7178 aluminium alloy

7178 aluminum alloy is wrought alloy. It has high zinc content.[1] After annealing, aluminum alloy 7178 has high machinability.[2] Resistance welding can be used.[3]

Chemical composition

The chemical composition of Aluminium / Aluminum 7178 alloy is outlined in the following table. It is difficult to cold work. Forming is hard to use for this alloy. It has high machinability.[1]

Element[1] Content (%)
Aluminium / Aluminum, Al 88.1
Zinc, Zn 6.8
Magnesium, Mg 2.7
Copper, Cu 2.0
Chromium, Cr 0.26

Properties
Properties Metric
Density[1] 2.82 g/cm3
Melting point[1] 482 °C
Elastic modulus[1] 70-80 GPa
Poisson's ratio 0.33
Thermal expansion 23.4 (10-6/°C)
Ultimate Tensile Strength[4] 607 MPa
Tensile Yield Strength[4] 538 MPa

Designations

Aluminium alloy 7178 alloy can be designated as:[1]

  1. ASTM B209
  2. ASTM B221
  3. ASTM B241
  4. ASTM B316
  5. QQ A-200/13
  6. QQ A-200/14
  7. QQ A-250/14
  8. QQ A-250/21
  9. QQ A-250/28
  10. QQ A-430
  11. SAE J454

Advantages
  1. High corrosion resistance
  2. High tensile strength
  3. Excellent polish
  4. High machine strength
  5. High creep resistance
  6. High temperature strength
  7. High mechanical properties

[5]

Applications
  1. Aircraft components[1]
  2. Petroleum refineries[6]
  3. Boilers[6]
  4. Heat exchangers[6]
  5. Condensers[6]
  6. Pipelines[6]
  7. Cooling towers[6]
  8. Steam exhausts[6]
  9. Electric generation plants[6]

References
  1. "7178 aluminum alloy".
  2. "Annealing effect on 7178 aluminum alloys".
  3. "Resistance welding in 7178 alloy".
  4. "7178 aluminum alloy properties".
  5. "Advantage of 7178 alloy".
  6. "Aluminum 7178 applications".
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