Aluminum-Magnesium-Manganese Metal Panelss for architectural roofing and wall cladding, roll formed from AA3004 series aluminium-magnesium-manganese alloy. The alloy contains approximately 1.0% to 1.5% manganese, 0.8% to 1.3% magnesium, small amounts of silicon and copper, and the balance aluminium. This composition gives a useful combination of low weight, adequate strength, and corrosion resistance, and it is compatible with standard seaming and roll forming equipment. SENBO supplies these panels with incoming checks on alloy grade, sheet thickness, and coating quality, and the forming lines are monitored for profile accuracy.
The panels are widely specified for large public buildings such as airport terminals, high-speed railway stations, sports stadiums, and exhibition centres. The surface receives a pre-roll coating, usually PVDF with a fluorocarbon resin content above 70%, which provides colour consistency and weather resistance. The roofing system is based on a standing seam profile with sliding T-clips. The clips hold the panels securely while allowing thermal movement, and the seam lock creates a watertight joint without relying on sealant.
| Item | Value | Reference or Notes |
|---|---|---|
| Base Material Grade | AA3004 (AlMg1Mn1) | Mn 1.0%–1.5%, Mg 0.8%–1.3%, balance aluminium |
| Common Thickness | 0.7–1.2 mm | Corrugated sheets available down to 0.6 mm |
| Common Profiles | YX65-300/400/430/500, YX25-300/330/430 | Standing seam systems; custom profiles available |
| Density | 2.73 g/cm³ | About one third of steel |
| Tensile Strength | 240–285 MPa | AA3004 H36/H46 temper |
| Yield Strength | ≥190 MPa | Minimum specified |
| Elongation | ≥3% | At break |
| Linear Expansion Coefficient | 0.000023 /°C | 20–100°C range |
| Fire Rating | Class A1 | Non-combustible |
| Design Service Life | >50 years | Coating warranty 15–20 years |
| Relevant Standards | GB 50345, GB 50207, EN 573-3 | National and international references |
Aluminium has a density of 2.73 g/cm³, roughly one third that of steel. The AA3004 alloy used here shows a tensile strength of 240 MPa to 285 MPa and yield strength of at least 190 MPa. These values allow the roof system to be lighter than a comparable steel roof, which reduces the load on the supporting structure. In long-span buildings and renovation work, the weight saving can reach about 30%.
When exposed to air, the panel surface forms a dense aluminium oxide layer that slows further corrosion. The alloy itself resists attack from many acids and alkalis, and the PVDF coating adds another protective barrier. These properties support a design life beyond 50 years for the base metal. The coating system typically carries a warranty of 15 to 20 years.
The standing seam profile uses T-clips that slide along the roof slope to accommodate thermal movement. Panels are prefabricated and assembled on site, which shortens construction time by more than 30% and keeps installation tolerance within 3 mm. At Fuping South Station on the Xi'an-Yan'an Railway, the 4,000 m² roof used a non-penetrating mechanical lock system. The result was a watertight surface with good wind uplift resistance and the ability to follow complex shapes. Gaoling Station, with a roof area of 4,585 m², used a composite build-up that included the standing seam panel, a waterproofing layer, insulation, a vapour barrier, an acoustic layer, and an Al-Zn coated profiled base sheet.
The roofing system achieves a Class A1 fire rating. With a melting point of 660°C, the aluminium tends to burn through locally in a fire rather than spreading flame across the surface, which can assist firefighting. For lightning protection, panels with a thickness of at least 0.7 mm may function directly as air termination devices according to GB 50057. This removes the need for separate roof penetrations for lightning conductors.
The alloy can be formed into straight, convex curved, concave curved, and fan-shaped panels. This supports single-slope, dual-slope, singly curved, and doubly curved roof geometries. The material's ductility also helps during on-site seaming operations.
Material certificates should confirm the alloy grade, mechanical properties, and coating type. Dimensional checks during production cover panel width, rib height, and length. For large projects, samples can be tested for coating thickness and adhesion. On-site receiving should verify the panel count, profile, and surface condition before installation.
AA3004 contains higher manganese and magnesium than common commercial alloys such as 3003. This gives better strength and corrosion resistance while remaining formable enough for standing seam profiles. It is widely used for roofing because of this balance.
Yes, the same material and standing seam system can be applied to wall cladding. The profile dimensions may differ, and wind load requirements for walls must be checked separately.
Curved panels are formed by roll forming or press braking to the required radius. Tapered panels are made by cutting the sheet to a variable width before forming. The forming limits depend on the panel profile and material temper, so the supplier should confirm feasibility early in the design.
A vapour control layer is normally included in the roof build-up to prevent moist air from reaching the insulation and causing condensation. The specific layers depend on the building use and climate. The roof system designer should specify the appropriate build-up.
Address
No. 17 Guanghai Road, Jinghai Economic Development Zone, Tianjin, China
Tel
