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

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. "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. "7178 aluminum alloy properties". Archived from the original on 2004-05-21.
5. "Aluminum 7178 applications". Archived from the original on 2021-01-08.

External links

• https://www.makeitfrom.com/material-properties/7178-T6-Aluminum
• https://www.substech.com/dokuwiki/doku.php?id=wrought_aluminum-zinc-magnesium_alloy_7178