EN AW-2017A vs EN AW-2024: Both Cu-series duralumin alloys — 2024 is the modern successor
EN AW-2017A vs EN AW-2024
Side-by-side chemical composition and mechanical property comparison.
Overview
EN AW-2017A
3.1325
The original "Duralumin" — historically the first high-strength aluminium alloy. Cu-Mg composition with natural aging (T4). Good machinability and moderate strength. Largely superseded by 2024 and 7xxx alloys for aerospace, but still widely used for screw-machine parts, hydraulic fittings, and structural rivets.
EN AW-2024
3.1355
Classic high-strength aerospace aluminium alloy (Al-Cu-Mg). Excellent fatigue resistance — the standard choice for aircraft fuselage skins and wing tension members. Poor corrosion resistance and weldability. Often supplied with Alclad cladding for corrosion protection. In use since 1931.
| EN AW-2017A | EN AW-2024 | |
|---|---|---|
| Material Number | 3.1325 | 3.1355 |
| Category | Aluminum | Aluminum |
| Standard | EN 573-3 | EN 573-3 |
Chemical composition (wt%)
| Element | EN AW-2017A | EN AW-2024 | Overlap |
|---|---|---|---|
| Si | 0.2–0.8% | 0–0.5% | Partial |
| Mn | 0.4–1% | 0.3–0.9% | Partial |
| Cr | 0–0.1% | 0–0.1% | OK |
| Cu | 3.5–4.5% | 3.8–4.9% | Partial |
Mechanical properties
| Property | EN AW-2017A | EN AW-2024 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 370 | 400–430 | MPa |
| yield_strength | ≥ 220 | 270–280 | MPa |
| elongation | ≥ 12 | ≥ 10 | % |
Compatibility Assessment
2024 has more Cu (3.8-4.9% vs 3.5-4.5%) and Mg (1.2-1.8% vs 0.4-1.0%) for ~20% higher strength. 2017A has better machinability and natural aging response. Choose 2024 for aerospace structures; 2017A for screw-machine parts and rivets.
Frequently Asked Questions
Is EN AW-2017A the same as EN AW-2024?
EN AW-2017A and EN AW-2024 have a 70% composition overlap. Both Cu-series duralumin alloys — 2024 is the modern successor
Can I replace EN AW-2017A with EN AW-2024?
In many cases, yes. The compositions overlap significantly (70%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between EN AW-2017A and EN AW-2024?
The main differences are in the following elements: Si, Mn, Cu, Mg. EN AW-2017A is a Aluminum grade, while EN AW-2024 is a Aluminum grade.
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