EN AW-7075
3.4365THE aerospace aluminum — Al-Zn5.6-Mg-Cu precipitation-hardened to the highest strength of any common aluminum alloy. T6 strength rivaling mild steel at 1/3 the density. Poor weldability and corrosion resistance vs 5xxx/6xxx. Used for aircraft wing skins, fuselage frames, high-stress structural components, and competitive cycling/climbing equipment. Often Alclad for corrosion protection.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AA | USA | AA 7075 / UNS A97075 | A97075 | REF |
| 🇪🇺 | EN | Europe | EN AW-7075 (AlZn5.5MgCu) | 3.4365 | 100% |
| 🇯🇵 | JIS | Japan | A7075 | — | 100% |
Sources: ASTM B209, EN 485-2, JIS H4000
Chemical composition comparison (wt%)
Side-by-side: EN AW-7075 (AA) (EN 573-3) vs EN AW-7075 (AlZn5.5MgCu) (EN)
| Element | EN AW-7075 (AA) | EN AW-7075 (AlZn5.5MgCu) (EN) | Overlap |
|---|---|---|---|
| Si | 0–0.4% | — | — |
| Mn | 0–0.3% | — | — |
| Cr | 0.18–0.28% | — | — |
| Cu | 1.2–2% | — | — |
| Al | — | — | — |
| Ti | 0–0.2% | — | — |
| Zn | 5.1–6.1% | — | — |
| Mg | 2.1–2.9% | — | — |
| Fe | 0–0.5% | — | — |
Mechanical properties
T6 (solution treated + artificially aged)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 540–570 | MPa |
| Yield Strength | 470–505 | MPa |
| Elongation | 7–11 | % |
| Hardness HB | 140–160 | HB |
| Elastic Modulus | ≥ 72 | GPa |
| Density | ≥ 2.81 | g/cm3 |
T73
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 475–505 | MPa |
| Yield Strength | 390–420 | MPa |
| Elongation | 7–11 | % |
Compatibility verdict
EN AW-7075 and EN AW-7075 (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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