EN AW-5083
3.3547The highest-strength non-heat-treatable aluminum alloy. Al-Mg4.5-Mn with outstanding seawater and industrial chemical resistance. Retains exceptional strength after welding (unlike 6xxx/7xxx). ASTM B928 certified for marine service. THE shipbuilding aluminum — also used for rail cars, pressure vessels, cryogenic tanks, truck bodies, and LNG applications. Available O, H111, H116, H321 tempers.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AA | USA | AA 5083 / UNS A95083 | A95083 | REF |
| 🇪🇺 | EN | Europe | EN AW-5083 (AlMg4.5Mn0.7) | 3.3547 | 100% |
| 🇬🇧 | BS | United Kingdom | BS N8 | — | 95% |
Sources: ASTM B209, EN 485-2, BS
Chemical composition comparison (wt%)
Side-by-side: EN AW-5083 (AA) (EN 573-3) vs BS N8 (BS)
| Element | EN AW-5083 (AA) | BS N8 (BS) | Overlap |
|---|---|---|---|
| Si | 0–0.4% | — | — |
| Mn | 0.4–1% | — | — |
| Cr | 0.05–0.25% | — | — |
| Cu | 0–0.1% | — | — |
| Al | — | — | — |
| Ti | 0–0.15% | — | — |
| Mg | 4–4.9% | — | — |
| Fe | 0–0.4% | — | — |
| Zn | 0–0.25% | — | — |
Mechanical properties
O
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 270–345 | MPa |
| Yield Strength | 115–130 | MPa |
| Elongation | ≥ 16 | % |
| Elastic Modulus | ≥ 72 | GPa |
| Density | ≥ 2.66 | g/cm3 |
H321
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 305–380 | MPa |
| Yield Strength | 215–230 | MPa |
| Elongation | ≥ 10 | % |
Compatibility verdict
EN AW-5083 and BS N8: 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.
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