Aluminum Alloy Series Guide: 1000 to 7000 Series Explained
The 4-digit alloy designation system tells you the primary alloying element and expected properties.
Series Overview
- 1xxx: Pure Al (99%+). Excellent corrosion, high conductivity, low strength. Foil, chemical equipment.
- 2xxx: Copper alloy. Highest strength (2024: 470 MPa). Aerospace. Poor corrosion, needs cladding.
- 3xxx: Manganese. 20% stronger than 1xxx. 3003 = most widely used. Roofing, tanks, cooking utensils.
- 5xxx: Magnesium. Marine corrosion resistance. 5083/5086 for boat hulls, trailers.
- 6xxx: Mg + Si. Most versatile. 6061-T6 = structural default (310 MPa). 6063 = architectural extrusions.
- 7xxx: Zinc. Highest strength (7075-T6: 570 MPa). Aerospace, sporting goods.
Quick Reference
| Series | Strength | Corrosion | Key Use |
|---|---|---|---|
| 1xxx | Low | Excellent | Foil, Chemical |
| 3xxx | Low-Med | Excellent | General purpose |
| 5xxx | Med-High | Excellent | Marine |
| 6xxx | Medium | Good | Structural |
| 7xxx | Very High | Fair | Aerospace |
CoreMetal supplies aluminum across all major series. Contact us for the right alloy.
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