6060 and 6063 aluminum are heat-treatable Al-Mg-Si alloys widely used for extruded profiles, tubes and architectural components.

The two alloys have similar chemical compositions, corrosion resistance, weldability and processing characteristics, but they are not identical. 6060 generally offers better extrusion flexibility and surface-finish consistency, while 6063 normally provides slightly higher mechanical strength in comparable extruded conditions.

6060 is commonly selected for complex architectural profiles and decorative anodizing. 6063 is frequently used where the profile requires a balance of appearance, dimensional consistency and moderate strength. Neither alloy should be described simply as an “aviation aluminum alloy”; both are primarily commercial extrusion alloys, although their use is ultimately determined by the design specification.

6060 vs 6063 Aluminum: Quick Comparison

Chemical Composition of 6060 and 6063 Aluminum

Both alloys use magnesium and silicon as their principal alloying elements. The main compositional difference is that 6063 permits a higher magnesium range, which contributes to its potential for slightly higher strength.

The chemical ranges above are based on published EN AW-6060 and EN AW-6063 extrusion data referencing EN 573-3. The purchase order and material certificate remain controlling for final acceptance. The Aluminum Association’s Teal Sheets are the defining registration source for wrought aluminum alloy designations and chemical-composition limits.

6060-T6 vs 6063-T6 Mechanical Properties

Mechanical properties must always be compared using the same:

1. Temper
2. Product form
3. Wall thickness
4. Test direction
5. Material standard

The values below are representative minimum ranges for extruded profiles and should not be treated as universal design values.

What Is 6060 Aluminum?

6060 aluminum is a medium-strength extrusion alloy valued for its combination of:

• Excellent extrudability
• Clean surface appearance
• Consistent anodizing response
• Good corrosion resistance
• Good forming and joining characteristics

Because it flows readily during extrusion, 6060 provides greater freedom when designing thin walls, decorative details and complex cross-sections.

Typical 6060 applications include:

• Window and door frames
• Curtain-wall profiles
• Facade systems
• LED-lighting housings
• Display rails
• Ceiling systems
• Furniture frames
• Decorative and interior profiles

6060 is normally selected when surface appearance and profile complexity are more important than maximum structural strength

What Is 6063 Aluminum?

6063 aluminum is one of the most widely used aluminum extrusion alloys. It combines:

• Good extrudability
• Moderate mechanical strength
• Good corrosion resistance
• Consistent dimensional performance
• Good decorative anodizing
• Good cold-forming capability

Typical 6063 applications include:

• Architectural profiles
• Door and window systems
• Curtain walls
• Railings
• Electrical enclosures
• Conduit profiles
• Heat sinks
• Precision tubing
• Furniture
• Irrigation pipe and tube

6063 can carry moderate loads, but higher-strength alloys such as 6061, 6005A or 6082 may be more appropriate for heavily loaded structural components.

Extrusion and Surface-Finish Differences

6060 Aluminum

6060 is generally preferred when the design requires:

• Complex profile geometry
• Thin walls
• Fine decorative details
• High-quality visible surfaces
• Consistent anodized appearance
• Efficient extrusion production

6063 Aluminum

6063 is generally preferred when the design requires:

• Slightly higher strength
• Good profile accuracy
• Good anodized appearance
• Moderate structural loading
• Tubular or heat-transfer profiles
• Reliable performance over long production runs

Both alloys are suitable for anodizing. Where the strictest decorative finish is the primary requirement, 6060 may have an advantage. Where some additional strength is required without changing to a higher-strength structural alloy, 6063 may be the better option.

Corrosion Resistance and Weldability

Both 6060 and 6063 provide good atmospheric corrosion resistance because a natural aluminum oxide layer forms on the surface.

Their corrosion performance can be further supported by:

• Anodizing
• Powder coating
• Proper drainage
• Avoiding severe crevice conditions
• Electrically isolating dissimilar metals
• Selecting compatible fasteners

Both alloys can be welded, but welding alters the heat-treated condition around the weld and heat-affected zone. The completed joint should therefore be evaluated according to the applicable design and welding standard rather than using only the original T6 base-material strength.

For marine piping and more aggressive marine fabrication, a high-magnesium alloy such as Aluminum Alloy 5083 may be more appropriate than 6060 or 6063.

6060 vs 6063: Which Alloy Should You Choose?

Choose 6060 When

• The profile has a complex cross-section.
• Decorative anodizing is important.
• The surface will remain visible.
• Medium strength is sufficient.
• Thin walls or detailed profile geometry are required.
• The product is mainly architectural or decorative.

Choose 6063 When

• Slightly higher mechanical strength is required.
• The component still requires a high-quality surface.
• The product is a tube, heat sink, railing or industrial profile.
• Dimensional consistency is important.
• The drawing or customer specification requires 6063.
• The profile carries moderate service loads.

The two alloys should not be substituted solely because their chemical compositions are similar. Substitution should consider temper, dimensions, mechanical properties, surface requirements and the governing product standard.

Standards for 6060 and 6063 Aluminum Products

Common standards for 6060 and 6063 extruded products include:

ASTM B221 covers hot-extruded aluminum and aluminum-alloy bars, rods, wire, profiles and tubes. For pressure-carrying seamless pipe and tube, ASTM directs users to specifications such as ASTM B210 or ASTM B241, depending on the product construction and application.

Related Aluminum Products

For projects involving piping, flanges or marine equipment, the following product pages provide additional technical and purchasing information:

For a piping system using extruded 6060 or 6063 tube, the connecting elbows, reducers and flanges should be reviewed for alloy compatibility, wall thickness, welding condition and applicable pressure design requirements.

Frequently Asked Questions

Is 6060 aluminum the same as 6063?

No. They are similar Al-Mg-Si extrusion alloys, but their chemical limits and performance are different. 6060 generally emphasizes extrusion and surface quality, while 6063 normally offers slightly higher strength.

Which is stronger, 6060 or 6063 aluminum?

In comparable T6 extruded conditions, 6063 is generally somewhat stronger. Actual values depend on product form and wall thickness.

Is 6063 an aerospace aluminum alloy?

6063 may appear in specialized aerospace-related components, but it is primarily an architectural and general extrusion alloy. It is not normally the first choice for highly loaded aerospace structures.

Which alloy is better for anodizing?

Both alloys anodize well. 6060 is often selected where decorative surface quality is the highest priority, while 6063 provides a strong balance between appearance and mechanical performance.

Can 6060 replace 6063?

Replacement may be possible in some profiles, but it should not be automatic. The engineer or purchaser should verify strength, temper, dimensions, finishing requirements and certification before approving substitution.

Which alloy is better for aluminum pipe fittings?

6060 and 6063 are mainly used for extruded profiles and tubes. For formed marine butt-weld fittings, 5083-O or another project-approved alloy may be more appropriate. Refer to ASTM B361 Aluminum Pipe Fittings for fitting-standard requirements.

6060 and 6063 Aluminum Product Supply

We supply aluminum extruded profiles, tubes and customized components according to customer drawings and project specifications.

Quotations should identify:

• Alloy: 6060 or 6063
• Temper: T5, T6 or T66
• Product form
• Cross-sectional drawing
• Wall thickness
• Length
• Surface finish
• Anodizing or coating requirements
• Quantity
• Material standard
• Inspection-certificate requirements

The final alloy selection should be based on the required balance of strength, extrusion complexity, visible surface quality, anodizing performance and application conditions.