When it comes to structural aluminum profiles for building construction, curtain wall systems, or even modular framing, choosing the right alloy is crucial. Two of the most widely used aluminum alloys in structural applications are 6061 T6 and 6063—but they’re far from interchangeable.
As a leading B2B aluminum extrusion manufacturer exporting to wholesalers, importers, and factories across Europe, America, Africa, Latin America, and Asia, we’re breaking down their key differences to help you pick the right material for your structural needs.
Mechanical Properties: Strength vs. Workability
6061 T6: The “High-Strength” Choice
The T6 heat treatment (solution annealing + artificial aging) gives it exceptional rigidity, making it ideal for heavy-duty structural parts.
- Aerospace grade 7075 alternatives for less extreme industrial structural needs
- Load-bearing aluminum extrusions for solar panel frames that withstand wind and snow loads
- Heavy-duty LED lighting aluminum heat sink profiles that double as structural supports
6063: The “Workable” Option
It’s softer and more malleable, which makes it easier to extrude into complex shapes. While not as strong as 6061 T6, it’s still sufficient for low-to-medium load structural applications.
- Custom U-channels or small T-slot profiles
- Non-load-bearing broken bridge aluminum profiles for window frames
- Lightweight architectural trims and curtain wall systems
Mechanical Properties Comparison
Corrosion Resistance
6061 T6 Corrosion Resistance
Offers good corrosion resistance, especially when paired with finishes like anodizing. However, its higher copper content means it’s slightly less resistant than 6063 in harsh outdoor environments.
Best For:
- Indoor structural systems (e.g., modular framing systems in factories)
- Covered outdoor applications (e.g., shaded solar panel frames)
6063 Corrosion Resistance
Boasts excellent corrosion resistance, thanks to its higher magnesium and silicon content (and lower copper). This makes it a top pick for outdoor structural use.
Best For:
- Outdoor structural use (e.g., anodized black aluminum profiles for curtain wall systems)
- Coastal construction projects (resistant to pitting from saltwater)
- Powder coated white aluminum extrusions for exterior building trims
Cost & Availability
6061 T6 Cost
Typically 15–25% more expensive than 6063. Its heat treatment process adds production time, and it’s often produced in custom lengths for specialized structural needs.
Best For:
Projects where strength is non-negotiable—even if it means a slightly higher budget.
6063 Cost
The more cost-effective option. It’s faster to extrude (no complex T6 heat treatment for basic grades) and widely available in standard stock lengths (5 meters) and shapes.
Best For:
High-volume structural orders, like aluminum profiles for furniture manufacturing or bulk orders of architectural window profiles for wholesalers.
Structural Application Scenarios
Choose 6061 T6 If:
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Load-bearing structural parts
Structural aluminum profiles for building construction like beams or columns.
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Industrial structural use
Heavy-duty LED lighting aluminum heat sink profiles that double as structural supports, or aluminum profiles for high-speed rail train manufacturing components.
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Moderate outdoor exposure
Solar panel frames in inland regions.
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Automotive components
Its strength balances lightweight needs, making it ideal for automotive structural frames.
Choose 6063 If:
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Low-to-medium load structural parts
Broken bridge aluminum profiles for window frames, lightweight curtain wall trims.
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Complex extruded shapes
Custom U-channel extrusions, small T-slot profiles for modular displays.
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Outdoor or corrosive environments
Coastal architectural structures with brushed finish aluminum angle profiles.
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Non-load-bearing curtain walls
For decorative purposes or where structural support is provided by other elements.
Why Partner With Us
Customization
We produce custom size aluminum U-channel extrusions, seamless square tubing, and T-slot profiles in both 6061 T6 and 6063—tailored to your structural drawings.
Global B2B Support
We supply wholesalers, importers, and factories worldwide with bulk orders and handle export logistics to your region.
Full Finishes
Offer anodized black, powder-coated white, or brushed finishes to boost corrosion resistance and aesthetics for structural use.
Competitive Pricing
Direct factory pricing with no middlemen—critical for B2B buyers looking to maximize margins on structural aluminum products.
