EN AW-7075
3.4365The classic high-strength aerospace aluminium alloy. Al-Zn-Mg-Cu composition provides the highest strength of all common aluminium alloys in T6 temper. Poor weldability and limited corrosion resistance. Used for aircraft structures, M16 rifle receivers, rock climbing gear, and precision mold plates.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AA | USA | AA 7075 | A97075 | REF |
| 🇪🇺 | EN | Europe | EN AW-7075 / AlZn5.5MgCu | 3.4365 | 100% |
| 🇯🇵 | JIS | Japan | A7075 | — | 98% |
| 🇫🇷 | AFNOR | France | A-Z5GU | — | 98% |
| 🇬🇧 | BS | United Kingdom | 2L95 (old) | — | 95% |
Sources: ASTM B209, EN 573-3, JIS H4000, NF EN 573-3, BS L
Chemical composition comparison (wt%)
Side-by-side: EN AW-7075 (EN) (EN 573-3) vs A7075 (JIS)
| Element | EN AW-7075 (EN) | A7075 (JIS) | Overlap |
|---|---|---|---|
| Si | 0–0.4% | — | — |
| Mn | 0–0.3% | — | — |
| Cr | 0.18–0.28% | — | — |
| Cu | 1.2–2% | — | — |
| Ti | 0–0.2% | — | — |
| Fe | 0–0.5% | — | — |
| Mg | 2.1–2.9% | — | — |
| Zn | 5.1–6.1% | — | — |
Mechanical properties
T6 (solution treated + artificially aged)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 540 | MPa |
| Yield Strength | ≥ 470 | MPa |
| Elongation | ≥ 7 | % |
| Hardness HB | 150–170 | HB |
| Elastic Modulus | ≥ 72 | GPa |
| Density | ≥ 2.8 | g/cm3 |
T651
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 570 | MPa |
| Yield Strength | ≥ 500 | MPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 460–490 °C | water | 30-120 min | Rapid water quench required |
| artificial_aging | 115–125 °C | air | 24 hours | T6 temper: 120°C for 24h. Peak strength. |
| overaging | 100–180 °C | air | 24+ hours | T73 temper: Two-step aging for improved SCC resistance at lower strength |
Compatibility verdict
EN AW-7075 and A7075: 98% 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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