7075

ASTM B209 / AlZn5.5MgCu / 7075 / W

Chemical Properties % Value
Silicon (Si)0,00 - 0,40
Chromium (Cr)0,18 - 0,28
Manganese (Mn)0,00 - 0,30
Magnesium (Mg)2,10 - 2,90
Copper (Cu)1,20 - 2,00
Titanium (Ti)0,00 - 0,20
Iron (Fe)0,00 - 0,50
Zinc (Zn)5,10 - 6,10
Aluminium (Al)Balance
Physical Properties Value
Density2.81 g/cm³
Melting Point477°C
Thermal Expansion24 µm/m.°C
Modulus of Elasticity71 GPa
Thermal Conductivity130 W/m.K
Electrical Resistivity%33 IACS
Mechanical Properties Value
Proof Strength138 Mpa
Yield Strength331 Mpa
Shear Strength130 MPa
Elongation A50 mm%12
Hardness150 HB

7075 W aluminum alloy is presented in a solution heat-treated condition but not fully aged (hardened), which means it has not yet reached its final strength. Despite this, it offers improved formability, making it ideal for preliminary stages of production in aerospace, defense, sports equipment, and other high-performance machinery components. This allows the creation of complex geometries, which can later be brought to their desired final properties through subsequent aging treatments.

The alloy’s surface can be anodized, enhancing both its aesthetics and corrosion resistance. While the 7075 series is generally challenging to weld, the W condition, being not fully hardened, may allow limited welding possibilities using appropriate filler metals and careful heat input control. Compared to fully hardened states (such as T6 or T7), bending and forming are relatively easier in the W condition, enabling the production of intricate shapes prior to the final heat treatment.

Though the alloy in the W condition does not yet offer its maximum fatigue strength, it can still maintain structural integrity in environments with high vibration through a planned sequence of heat treatments to achieve the required durability. For instance, it can be used in aircraft fuselages or automotive structural components where fatigue resistance is critical, with final processing steps enhancing its long-term performance. Corrosion resistance can also be improved by proper aging treatments and surface coatings.

Its advantages include better formability before final hardening, the potential for anodizing, and the flexibility of achieving desired strength levels through subsequent treatments. However, in the W condition, the alloy has not attained its maximum strength or fatigue resistance, welding remains somewhat limited, and the manufacturing process depends on appropriate heat treatment sequences. Overall, 7075 W aluminum alloy is an excellent choice for high-performance applications requiring production-stage flexibility coupled with the potential for eventual high-strength performance.

 

ALLOY DESIGNATIONS
 
7075 W  has similarities to the following standard designations and specifications ;

Sheet as; 7075 W, AMS QQ-A-250/12, 

ASTM B209

 

Choosing Factors for 7075 W:

  • Strength: Average
  • Machining: Normal
  • Weldability: Weak
  • Formability: High
  • Corrosion Resistance: Moderate
  • Heat Treating:Yes
 
 
Some Well-Known Applications for 7075 W:
 
For special projects which desired Hi-Form
 
 
 
SUPPLIED FORMS
 
7075 W  is supplied in sheet form.
 
  • Sheet
DELIVERY:
Mechanical Properties
Thickness (mm) Proof Strength (Min.) Yield Strength (Min.) Elongation A50 mm %
Over 6.3 up to & incl. 12.6 462 MPa 538 MPa %9
Over 12,7 up to & incl. 25,4 469 MPa 538 MPa %7
Over 25,4 up to & incl. 50,8 462 MPa 531 MPa %6
Over 50,8 up to & incl. 63,5 441 MPa 524 MPa %6
Over 63,5 up to & incl. 76,2 421 MPa 496 MPa %5
Over 76,2 up to & incl. 88,9 400 MPa 490 MPa %5
Over 88,9 up to & incl. 101,6 372 MPa 462 MPa %3