Chemical Composition
Slight variations in composition can alter mechanical properties and corrosion resistance.
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Technical Reference
Aluminum Alloy Correspondence
Indicative equivalences between European and international designations.
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Aluminum Alloy Correspondences (indicative)
| Commercial Grade | EN 1706 | Designation | AFNOR / NF | ASTM / AA | BS / LM | DIN / W.-Nr. | Remarks |
|---|---|---|---|---|---|---|---|
AlSi7Mg0,3 | EN AC-42000 | AlSi7Mg0,3 | NF A51-700 | A356.0 / A356.2 | LM25 | 3.2311 | Versatile alloy. Good fluidity and good mechanical properties. |
AlSi10Mg | EN AC-43000 | AlSi10Mg | NF A51-702 | A360.0 / A360.2 | LM24 | 3.2381 | Excellent fluidity. Good corrosion resistance. |
AlSi12 | EN AC-44100 | AlSi12 | NF A51-704 | A413.0 / A413.1 | LM26 | 3.2581 | Good fluidity. Suitable for thin and complex parts. |
AlSi9Cu3(Fe) | EN AC-46000 | AlSi9Cu3(Fe) | NF A51-711 | A380.0 / A380.1 | LM6 | 3.2151 | Engine parts, blocks, and casings. Good hot properties. |
AlMg5 | EN AC-51200 | AlMg5 | NF A51-505 | 505.0 / 505.2 | LM2 | 3.3555 | Good corrosion resistance. Ideal for marine environments. |
AlCu4Ti | EN AC-21100 | AlCu4Ti | NF A51-203 | C355.0 / C355.2 | LM20 | 3.1655 | High mechanical strength after heat treatment. Stressed structural parts. |
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Alloy Families and Their Main Advantages
Si
Silicon (Al-Si)
Excellent castability, good dimensional stability, suitable for thin and complex parts.
Si
Mg
Silicon – Magnesium (Al-Si-Mg)
Good compromise between mechanical properties, corrosion resistance, and weldability.
Si
Cu
Silicon – Copper (Al-Si-Cu)
High mechanical and hot strength, suitable for engine parts and high stresses.
Mg
Magnesium (Al-Mg)
Excellent corrosion resistance, especially in marine and food processing environments.
Cu
Copper (Al-Cu)
Very high mechanical strength after heat treatment, for structural parts.
Important
The international equivalences indicated are approximate correspondences based on the most common standards. They do not constitute strict contractual substitutions: always refer to the customer specification and application requirements before any validation.
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Points of Attention
Heat Treatment
Metallurgical states (T6, T5, T4…) and treatment cycles strongly influence performance.
Casting Process
Foundry technology (gravity, low-pressure, permanent mold, core making…) impacts quality and properties.
Sealing
Sealing capability depends on the grade, design, and complementary treatments.
Machining
Machinability varies according to the grade and metallurgical state. Adapt tools and parameters.
Validation by Testing
Always verify conformity through testing (mechanical, corrosion, leak) according to customer specifications.
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