EN AW-4047
EN AW-4047Near-eutectic Al-Si brazing alloy — Si 11-13%. Lowest melting point (~577°C eutectic) in the Al-Si system = ideal brazing filler. Superior fluidity and joint fill vs 4043 (5% Si). Used as brazing sheet clad layer and wire for CAB (Controlled Atmosphere Brazing) of heat exchangers, radiators, evaporators, and condensers. Also used for welding Al-Si castings.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AA | USA | AA 4047 / UNS A94047 | A94047 | REF |
| 🇪🇺 | EN | Europe | EN AW-4047 / AlSi12(A) | EN AW-4047 | 100% |
Sources: AA, EN 573-3
Chemical composition comparison (wt%)
Side-by-side: EN AW-4047 (EN) (EN 573-3) vs EN AW-4047 / AlSi12(A) (EN) (EN 573-3)
| Element | EN AW-4047 (EN) | EN AW-4047 / AlSi12(A) (EN) | Overlap |
|---|---|---|---|
| Si | 11–13% | 11–13% | OK |
| Cu | 0–0.3% | 0–0.3% | OK |
| Al | — | — | — |
| Fe | 0–0.8% | 0–0.8% | OK |
Mechanical properties
As Cast
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 130–170 | MPa |
| Elongation | 3–7 | % |
| Melting Point | 573–582 | °C |
| Density | ≥ 2.66 | g/cm3 |
Compatibility verdict
EN AW-4047 and EN AW-4047 / AlSi12(A): 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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