7178 aluminium alloy

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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

Applications

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

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "7178 aluminum alloy". 31 August 2012.
  2. ↑ "Annealing effect on 7178 aluminum alloys". Archived from the original on 2016-08-17.
  3. ↑ "Resistance welding in 7178 alloy". Archived from the original on 2006-03-13.
  4. ↑ 4.0 4.1 "7178 aluminum alloy properties". Archived from the original on 2004-05-21.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 "Aluminum 7178 applications". Archived from the original on 2021-01-08.

External links

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