Materials / Compare
Aluminum ADC12 vs. Stainless Steel 17-4PH
Compare Aluminum ADC12 vs. Stainless Steel 17-4PH 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 | 149MPasourceone test result, 0.2% proof stress, as cast, ASTM tensile bar (Daiki) | 1,275MPasourcetypical, transverse, sheet/strip |
| Ultimate tensile strength | 345MPasourceone test result, as cast, ASTM tensile bar (Daiki) | 1,379MPasourcetypical, transverse, sheet/strip |
| Elongation at break | 2.3%sourceone test result, as cast, ASTM tensile bar (Daiki) | 9%sourcetypical, transverse, in 2 in. (50.8 mm) |
| Young's modulus (stiffness) | 79.8GPasourcestandard value (S.S.Aluminum) | 197GPasourceH 900 |
| Density | 2,680kg/m³sourcemeasured (Daiki) | 7,800kg/m³sourceH 900 |
| Strength to weight | 55.6kN·m/kg | 163kN·m/kg2.94x higher |
| Stiffness to weight | 29.8MN·m/kg18% higher | 25.3MN·m/kg |
| Poisson's ratio | not sourced | 0.272sourceH 900 (column) |
| Shear modulus | not sourced | 77.4GPa |
| Bulk modulus | not sourced | 144GPa |
| Speed of sound | 5,457m/s | 5,026m/s |
| Thermal | ||
| Thermal conductivity | 125W/m·Ksourcemeasured on specimens cut from a 50 x 100 x 5 mm flat die casting (Daiki) | 17.9W/m·Ksourceat 149 °C (300 °F), H 900 |
| Thermal expansion | 21µm/m·Ksourcemeasured, temperature range not stated (Daiki) | 10.8µm/m·Ksourcemean, 21–93 °C (70–200 °F), H 900 |
| 100 mm part over a 50 °C swing | 105µm growth | 54µm growth1.94x less |
| Specific heat | 911J/kg·Ksourcemeasured (Daiki) | 460J/kg·Ksourcemean, 0–100 °C, H 900 |
| Heats up and cools (diffusivity) | 51.2mm²/s10.3x faster | 4.99mm²/s |
| Thermal shock resistance | not sourced | 7,809W/m |
| Melting point | 515–582°Csourcesolidus-liquidus (Daiki) | not sourced |
| Max service temperature | not sourced | 316°Csourcestrength-retention limit (not oxidation) |
| Values for | JIS ADC12 (Al-Si-Cu, about A383 / EN AC-46100) high-pressure die-casting alloy, as cast; physical properties from Daiki Aluminium Industry (ADC12 ingot producer) measured values; modulus from S.S.Aluminum (ADC12 ingot producer) standard values. | Cleveland-Cliffs 17-4 PH, Condition H 900, sheet/strip, transverse (Product Data Bulletin, May 2021) |
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 ADC12 stronger than Stainless Steel 17-4PH?
Stainless Steel 17-4PH is stronger: its yield strength is 1,275 MPa against 149 MPa for Aluminum ADC12 (8.56x).
Which is lighter, Aluminum ADC12 or Stainless Steel 17-4PH?
Aluminum ADC12 is lighter: 2,680 kg/m³ against 7,800 kg/m³ for Stainless Steel 17-4PH.
Which is stiffer, Aluminum ADC12 or Stainless Steel 17-4PH?
Stainless Steel 17-4PH is stiffer: Young's modulus 197 GPa against 79.8 GPa for Aluminum ADC12, so the same part in Stainless Steel 17-4PH deflects less under the same load.
Which is lighter for the same job, Aluminum ADC12 or Stainless Steel 17-4PH?
For the same stiffness or strength: Aluminum ADC12 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; Stainless Steel 17-4PH is lighter for a strong rod or tie, strong beam.
| Part that must be | Aluminum ADC12 | Stainless Steel 17-4PH |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 18% heavier |
| Stiff beam (bending) | lighter | 1.85x heavier |
| Stiff panel or plate | lighter | 2.15x heavier |
| Strong rod or tie | 2.94x heavier | lighter |
| Strong beam | 44% heavier | lighter |
| Strong panel or plate | about equal | about equal |
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 ADC12 or Stainless Steel 17-4PH?
Aluminum ADC12 conducts heat better: 125 W/m·K against 17.9 W/m·K for Stainless Steel 17-4PH.
Which expands less with temperature?
Stainless Steel 17-4PH expands less: 10.8 µm/m·K against 21 µm/m·K for Aluminum ADC12.
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