413 (A413)
Eutectic aluminum-silicon alloy (~12% Si), maximum possible fluidity for complex geometry parts and ultra-thin walls.
413 (AlSi12) is the eutectic alloy of the Al-Si system with ~12% silicon, giving it the highest fluidity of all aluminum casting alloys. With no copper content, it offers excellent corrosion resistance. Ideal for very thin-walled parts, pressure-tight components, and applications where fluidity is critical.
International Nomenclature
| Standard | Designation |
|---|---|
| AA (USA) | 413.0 / A413.0 |
| EN (Europa) | EN AC-44100 · AlSi12(Fe) / EN AC-44200 · AlSi12 |
| DIN (Alemania) | G-AlSi12 / 3.2581 |
| JIS (Japón) | ADC1 |
| ISO | AlSi12 |
Chemical Composition
| Element | Symbol | Percentage |
|---|---|---|
| Aluminum | Al | Balance |
| Silicon | Si | 11.0–13.0% |
| Iron | Fe | ≤2.00% (413) · ≤1.30% (A413) |
| Copper | Cu | ≤1.00% (413) · ≤0.10% (A413) |
| Magnesium | Mg | ≤0.10% |
| Manganese | Mn | ≤0.35% |
| Zinc | Zn | ≤0.50% |
| Nickel | Ni | ≤0.50% |
Physical Properties
| Property | Value |
|---|---|
| Density | 2.66 g/cm³ |
| Melting Range | 574–582 °C |
| Thermal Conductivity | 121 W/m·K |
| Electrical Conductivity | ~31% IACS |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 290–310 MPa |
| Yield Strength | 130–150 MPa |
| Elongation | 2.5–3.5% |
| Hardness | ~80 HB |
Key Characteristics
- Eutectic composition (~12% Si) provides maximum fluidity among all Al-Si alloys
- No copper: excellent corrosion resistance in aggressive environments
- Ideal for ultra-thin wall parts and complex geometries
- Excellent pressure tightness for hydraulic and pneumatic components
- Narrow melting range (574–582°C) facilitates solidification control
Industries & Applications
Automotive
Transmission housings, engine components, pressure-tight parts, heat sinks
Hydraulics / Pneumatics
Valve bodies, manifolds, components requiring pressure tightness
Electrical
Junction boxes, motor housings, heat sinks
Special Notes
413 is the natural eutectic alloy of the aluminum-silicon system. Our AlSi11 closely resembles the 413 composition. The A413 version with low iron and no copper is ideal when maximum corrosion resistance is required. Equivalent to Japanese ADC1 and European AlSi12.
Frequently Asked Questions
What is the 413 (A413) alloy and what is it used for?
413 (AlSi12) is the eutectic alloy of the aluminum-silicon system with ~12% silicon, giving it the highest fluidity of all aluminum casting alloys. It is used for ultra-thin-walled parts and complex geometries, pressure-tight components, and applications such as transmission housings, valve bodies, manifolds, junction boxes and heat sinks.
What is the chemical composition of 413 and what role does silicon play?
The main alloying element is silicon, present at 11.0–13.0%, near the eutectic composition of the Al-Si system (~12%). This silicon level is what maximizes the fluidity of the molten metal and allows complex-geometry, thin-walled molds to be filled. The balance is aluminum, with controlled limits on iron, copper, magnesium, manganese, zinc and nickel.
Is 413 heat-treatable? What strength does it offer as-cast?
413 is a eutectic Al-Si alloy typically used in the as-cast condition (without precipitation-hardening tempers), since it contains virtually no magnesium (≤0.10%), the element that enables T6 treatment. As-cast it offers a tensile strength of 290–310 MPa, yield strength of 130–150 MPa, elongation of 2.5–3.5% and hardness of ~80 HB.
Why does 413 have such good corrosion resistance?
413 offers excellent corrosion resistance because it contains no copper as an alloying element (copper is the main driver of galvanic corrosion in aluminum alloys). The A413 version, with copper ≤0.10% and reduced iron (≤1.30%), is the ideal choice when maximum corrosion resistance in aggressive environments is required.
Why is 413 the best choice for pressure-tight parts and thin walls?
Its eutectic composition (~12% Si) gives it the highest fluidity of all Al-Si alloys, so the metal fully fills complex cavities and ultra-thin sections. In addition, its narrow melting range (574–582 °C) facilitates solidification control and reduces microporosity, which translates into excellent pressure tightness for hydraulic and pneumatic components.
What international designations are equivalent to 413?
413 corresponds to the AA designation 413.0 / A413.0 (USA). In Europe it is equivalent to EN AC-44100 (AlSi12(Fe)) / EN AC-44200 (AlSi12), in Germany to DIN G-AlSi12 (3.2581), in Japan to JIS ADC1, and under ISO to AlSi12. It is the natural eutectic alloy of the aluminum-silicon system.
Can Transformación Puebla manufacture 413? Do you have a similar alloy?
Yes. 413 is the natural eutectic alloy of the aluminum-silicon system, and our AlSi11 alloy closely resembles its composition. The A413 version, with low iron and no copper, is indicated when maximum corrosion resistance is required. Note that this high-purity version demands feedstock with low iron content.
Need 413 (A413)?
We manufacture this alloy in ingots, donuts, and bars to your exact specifications.