AlSi10MnMg (EN AC-43500)
The alloy of the future: designed for mega-castings and high-ductility structural die castings without heat treatment.
AlSi10MnMg (EN AC-43500) is the reference alloy for the mega-casting revolution and high-pressure structural die cast (HPDC) parts. Used by Tesla, BMW, Mercedes-Benz, and other OEMs to produce large structural parts in a single shot. Its copper-free design with controlled manganese (0.50–0.80%) enables high ductility in the F (as-cast) state, eliminating the need for heat treatment. Requires primary aluminum as the base due to its demanding iron limit (≤0.15%).
International Nomenclature
| Standard | Designation |
|---|---|
| EN (Europa) | EN AC-43500 · AlSi10MnMg |
| Equivalente AA | 365.0 / 367.0 (aprox.) |
| Nombres comerciales | Silafont-36 · Aural-2 · Maxxalloy-Ultra |
Chemical Composition
| Element | Symbol | Percentage |
|---|---|---|
| Aluminum | Al | Balance |
| Silicon | Si | 9.5–11.5% |
| Manganese | Mn | 0.50–0.80% |
| Magnesium | Mg | 0.10–0.50% |
| Iron | Fe | ≤0.15% |
| Copper | Cu | ≤0.05% |
| Titanium | Ti | ≤0.15% |
| Strontium | Sr | 0.01–0.03% |
| Zinc | Zn | ≤0.07% |
Physical Properties
| Property | Value |
|---|---|
| Density | 2.65 g/cm³ |
| Melting Range | 555–600 °C |
| Thermal Conductivity | 120–140 W/m·K |
| Electrical Conductivity | ~28% IACS |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 280–310 MPa (F (as-cast)) |
| Yield Strength | 130–160 MPa (F (as-cast)) |
| Elongation | 6–12% (F (as-cast)) |
| Hardness | ~75 HB |
Key Characteristics
- Designed for mega-castings and large-format structural HPDC parts
- High ductility in F state (as-cast): 6–12% elongation without heat treatment
- Copper-free (Cu ≤0.05%) for maximum corrosion resistance and ductility
- Mn (0.50–0.80%) neutralizes iron by forming compact phases instead of brittle needles
- Ultra-low iron (≤0.15%) requires primary aluminum base
- Eliminates heat treatment → reduces cost and distortion in large parts
Industries & Applications
Automotive — BEV Structural
Underbody mega-castings (Tesla), rear subframes, shock towers, battery tray components
Automotive — Body-in-White
Structural junction nodes, pillar reinforcements, crash management components
Transportation
Structural components for electric and autonomous vehicles
Special Notes
AlSi10MnMg is the alloy transforming the automotive industry through mega-castings. Tesla uses it for the Giga Press machine, producing the Model Y rear underbody in a single shot (previously 70+ stamped and welded parts). Manganese is key: it forms compact, rounded Al₁₅(Mn,Fe)₃Si₂ intermetallics, neutralizing iron's negative effects. This enables good ductility even at HPDC solidification rates. We manufacture this alloy exclusively with P1020/P0610 primary aluminum to meet the strict Fe ≤0.15% limit.
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