6061 VS 6063 aluminum alloy has differences in chemical composition, physical properties, processing characteristics and application areas, etc. 6061 aluminum alloy has high strength and good mechanical properties, which is suitable for aerospace, automotive and other fields; 6063 aluminum alloy has good plasticity and ductility, which is suitable for construction, decorative engineering and other fields. Choosing the right type ensures optimal performance and use.

6061 aluminum alloy and 6063 aluminum alloy are two common aluminum alloy materials, and they differ in many ways. The following will provide an in-depth interpretation of these two aluminum alloys.

6061 VS 6063

Chemical composition

6061 aluminum alloy is a high-strength aluminum alloy that mainly contains silicon (Si), magnesium (Mg) and copper (Cu) elements. Its chemical composition is characterized by high content of silicon, magnesium and copper, which are 0.40%, 0.82% and 0.15%, respectively. This composition ratio gives 6061 aluminum alloy high strength and good mechanical properties.

In contrast, 6063 aluminum alloy has a lower chemical composition of silicon, magnesium and copper. The content of silicon ranges from 0.20%, magnesium to 0.45%, and copper to no more than 0.1%. The low silicon, magnesium and copper content makes 6063 aluminum alloy malleable and malleable, making it easy to process and form.


 Physical properties

Due to the difference in chemical composition, 6061 aluminum alloy and 6063 aluminum alloy differ in terms of physical properties.


Due to the high content of magnesium and copper in 6061 aluminum alloy, its tensile strength and yield strength are high. It is suitable for applications that require high strength and mechanical properties, such as aerospace, automotive, and transportation equipment.


The hardness of 6061 aluminum alloy is relatively high, which is suitable for occasions that require high hardness and wear resistance, such as bearings, gears and other mechanical parts. The hardness of 6063 aluminum alloy is relatively low, and it has good plasticity and ductility.

Corrosion resistance

Because the copper element in 6061 aluminum alloy has anti-corrosion and anti-oxidation properties, its corrosion resistance is better than that of 6063 aluminum alloy. It is suitable for application scenarios that require high corrosion resistance, such as marine environment, chemical industry, etc.

Thermal conductivity

6061 aluminum alloy has high thermal conductivity, which is suitable for electronic equipment and heat exchangers with high heat dissipation requirements. The thermal conductivity of 6063 aluminum alloy is relatively low, but it has good heat dissipation performance, which is suitable for applications with general heat dissipation needs.

6061 VS 6063

Processing characteristics


6061 aluminum alloy has good weldability and is suitable for various welding methods, such as MIG, TIG, etc. 6063 aluminum alloy can also be welded, but due to its high silicon content, appropriate welding process measures need to be taken to reduce the susceptibility to hot cracking.


Because 6061 aluminum alloy is harder, it is difficult to cut it. On the other hand, 6063 aluminum alloy is relatively soft and easy to machine.

Cold forming and forming

6063 aluminum alloy has good plasticity and ductility, and is suitable for all kinds of cold forming and forming processing. Although 6061 aluminum alloy can also be cold formed and formed, due to its high strength, it requires appropriate processing equipment and technology.

Surface treatment

Both can be anodized with the surface to improve the corrosion resistance and decorative effect. After anodizing, it can present different colors to meet diverse appearance needs.

Most of the 3C electronic aluminum enclosures in the market use 6063 aluminum profile as the enclosure material.

3C electronic aluminum enclosures

Areas of application

Aerospace field

Due to its high strength and excellent mechanical properties, 6061 aluminum alloy is widely used in the manufacture of structural components and mechanical parts in the aerospace field. For example, key parts such as aircraft frames, fuselage structures, landing gear, etc.


In automobile manufacturing, 6061 aluminum alloy is widely used in engine parts, transmission systems, wheels and other parts. Its high strength and good mechanical properties provide reliable structural support and durability for automobiles.

Construction and decoration engineering

Because 6063 aluminum alloy has good plasticity and ductility, it is easy to process and form, and is often used in construction and decoration engineering. Such as door and window frames, curtain wall structures, display racks, etc. Its appearance is of excellent quality and can meet diverse design needs.

Electronic equipment and heat sinks

Due to the high thermal conductivity of 6061 aluminum alloy, it is suitable for the manufacture of heat sinks and heat exchangers for electronic devices. Good heat dissipation helps to ensure stable operation and extended service life of electronic devices.

Ship and Offshore Engineering

In the field of shipbuilding and marine engineering, 6061 aluminum alloy can be used to manufacture key parts such as hull structure and offshore platform due to its good corrosion resistance. Its high strength and corrosion resistance provide a reliable material choice for these applications.

cnc keyboard case


There are a number of differences between 6061 and 6063 aluminum alloys in terms of chemical composition, physical properties, processing characteristics and areas of application. Choosing the right type of aluminum alloy for your specific needs will ensure the best performance and use of the material.

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