Galvalume Steel Corrugated Roof Sheet: Advanced Protection for Extreme Environments
Galvalume Steel Corrugated Roof Sheet Product Overview
Galvalume® steel corrugated roof sheets are high-performance building materials composed of a 55% aluminum, 43.5% zinc, and 1.5% silicon alloy coating applied via hot-dip processing. Designed to outperform traditional galvanized steel, this innovative coating system provides 3× superior corrosion resistance, 2× higher heat reflectivity, and 30+ year service life in harsh climates. Compliant with ASTM A792, EN 10346, and JIS G3321 standards, Galvalume® is ideal for industrial, agricultural, and architectural applications requiring durability and energy efficiency.
Key Advantages
- Extreme Corrosion Resistance:
- The aluminum-rich layer forms a self-healing oxide barrier, reducing red rust by 85% vs. G90 galvanized steel.
- Salt spray resistance: 1,500+ hours (ASTM B117) in coastal environments.
- Thermal Efficiency:
- Solar reflectance: 75% (ASTM E903), lowering rooftop temperatures by 20°C and cutting cooling costs by 25%.
- High-Temperature Stability:
- Withstands sustained exposure to 315°C without coating degradation.
- Aesthetic Versatility:
- Smooth, spangle-free surface (Ra 0.8µm) with 85+ gloss units for premium painted finishes.
Technical Specifications
1. Base Material & Dimensions
- Thickness: 0.12mm (ultra-lightweight) to 6.00mm (structural) ±0.03mm tolerance
- Width: 600–1,500mm (optimized for corrugation profiles)
- Corrugation Depth: 15–50mm (meets ASCE 7-16 wind uplift requirements)
2. Alloy Coating Properties
| Parameter | Galvalume® | G90 Galvanized |
|---|---|---|
| Coating Weight | 150g/m² | 275g/m² |
| Salt Spray Lifespan | 1,500hrs | 900hrs |
| Thermal Emittance | 0.85 | 0.65 |
Mechanical Performance
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (A80%) |
|---|---|---|---|
| DX51D+AZ | 240–380 | 270–500 | ≥22% |
| S350GD+AZ | ≥350 | ≥420 | ≥16% |
| S550GD+AZ | ≥550 | ≥550 | – |
Tested per ISO 6892-1:2019 tensile standards
Manufacturing Process
- Hot-Dip Alloying:
- Steel cleaning: 3-stage alkaline degreasing (pH 11.5, 65°C)
- Continuous annealing: 730°C in 10% H₂ + 90% N₂ atmosphere
- Alloy bath immersion: 590°C with 1.5% Si for interlayer adhesion
- Surface Finishing:
- Zero Spangle (Code M): Laser-controlled crystallization
- Anti-Fingerprint (Code N5): Silane-based nano-coating
Environmental Adaptability
| Application | Recommended Solution | Service Life* |
|---|---|---|
| Coastal roofing | 150g/m² AZ + PVDF coating | 35+ years |
| Food processing plants | 75g/m² AZ + epoxy primer | 25–30 years |
| Solar farm mounting | 90g/m² AZ + bare alloy | 40+ years |
Based on ISO 12944-7 corrosion category CX
Installation & Fabrication
- Corrugation Profiles:
- Trapezoidal (32mm depth): 6.0kN/m² load capacity
- Sinusoidal (25mm depth): Ideal for curved structures
- Fastening Systems:
- EPDM-washered screws: 200mm spacing for cyclonic zones
- Seam-clip locking: Withstands 160km/h winds
- Cutting & Forming:
- Laser cutting: 6m/min at 4kW (1.5mm sheet)
- Press braking: 1.5× thickness minimum bend radius
Sustainability Features
- Recycled Content: 92% post-industrial steel scrap
- Coating Reclaim: 97% alloy recovery rate in remelting
- Energy Savings: Reduces building cooling loads by 18% (ASHRAE 90.1 compliant)
Global Material Equivalents
| China | Europe | USA | Japan |
|---|---|---|---|
| DC51D+AZ | DX51D+AZ | CS Type B | SGLCC |
| S350GD+AZ | S350GD+AZ | ASTM A792 | SGLC490 |
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