AlCuBiPb (EN AW-2011) – High-strength aluminum alloy for precision machining
Aluminum is one of the most versatile materials in the metal industry. The AlCuBiPb (EN AW 2011) alloy in particular stands out due to its outstanding machinability, high mechanical strength, and excellent surface quality. But how does this alloy compare to other metals such as steel?
Composition & Properties
The aluminum alloy AlCuBiPb consists of aluminum as the base metal, which is alloyed with copper (Cu), lead (Pb), and bismuth (Bi). These elements improve machinability and enable efficient processing, especially for CNC turned parts.
✔ Excellent machinability → Ideal for high-precision CNC turned parts
✔ High mechanical strength → Resistant to heavy loads
✔ Good surface quality → Minimal post-processing required
✔ Low ductility → Not suitable for forming processes
✔ Not weldable → Alternatively: use mechanical joining techniques
✔ Moderate corrosion resistance → Coating or anodizing recommended
Chemical Composition
| Element | Weight (%) |
|---|---|
| Aluminum (Al) | 91.2 – 94.6 |
| Copper (Cu) | 5.0 – 6.0 |
| Bismuth (Bi) | 0.2 – 0.6 |
| Lead (Pb) | 0.2 – 0.6 |
| Iron (Fe) | max. 0.7 |
| Silicon (Si) | max. 0.4 |
| Magnesium (Mg) | max. 0.2 |
Copper ensures high mechanical strength, while bismuth and lead improve chip formation, thus providing optimal machining properties.
Aluminum vs. Steel – Which material is better?
Many industrial applications use either aluminum or steel. While steel is known for its extreme hardness and resistance, aluminum offers crucial advantages in terms of weight, corrosion resistance, and machinability.
When should aluminum be used instead of steel?
✔ Lightweight construction: Aluminum is significantly lighter than steel, which is crucial in aerospace, automotive engineering, and mechanical engineering.
✔ Corrosion resistance: Aluminum forms a natural oxide layer and is less susceptible to rust than unalloyed steel.
✔ Ease of processing: EN AW 2011 can be milled and turned faster than many steel grades.
✔ Recycling: Aluminum is almost 100% recyclable, making it an environmentally friendly material.
Typical applications for EN AW 2011
Since aluminum EN AW 2011 offers excellent machinability, it is preferred for high-precision turned and milled parts in the following industries:
🔹 Automotive industry: Pistons, valves, bearing bushes, gears
🔹 Mechanical engineering: CNC-manufactured turned parts, spindles, axles
🔹 Electrical engineering: Connectors, nuts, screws
🔹 Aerospace: Mechanical components with tight tolerances
Thanks to its high dimensional accuracy and clean surface, EN AW 2011 is ideal for mass production of small to medium-sized components.
Mechanical properties of EN AW 2011 in detail
| Property | Value |
|---|---|
| Tensile strength (Rm) | 290 – 360 MPa |
| Yield strength (Rp0.2) | 150 – 270 MPa |
| Hardness (Brinell, HBW 10/500) | 95 – 110 |
| Density | 2.82 g/cm³ |
| Modulus of elasticity | 70 GPa |
| Melting point | 525 – 640 °C |
The values show that EN AW 2011 combines high mechanical strength with excellent machinability.
Comparison: Aluminum EN AW 2011 vs. other aluminum alloys
| Property | EN AW 2011 | EN AW 6082 | EN AW 7075 |
|---|---|---|---|
| Machinability | ⭐⭐⭐⭐⭐ Very High |
⭐⭐ Moderate |
⭐⭐⭐ Good |
| Strength | ⭐⭐⭐ Medium |
⭐⭐⭐⭐ High |
⭐⭐⭐⭐⭐ Very High |
| Weldability | ❌ |
✅ |
❌ |
| Corrosion Resistance | ⭐ Low |
⭐⭐⭐⭐ Very High |
⭐⭐ Moderate |
Those seeking a high-strength and machinable alloy should consider EN AW 2011. If weldability or high corrosion resistance are required, other materials such as EN AW 6082 or 7075 are more suitable.
When is AlCuBiPb (EN AW 2011) worthwhile?
EN AW 2011 is the perfect choice for applications requiring high strength, precise machinability, and good surface quality. This alloy is indispensable, particularly in the automotive and mechanical engineering industries.
Advantages:
- Excellent machinability → Ideal for CNC machining
- High mechanical strength
- Clean surface quality
Disadvantages:
Not weldable
Moderate corrosion resistance → Surface treatment recommended
If you need an alloy with outstanding machinability, EN AW 2011 is the right choice!
Order EN AW 2011 now!
Do you need high-quality Aluminum EN AW 2011 profiles, rods, or blanks? Find the right products at us, Alu-Verkauf, in the online shop.
