1.What are the fundamental differences caused by the characteristics of the substrate?
Color-coated Coil
Base Material: Typically cold-rolled steel sheet, galvanized steel sheet, or aluminized zinc steel sheet, with an organic coating (such as PVC, PVDF, etc.) on the surface.
Characteristics: Steel is hard and has high strength, but low toughness and limited ductility. Attention must be paid to the resilience and hardness of the steel sheet during processing.
Aluminum-Magnesium-Manganese Sheet
Base Material: Aluminum-magnesium-manganese alloy (commonly AA3003/AA3004 series), containing magnesium and manganese to improve strength and corrosion resistance.
Characteristics: Aluminum alloy is soft, has excellent ductility, can withstand large deformations without cracking, and is easy to cold work.
2.How do the molding and processing methods compare?
Color-coated coils:
Suitable for roll forming, and can be produced in wavy, trapezoidal, and other shapes using continuous production lines.
When bending, pay attention to the minimum bending radius (usually a multiple of the sheet thickness); too small a radius can cause coating cracking or substrate breakage.
Limited cold bending performance; difficult to process complex three-dimensional shapes; generally requires factory prefabrication.
Aluminum-magnesium-manganese sheet:
Excellent ductility; can be easily deep-drawn, bent, and rolled, suitable for complex curved surfaces (such as arched roofs).
Strong manual forming capability; shapes can even be adjusted on-site.
Minimum bending radius is much smaller than that of steel sheets, making it more suitable for detailed work.
3.How do cutting and joining compare?
Color-coated coils:
Cutting requires metal cutting tools (such as shearing machines and saw blades), and the cut edges are prone to rust, requiring anti-corrosion treatment.
Connections often use self-tapping screws or interlocking seams, requiring high-quality sealant (to prevent rust at the cut edges).
Aluminum-magnesium-manganese sheets:
Cutting is easier, using conventional metal cutting tools, and the cut edges do not require special anti-corrosion treatment (the aluminum alloy naturally oxidizes to form a protective layer).
Connections commonly use aluminum alloy-specific rivets, welding (requiring special welding machines), or standing seam systems, resulting in better sealing.
4.How does surface treatment compare to damage?
Color-coated coils:
If the coating is damaged during processing, it can easily lead to corrosion of the substrate, requiring coating repair.
During processing, the coating must be protected from scratches; otherwise, its appearance and durability will be affected.
Aluminum-magnesium-manganese sheet:
The surface is usually coated with fluorocarbon or anodized, offering good wear resistance.
Even with minor scratches on the aluminum alloy substrate, the oxide film still provides some corrosion protection, preventing the damage from spreading.
5.How does the weight compare to the handling requirements?
Color-coated steel coils: Steel sheets have a high density (approximately 7.85 g/cm³), making them heavier and requiring more manpower and machinery for handling and installation.
Aluminum-magnesium-manganese steel sheets: Aluminum alloy has a low density (approximately 2.73 g/cm³), making them about one-third lighter and easier to handle and process on-site.