**EN AW-7075**

## Product Description

Aluminium alloy 7075 is one of the strongest commercially available aluminium alloys, belonging to the 7000-series. Zinc and copper additions give high specific strength with good toughness and fatigue resistance. Note: 7075 is not suitable for fusion welding and has inherently low corrosion resistance. Anodising is recommended; colour variation may result.

## Key Characteristics

• Highest strength grade in this range  
• Very good machinability despite high strength  
• Good toughness and fatigue resistance  
• NOT suitable for fusion welding  
• Low inherent corrosion resistance — anodising strongly recommended  
• Colour variation possible after anodising

## Mechanical Properties — EN 485-2

| Tensile Strength(Rm) | 503MPa(min) |  
| --- | --- |  
| Yield Strength(Rp0.2) | 435MPa(min) |  
| Elongation at Break(A50) | 7%(min) |  
| Hardness | ~150HB(Brinell,ISO6506) |  
| Elastic Modulus(E) | ~72GPa |  
| Density | 2.81g/cm3 |  
| Thermal Conductivity | ~130W/m·K |  
| Coeff.of Thermal Expansion | 23.6×10-6/K(20-100℃) |  
| Melting Range | 477-635℃ |  
| Electrical Conductivity | ~33%IACS |

$$
23.6\times10^{-6}/K(20-1000{}C)
$$

$$
477{6}3-635\ {{}^{\circ}}\mathbf C,
$$

## Chemical Composition — EN 573-3

| Silicon(Si) | ≤0.40% |  
| --- | --- |  
| Iron(Fe) | ≤0.50% |  
| Copper(Cu) | 1.20-2.00% |  
| Manganese(Mn) | ≤0.30% |  
| Magnesium(Mg) | 2.10-2.90% |

---

| Chromium(Cr) | 0.18-0.28% |  
| --- | --- |  
| Zinc(Zn) | 5.10-6.10% |  
| Titanium(Ti) | ≤0.20% |  
| Aluminium(Al) | Remainder |

## Machining Notes

Very good machinability at high cutting speeds with carbide tooling and flood coolant. Stress-relieved stock minimises distortion during aggressive material removal. Do not specify for welded assemblies. For corrosion protection specify anodising or chromate conversion coating.

## Typical Applications

Aerospace structural components, wing spars, fuselage frames, defence equipment, high-performance sporting goods, precision tooling, gears and shafts under high dynamic load.