Designation
- Grade
- EN AC-AlSi7Mg0,3 (EN AC-42100)
- UNS
- —
- EN designation
- EN AC-42100 (EN AC-AlSi7Mg0,3)
- Standard
- EN 1706
- Family
- Aluminium alloys
- Density
- ≈ 2.68 g/cm³
- Usual delivery condition
- Solution treated and artificially aged (T6)
Chemical composition
| Element | Mass fraction, % |
|---|---|
| Si | 6.5–7.5 |
| Mg | 0.25–0.45 |
| Fe | ≤ 0.19 |
| Cu | ≤ 0.05 |
| Mn | ≤ 0.10 |
| Zn | ≤ 0.07 |
| Ti | ≤ 0.25 |
| Al | bal. |
Main elements only. Phosphorus, sulphur and residual-element limits are specified in the standard and are not reproduced here.
Mechanical properties
Mechanical properties depend on the heat-treatment condition and the ordering specification and are therefore not listed as single values. They are agreed per project.
Characteristics
- Corrosion and oxidation behaviour
- Moderate resistance: atmosphere, fresh water and mild media
- Weldability
- Good with matching filler and standard procedures
- Machinability
- Good in the appropriate heat-treatment condition
- Typical applications
- Aerospace Automotive Electrical General engineering
International cross-reference
| System | Designation | Relationship |
|---|---|---|
| ASTM | A356.0 (ASTM B618/B618M (investment castings); AA A356.0) | Similar composition |
Casting and processing considerations
Mechanical properties depend strongly on melt quality (hydrogen and oxide content), iron level and local solidification rate; values from separately cast test bars and from the casting itself can differ. The ceramic shell cools aluminium slowly compared with a metal die, which should be considered when property requirements are taken over from other casting processes.
Reference data compiled from the cited standards for orientation. Always work from the current edition of the governing specification; values are not a guaranteed LOSTWAX TR delivery specification.