ThePipingMart Blog Grades Aluminum 7039 Alloy (UNS A97039) – Composition, Properties and Uses

Aluminum 7039 Alloy (UNS A97039) – Composition, Properties and Uses

Aluminium 7039

Aluminium 7039 is a unique alloy that possesses a combination of properties that make it an ideal material for various applications. UNS A97039 has excellent corrosion resistance and good heat resistance and is also machinable and weldable. In this blog post, we’ll explore 7039 Alloy in detail, looking at its properties, uses, and how to work with it.

7039 Alloy Composition

Element Content (%)
Zinc, Zn 3.5 – 4.5
Magnesium, Mg 2.3 – 3.3
Silicon, Si 0.3 max
Iron, Fe 0.4 max
Chromium, Cr 0.15 – 0.25
Manganese, Mn 0.1 – 0.4
Copper, Cu 0.1 max
Titanium, Ti 0.1 max
Remainder (total) 0.15 max
Aluminum, Al Remainder

7039 Alloy Physical Properties

Properties Metric Imperial
Density 2.74 g/cm³ 0.0990 lb/in³
Melting point 482-638°C 900-1180 °F

7039 Alloy Mechanical Properties

Properties Metric Imperial
Tensile strength (@diameter 12.7 mm/0.500 in) 450 MPa 65300 psi
Yield strength (@diameter 12.7 mm/0.500 in) 380 MPa 55100 psi
Elongation at break (@diameter 12.7 mm/0.500 in) 13% 13%
Elastic modulus 69.6 GPa 10100 ksi
Shear strength 255 MPa 37000 psi
Hardness, Brinell (@load 500 kg; thickness 10.0 mm/1100 lb;0.394 in) 133 133
Hardness, Knoop (converted from Brinell hardness value) 167 167
Hardness, Rockwell A (converted from Brinell hardness value) 50 50
Hardness, Rockwell B (converted from brinell hardness value) 81 81
Hardness, Vickers (converted from Brinell hardness value) 153 153

7039 Alloy Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 23.4 µm/m°C 13 µin/in°F
Thermal conductivity 140 W/mK 972 BTU in/hr.ft².°F

7039 Alloy Uses

Aluminium 7039 is an aluminum alloy that offers high levels of strength and toughness when heat-treated. It also has excellent ease of machining properties, making it ideal for creating parts that require precision and repeatable accuracy. Because of these traits, Aluminum 7039 is commonly used in the aircraft industry for jet engines and landing gear components and increasingly in automotive applications such as brake rotors, suspension attachments and structural elements like reinforcements braces. Beyond these, aluminium 7039 is also used for various industrial purposes such as military vehicles and equipment, oil pipelines, offshore structures and architectural constructions. With its impressive range of beneficial properties that span both strength and malleability and its varying resistance to corrosion, aluminium 7039 has quickly established itself as a preferred material for many large-scale industries.

Corrosion Resistance

Aluminum 7039 provides superior corrosion resistance when compared to other aluminum alloys. This makes it the perfect choice for outdoor applications that are exposed to the elements, such as marine equipment or automotive parts. It can even be used in coastal areas without any fear of corrosion. The alloy also offers excellent protection against stress cracking, making it suitable for use in highly corrosive environments.

Heat Resistance

Aluminum 7039 has an exceptional heat capacity and can withstand temperatures up to 500°C (932°F) without being damaged or losing its strength. As a result, it’s often used for high-temperature applications such as exhaust systems and industrial ovens, where the material needs to be able to handle extreme temperatures without failing.

Heat Treatment

Aluminium 7039 responds well to heat treatment which allows the metal to be hardened for increased strength and durability. It can be heated until it reaches its critical temperature before being cooled quickly using oil or water-quenching methods. This process increases the hardness of the metal by up to 50%.


Aluminum 7039 is machinable with conventional tools but may require some special techniques depending on the application. When machining this alloy, it’s important to remember that it has low thermal conductivity, so cooling times need to be increased significantly in order to avoid tool damage or deformation of the workpiece.


Due to its excellent corrosion resistance properties, aluminum 7039 is often used for welding applications such as pipelines, pressure vessels and tanks, as well as structural components such as frames and bridges. The alloy is also very easy to weld with both TIG and MIG welding processes providing good results every time.


In conclusion, aluminium 7039 is an ideal material for a variety of applications due to its excellent corrosion resistance combined with good heat resistance and machinability characteristics, making it easy to work with while still providing superior results every time you use it! Whether you’re looking for materials for outdoor structures or high-temperature equipment, aluminium 7039 should be your go-to choice!

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