EN AW-7475
EN AW-7475High-purity damage-tolerant Al-Zn-Mg-Cu alloy — controlled Fe+Si (<0.22% total) for maximum fracture toughness. T7351: UTS 490-530 MPa with KIc ~33 MPa√m (vs ~26 for 7075-T6). THE alloy for fatigue-critical fuselage skins where crack growth rate matters most. Used for lower wing skins, fuselage skins of wide-body aircraft (Boeing 747/777), and any primary structure requiring damage tolerance.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AA | USA | AA 7475 / UNS A97475 | A97475 | REF |
| 🇪🇺 | EN | Europe | EN AW-7475 / AlZn5.5MgCu | EN AW-7475 | 100% |
Sources: AA, EN 573-3
Chemical composition comparison (wt%)
Side-by-side: EN AW-7475 (EN) (EN 573-3) vs EN AW-7475 / AlZn5.5MgCu (EN) (EN 573-3)
| Element | EN AW-7475 (EN) | EN AW-7475 / AlZn5.5MgCu (EN) | Overlap |
|---|---|---|---|
| Si | 0–0.1% | 0–0.1% | OK |
| Cr | 0.18–0.25% | 0.18–0.25% | OK |
| Cu | 1.2–1.9% | 1.2–1.9% | OK |
| Al | — | — | — |
| Zn | 5.2–6.2% | 5.2–6.2% | OK |
| Mg | 1.9–2.6% | 1.9–2.6% | OK |
| Fe | 0–0.12% | 0–0.12% | OK |
Mechanical properties
T7351
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 490–530 | MPa |
| Yield Strength | 415–460 | MPa |
| Elongation | 8–11 | % |
| Elastic Modulus | ≥ 72 | GPa |
| Density | ≥ 2.81 | g/cm3 |
Compatibility verdict
EN AW-7475 and EN AW-7475 / AlZn5.5MgCu: 100% composition match
Close equivalents but NOT identical.
Related materials
EN AW-6082
3.2315High-strength structural aluminium alloy in the Al-Mg-Si family. One of the strongest 6xxx series alloys due to manganese addition. Replaced 6061 in many European applications. Used for trusses, bridges, cranes, transport, scaffolding, and marine applications. Heat treatable (T6/T651).
EN AW-5083
3.3547The highest-strength non-heat-treatable aluminium alloy. Excellent corrosion resistance (especially seawater), good weldability. Standard alloy for shipbuilding, offshore, pressure vessels, cryogenic applications, and armour plate. Not for continuous service above 65°C under stress (SCC risk).
EN AW-2024
3.1355Classic 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.
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