7075

Grade 7075 is a heat-treatable aerospace aluminium with additions of zinc, magnesium copper, manganese and chromium. Primarily a sheet and plate grade the 7075 aluminium was developed over 60 years ago and has been used as a standard aerospace grade ever since.

It is credited with being the first successful high strength Al-Zn-Mg-Cu alloy benefiting from the addition of chromium to develop good stress-corrosion cracking resistance. This attribute combined with a high strength, good properties at low temperatures and a moderate toughness and corrosion resistance make it an ideal grade for aerospace applications and structures especially when clad.

Chemical Composition

Aluminium

Rem

Silicon

0.40% max

Copper

1.2-2.0%

Iron

0.50% max

Manganese

0.30% max

Magnesium

2.1-2.9%

Zinc

5.1-6.1%

Chromium     

0.18-0.28%

Titanium

0.20% max

Total Others

0.15% max

Related Specifications

UNS97075

7075-T6

QQ A-200/11

AlZn5.5MgCu

SAE J454

MIL A-12545

Key Features

  • Very good Mechanical Strengths
  • High resistance to Stress Corrosion Cracking.
  • Reasonable Corrosion Resistance
  • Very good low temperature properties

Typical Physical Properties

Density        

2.81 g/cm³

Thermal conductivity

130 W/m°K

Thermal expansion coefficient

23.6 x 10-6

Modulus of elasticity

71.7 GPa

Fabrication Properties

Melting Point                                        

477-635°C

Cold Formability

Average (Annealed condition)

Machinability                                        

Good (Annealed condition)

Weldability

 

Resistance welding                                

Okay

Gas welding

Not Recommended

Typical Applications

Grade 7075 is commonly used for aircraft fittings, gears and shafts, fuse parts, meter shafts and gears, missile parts, regulating valve parts, worm gears, keys, aircraft, aerospace and defense applications; bike frame and all-terrain vehicle (ATV) sprockets.

This technical information is given by Holme Dodsworth Metals without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.