What exactly is wrought aluminum? What are the most common types of aluminum we encounter?
01 What Makes Wrought Aluminum “Wrought”?
Its core characteristics are excellent formability and high strength, distinguishing it from cast aluminum formed directly by casting.
Aluminum ingots are first melted and cast into billets, homogenized, then repeatedly processed via rolling, extrusion, drawing, and forging to form the required shapes:
- Rolled into thin sheets for beverage cans
- Extruded into profiles for windows and doors
- Forged into components for aircraft parts
Three Core Advantages of Wrought Aluminum
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Lightweight
Density is only about one-third that of steel, reducing weight while maintaining structural strength—making it ideal for aerospace and automotive applications.
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High Processability
Outstanding plasticity enables complex shaping via various deformation processes. Properties can be tailored through heat treatments such as annealing and quenching.
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Balanced Performance
Excellent electrical and thermal conductivity, strong corrosion resistance. Some strengthened grades achieve strength comparable to steel, suitable for demanding environments.
Key Difference: Wrought Aluminum vs. Cast Aluminum
- Cast aluminum: Liquid molding (molten aluminum poured into molds). Suitable for complex-shaped, low-to-moderate strength parts (e.g., engine blocks).
- Wrought aluminum: Solid-state plastic forming. Used for high-strength, high-plasticity structural components (e.g., aircraft wings, automobile bodies).
02 Two Major Categories of Wrought Aluminum Alloys
1. Non-Heat-Treatable Wrought Alloys
Strengthened by solid solution and cold working. Good plasticity and corrosion resistance, relatively low strength.
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Aluminum‑manganese alloys
Typical grade: LF21 (Chinese designation). Excellent corrosion resistance and formability. Used in beverage cans, cookware, and roofing sheets.
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Aluminum‑magnesium alloys
Higher strength than Al‑Mn alloys (> 300 MPa). Outstanding corrosion resistance, especially in marine environments. Used in truck bodies, storage tanks, small ship hulls, and architectural components.
2. Heat-Treatable Wrought Alloys
Strengthened by precipitation hardening (age hardening).
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Aluminum‑copper / Al‑Cu‑Mg alloys (Duralumin)
Designation: LY. Typical: LY12 (equivalent to 2024). Tensile strength: 470–480 MPa.
Widely used in aerospace for aircraft fuselages, wings, and high-strength mechanical parts.
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Aluminum‑magnesium‑silicon alloys
Designation: LD. Typical: LD1 (equivalent to 6063). Good weldability, corrosion resistance, and surface treatability (anodizing).
The primary alloy for architectural profiles: windows, doors, curtain walls, and furniture.
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Aluminum‑zinc‑magnesium‑copper alloys (Super Duralumin)
Designation: LC. Typical: LC9 (equivalent to 7075). Tensile strength: 540–570 MPa.
Ultra-high strength for aerospace and defense: aircraft landing gear and critical structural components.
03 Beyond Wrought Aluminum: Other Common Aluminum Types
1. Pure Aluminum
Purity ≥ 99%. Excellent conductivity and formability, low strength.
Used in electrical wires/cables, thermal insulation, aluminum foils (food/pharmaceutical packaging), and simple daily goods.
2. Cast Aluminum
Liquid-molded, high silicon content (7–25%), good flowability.
Used in engine blocks, transmission housings, wheel hubs, and small mechanical parts.
3. Aluminum Extrusions
Mostly Al‑Mg‑Si (6063) wrought alloy, formed by extrusion.
Used in construction, industrial frames, furniture, and home appliances.
4. Aluminum Sheets & Foils
- Aluminum sheets: Rolled from wrought aluminum. Thin sheets for automotive bodies; thick sheets for pressure vessels.
- Aluminum foils: Ultra-thin cold-rolled products. Used in food/pharmaceutical packaging and electronic shielding.
Conclusion
With high strength, light weight, and processability, it is essential in aerospace, construction, automotive, and many other industries. Pure aluminum, cast aluminum, and extruded profiles each serve irreplaceable roles in modern life.
