ThePipingMart Blog Grades Aluminum 7475 Alloy (UNS A97475) – Composition, Properties and Uses

Aluminum 7475 Alloy (UNS A97475) – Composition, Properties and Uses

Aluminium 7475

Aluminium 7475 is one of the most versatile aluminum alloys available on the market today. UNS A97475 has excellent corrosion resistance, heat resistance, and machinability, making it a great choice for many applications. In this blog post, we will take an in-depth look at the different uses of 7475 Alloy, as well as its properties and how to properly work with it.

7475 Alloy Composition

The chemical composition of Aluminum 7475 alloy is outlined in the following table.

Element Content (%)
Aluminum, Al 90.3
Zinc, Zn 5.7
Magnesium, Mg 2.3
Silicon, Si 1.50
Chromium, Cr 0.22

7475 Alloy Physical Properties

Properties Metric Imperial
Density 2.6-2.8 g/cm3 0.0939-0.1011 lb/in3
Melting point 546°C 1015°F

7475 Alloy Mechanical Properties

Properties Metric Imperial
Elastic modulus 70-80 GPa 10152-11603 ksi
Poisson’s ratio 0.33 0.33

7475 Alloy Thermal Properties

Properties Conditions
T (ºC) Treatment
Thermal conductivity 177 (W/m-K) 25 O

7475 Alloy Uses

Aluminium 7475 has a wide range of applications due to its excellent mechanical properties. It is widely used in aerospace components due to its high strength-to-weight ratio and low density. It is also widely used in automotive components such as wheels, engine blocks, transmission parts, and fuel tanks. Aluminium 7475 can also be found in commercial applications such as electrical enclosures and structural components.

Corrosion Resistance

This alloy has excellent corrosion resistance thanks to its high chromium content (3 percent). This makes it ideal for the marine and coastal applications where saltwater exposure can cause corrosion issues. This alloy also has good weldability, making it suitable for welding operations without additional protection or pre-treatment.

Heat Resistance

aluminum 7475 offers good heat resistance compared to other aluminum alloys with similar levels of strength. It can withstand temperatures up to 600°F (316°C) before losing its strength or becoming brittle. This makes it a great choice for automotive parts that are exposed to high temperatures due to engine exhaust or other factors.

Heat Treatment

Aluminium 7474 does not require special heat treatment techniques but can be cold-worked by stretching or bending the material into the desired shape before use. Cold working increases the tensile strength of the material significantly while still maintaining good ductility and formability.


Aluminium 7474 can easily be machined using standard tools such as drill bits, end mills, taps and dies, reamers etc. It is important to use cutting fluids when machining this alloy as they will help reduce friction and improve tool life while increasing surface finish quality. The surface finish should be between 32~63 µm Ra (roughness average).


Welding aluminum 7474 requires special attention when compared to other alloy types because this alloy is prone to cracking during welding operations if not managed correctly. To ensure successful welds, preheating should be performed prior to welding with temperatures ranging from 300500°F (149260°C). Post-weld heat treatment should also be done at 650700°F (343371°C), depending on application requirements.


In conclusion, aluminium 7474 is one of the most versatile alloys available on the market today due to its excellent mechanical properties, including corrosion resistance, heat resistance and ease of machining/welding, making it suitable for a wide range of applications from aerospace components through automotive parts right down commercial items like electrical enclosures and structural components! Its ability to withstand high temperatures holds up well against other alloys with similar level strengths, making it a great option for hot environments like under car engines! Finally, thanks to proper heat-treating techniques, you can ensure optimal performance from your aluminium parts! Allowing you better longevity from your products whilst ensuring safety standards are met when welding & machining! Thanks for reading our article about Aluminium 7474.

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