EN AW-7020
3.4335Weldable high-strength 7xxx aluminium — unique because most 7xxx alloys have poor weldability. Low Cu content gives better SCC resistance than 7075. Good mechanical property recovery after welding. Used for railway carriages, military bridges, mobile cranes, aircraft freight containers, and structural transport components.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AA | USA | AA 7020 | A97020 | REF |
| 🇪🇺 | EN | Europe | EN AW-7020 / AlZn4.5Mg1 | 3.4335 | 100% |
| 🇬🇧 | BS | United Kingdom | H17 | — | 95% |
| 🇫🇷 | AFNOR | France | A-Z5G | — | 93% |
Sources: ASTM B221, EN 573-3, BS 1474, AFNOR
Chemical composition comparison (wt%)
Side-by-side: EN AW-7020 (EN) (EN 573-3) vs H17 (BS)
| Element | EN AW-7020 (EN) | H17 (BS) | Overlap |
|---|---|---|---|
| Si | 0–0.35% | — | — |
| Mn | 0.05–0.5% | — | — |
| Cr | 0.1–0.35% | — | — |
| Cu | 0–0.2% | — | — |
| Ti | 0–0.08% | — | — |
| Zn | 4–5% | — | — |
| Mg | 1–1.4% | — | — |
| Fe | 0–0.4% | — | — |
| Zr | 0.08–0.2% | — | — |
Mechanical properties
T6 (solution treated + artificially aged)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 350 | MPa |
| Yield Strength | ≥ 280 | MPa |
| Elongation | ≥ 10 | % |
| Elastic Modulus | ≥ 72 | GPa |
| Density | ≥ 2.78 | g/cm3 |
T5
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 310 | MPa |
| Yield Strength | ≥ 245 | MPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 470–490 °C | water | 30-60 min | T6 temper |
| aging | 115–135 °C | air | 18-24 hours | T6 artificial aging. Good property recovery after welding. |
Compatibility verdict
EN AW-7020 and H17: 95% 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.
Not sure which material fits?
🤖 Ask AI Advisor →All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.