What Is 6063 Aluminum? | Properties, Applications & Comparison
6063 aluminum, also referred to as aluminum alloy 6063, is a medium-strength aluminum alloy mainly composed of aluminum, magnesium, and silicon. It belongs to the 6xxx series, a group well known for excellent corrosion resistance and outstanding extrusion performance.
Because of its smooth surface quality and ability to form complex cross-sections, 6063 aluminum alloy properties make it one of the most widely used materials for architectural, decorative, and precision-extruded applications. As a professional aluminum supplier, GNEE offers high-quality 6063 aluminum products to meet diverse industrial and architectural needs.
6063 Aluminum Alloy Properties Overview
The balanced 6063 aluminum material properties allow manufacturers and designers to achieve both reliable performance and refined appearance. Its combination of moderate strength, corrosion resistance, and superior surface finish makes it ideal for extrusion and precision machining.
Chemical Composition of 6063 Aluminum
The performance of 6063 aluminum is largely determined by its controlled chemical composition. Magnesium and silicon combine to form magnesium silicide (Mg₂Si), which contributes to strength, thermal conductivity, and excellent finishing characteristics.
| Element | Content (%) |
|---|---|
| Aluminum (Al) | Balance |
| Magnesium (Mg) | 0.45 – 0.90 |
| Silicon (Si) | 0.20 – 0.60 |
| Iron (Fe) | ≤ 0.35 |
| Copper (Cu) | ≤ 0.10 |
| Manganese (Mn) | ≤ 0.10 |
| Zinc (Zn) | ≤ 0.10 |
| Titanium (Ti) | ≤ 0.10 |
The density of aluminium alloy 6063 is approximately 2.70 g/cm³, providing a lightweight solution without sacrificing durability.
Corrosion Resistance of 6063 Aluminum
One of the most valued 6063 aluminium properties is its excellent resistance to corrosion. The high aluminum content and Mg-Si system allow the alloy to naturally form a protective oxide layer, making it suitable for outdoor, marine, and industrial environments.
After anodizing, 6063 aluminum gains even stronger resistance to oxidation, moisture, and wear, while also achieving an enhanced decorative appearance-ideal for visible and long-term applications.
Extrudability of 6063 Aluminum Alloy
Among all 6xxx series alloys, 6063 aluminum stands out for its exceptional extrudability. It can be easily formed into complex, thin-walled, and high-precision profiles, making it a preferred material for architectural systems and decorative components.
During extrusion, aluminium 6063 maintains uniform surface quality and dimensional consistency, resulting in long, defect-free sections. This also benefits CNC machining, as pre-extruded material requires minimal surface finishing and improves machining efficiency.
Surface Finish and Aesthetics of 6063 Aluminum
Few alloys can match the finishing capability of 6063 aluminum alloy. Its fine grain structure supports anodizing, powder coating, polishing, and painting. After anodizing, the surface becomes harder, more scratch-resistant, and visually refined.
Depending on the finishing process, 6063 aluminum can achieve a matte, satin, or mirror-like appearance, making it an excellent choice for decorative and high-visibility components supplied by GNEE.
Tempers of 6063 Aluminum Alloy
6063 aluminum is available in multiple tempers to suit different mechanical and forming requirements. The most common are 6063-T5 and 6063-T6, widely used in extrusion and precision applications.
| Temper | Process | Key Characteristics |
|---|---|---|
| 6063-O | Annealed | Very soft, excellent formability |
| 6063-T1 | Naturally aged after cooling | Moderate strength, good ductility |
| 6063-T4 | Solution heat treated & naturally aged | High ductility for complex forming |
| 6063-T5 | Artificially aged after extrusion | Balanced strength and surface quality |
| 6063-T6 | Solution heat treated & artificially aged | Maximum strength and hardness |
| 6063-T832 | Cold worked & stabilized | High dimensional stability |
Additional tempers such as T52, T53, T54, T55, and T62 are used to achieve specific mechanical performance requirements.
Common Applications of 6063 Aluminum
Thanks to its balanced properties, 6063 aluminum is widely used across multiple industries.
Architectural Uses of 6063 Aluminum
Often called the "architectural alloy," 6063 aluminum is ideal for:
Window and door frames
Curtain wall systems
Decorative trims and profiles
Its corrosion resistance and excellent anodized finish ensure a long-lasting appearance in outdoor environments.
Automotive Applications
In automotive and EV industries, 6063 aluminum alloy is used for:
Roof rails and trim parts
Radiator tubes and heat-dissipation components
Its lightweight structure and high al 6063 thermal conductivity support efficient temperature control.
Electrical Applications
Although slightly less conductive than pure aluminum, 6063 aluminum offers better mechanical strength, making it suitable for:
Busbars
Electrical enclosures
Connectors and housings
Irrigation Systems
Aluminium alloy 6063 is widely used in irrigation tubing and fittings due to its corrosion resistance, smooth inner surface, and ease of installation.
Lighting Industry
LED housings, reflectors, and heat sinks commonly use 6063 aluminum because of its excellent thermal conductivity and premium surface finish.
Furniture Manufacturing
Modern furniture frames benefit from 6063 aluminum material properties, including light weight, corrosion resistance, and design flexibility, supporting elegant and durable designs.
6061 Aluminum vs. 6063 Aluminum
Choosing between 6061 and 6063 aluminum depends on strength requirements and visual expectations.
| Property | 6061 Aluminum | 6063 Aluminum |
|---|---|---|
| Strength | Higher | Medium |
| Machinability | Very good | Good |
| Corrosion Resistance | Excellent | Excellent (better after anodizing) |
| Surface Finish | Coarser | Smooth and decorative |
| Extrudability | Moderate | Excellent |
| Formability | Moderate | High |
| Thermal Conductivity | ~167 W/m·K | ~200 W/m·K |
| Typical Uses | Aerospace, fixtures | Architecture, lighting, CNC parts |
6061 aluminum is preferred for high-strength structural parts, while 6063 aluminum is chosen when surface quality, extrusion complexity, and aesthetics are priorities.
6063 Aluminum Solutions from GNEE
With its outstanding balance of performance and appearance, 6063 aluminum alloy remains one of the most versatile materials in modern manufacturing. GNEE supplies premium 6063 aluminum profiles, tubes, and customized extrusions for architectural, industrial, and precision applications worldwide.
Contact GNEE today to get expert support and tailored aluminum solutions for your project.
