³ for Stainless 303.
Which is stiffer, Aluminum 7050-T7451 or Stainless 303?
Stainless 303 is stiffer: Young's modulus 200 GPa against 70.3 GPa for Aluminum 7050-T7451, so the same part in Stainless 303 deflects less under the same load.
Which is lighter for the same job, Aluminum 7050-T7451 or Stainless 303?
For the same stiffness or strength: Aluminum 7050-T7451 is lighter for a stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate; Stainless 303 is lighter for a stiff rod or tie (tension).
| Part that must be | Aluminum 7050-T7451 | Stainless 303 |
|---|---|---|
| Stiff rod or tie (tension) | 2% heavier | lighter |
| Stiff beam (bending) | lighter | 1.66x heavier |
| Stiff panel or plate | lighter | 1.97x heavier |
| Strong rod or tie | lighter | 4.76x heavier |
| Strong beam | lighter | 3.98x heavier |
| Strong panel or plate | lighter | 3.65x heavier |
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, Aluminum 7050-T7451 or Stainless 303?
Aluminum 7050-T7451 conducts heat better: 157 W/m·K against 15 W/m·K for Stainless 303.
Which expands less with temperature?
Stainless 303 expands less: 16 µm/m·K against 23.5 µm/m·K for Aluminum 7050-T7451.