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Aluminum 2024-T351 vs. DMLS 17-4PH Stainless Steel
Compare Aluminum 2024-T351 vs. DMLS 17-4PH Stainless Steel strength, stiffness, weight and thermal properties.
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|---|---|---|
| Mechanical | ||
| Yield strength | 324MPasourcetypical, 0.2% offset, .500 in dia specimen | 861MPasourcemean, as built, horizontal (N=72) |
| Ultimate tensile strength | 469MPasourcetypical | 886MPasourcemean, as built, horizontal (N=72) |
| Elongation at break | 19%sourcetypical, in 4D | 19.9%sourcemean at break, as built, horizontal |
| Young's modulus (stiffness) | 73.1GPasourcetypical | 197GPasourcebase material: wrought 17-4 PH, Condition H 900 (Cleveland-Cliffs) |
| Density | 2,770kg/m³sourcenominal | 7,790kg/m³sourcemean part density (ISO 3369) |
| Strength to weight | 117kN·m/kg6% higher | 110kN·m/kg |
| Stiffness to weight | 26.4MN·m/kg4% higher | 25.3MN·m/kg |
| Poisson's ratio | 0.33sourcetypical (handbook physical constant), all tempers | 0.272sourcebase material: wrought 17-4 PH, all conditions (Cleveland-Cliffs) |
| Shear modulus | 27.5GPa | 77.4GPa2.82x stiffer in shear |
| Bulk modulus | 71.7GPa | 144GPa |
| Speed of sound | 5,137m/s | 5,029m/s |
| Thermal | ||
| Thermal conductivity | 120W/m·Ksourcetypical, 20 °C | 17.9W/m·Ksourcebase material: wrought 17-4 PH, Condition H 900, at 149 °C (Cleveland-Cliffs) |
| Thermal expansion | 22.9µm/m·Ksourcetypical, mean 20-100 °C | 10.4µm/m·Ksourcemean 25-100 °C, ASTM E228, AFTER atmospheric heat treatment (as-built value not published) |
| 100 mm part over a 50 °C swing | 115µm growth | 52µm growth2.2x less |
| Specific heat | 875J/kg·Ksourcetypical, at 100 °C | 460J/kg·Ksourcebase material: wrought 17-4 PH, Condition A, 0-100 °C (Cleveland-Cliffs) |
| Heats up and cools (diffusivity) | 49.5mm²/s9.91x faster | 5mm²/s |
| Thermal shock resistance | 15,561W/m2.84x more resistant | 5,474W/m |
| Melting point | 502–638°Csourcemelting range | not sourced |
| Values for | 2024-T4/T351, Kaiser Aluminum sheet, coil & plate typical datasheet; Poisson from MIL-HDBK-5J | EOS StainlessSteel 17-4PH IndustryLine (powder 9011-0041), EOS M 290, 40 µm, default job 17-4PH_040_StainlessM291_100, as built, horizontal; ISO 6892 & ASTM E8M |
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.
DMLS 17-4PH Stainless Steel is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Aluminum 2024-T351 stronger than DMLS 17-4PH Stainless Steel?
DMLS 17-4PH Stainless Steel is stronger: its yield strength is 861 MPa against 324 MPa for Aluminum 2024-T351 (2.66x).
Which is lighter, Aluminum 2024-T351 or DMLS 17-4PH Stainless Steel?
Aluminum 2024-T351 is lighter: 2,770 kg/m³ against 7,790 kg/m³ for DMLS 17-4PH Stainless Steel.
Which is stiffer, Aluminum 2024-T351 or DMLS 17-4PH Stainless Steel?
DMLS 17-4PH Stainless Steel is stiffer: Young's modulus 197 GPa against 73.1 GPa for Aluminum 2024-T351, so the same part in DMLS 17-4PH Stainless Steel deflects less under the same load.
Which is lighter for the same job, Aluminum 2024-T351 or DMLS 17-4PH Stainless Steel?
For the same stiffness or strength: Aluminum 2024-T351 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 | Aluminum 2024-T351 | DMLS 17-4PH Stainless Steel |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 4% heavier |
| Stiff beam (bending) | lighter | 1.71x heavier |
| Stiff panel or plate | lighter | 2.02x heavier |
| Strong rod or tie | lighter | 6% heavier |
| Strong beam | lighter | 47% heavier |
| Strong panel or plate | lighter | 1.73x 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 2024-T351 or DMLS 17-4PH Stainless Steel?
Aluminum 2024-T351 conducts heat better: 120 W/m·K against 17.9 W/m·K for DMLS 17-4PH Stainless Steel.
Which expands less with temperature?
DMLS 17-4PH Stainless Steel expands less: 10.4 µm/m·K against 22.9 µm/m·K for Aluminum 2024-T351.
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