EN AC-AlSi7Mg0.3
EN AC-42100The most important aluminum sand and gravity die casting alloy worldwide. Excellent castability, good mechanical properties after T6 heat treatment, and outstanding weldability. Si 6.5-7.5% provides excellent fluidity, Mg 0.25-0.45% enables precipitation hardening. Used for automotive wheels, suspension components, aerospace structural castings, engine brackets, and high-integrity safety-critical castings. Equivalent to ASTM A356.0 and DIN G-AlSi7Mg.
Chemical composition comparison (wt%)
Side-by-side: EN AC-AlSi7Mg0.3 (EN) (EN 1706) vs ASTM
| Element | EN AC-AlSi7Mg0.3 (EN) | ASTM | Overlap |
|---|---|---|---|
| Si | 6.5–7.5% | — | — |
| Mn | ≤ 0.1% | — | — |
| Cu | ≤ 0.05% | — | — |
| Ti | ≤ 0.25% | — | — |
| Fe | ≤ 0.19% | — | — |
| Mg | 0.25–0.45% | — | — |
Mechanical properties
F
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 140 | MPa |
| Yield Strength | ≥ 80 | MPa |
| Elongation | ≥ 2 | % |
| Hardness HB | ≤ 45 | HB |
T6 (solution treated + artificially aged)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 230 | MPa |
| Yield Strength | ≥ 190 | MPa |
| Elongation | ≥ 2 | % |
| Hardness HB | ≤ 75 | HB |
| Density | ≥ 2.68 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_annealing | 530–540 °C | water | — | T6: solution treat + water quench |
| aging | 150–170 °C | air | — | T6: artificial aging 6-8h |
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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