AZ150 Galvalume® Steel Sheet: Advanced 55% Aluminum-Zinc Alloy Coated Steel for Extreme Durability
Product Overview
The AZ150 Galvalume® steel sheet is a premium-grade construction material featuring a hot-dip aluminum-zinc-silicon alloy coating (55% Al, 43.5% Zn, 1.5% Si) with a total coating weight of 150g/m² (36μm per side). Engineered to deliver 4× the corrosion resistance of traditional G90 galvanized steel, this high-performance sheet achieves 2,000+ hours of salt spray protection (ASTM B117) and a 40+ year service life in marine, industrial, and high-humidity environments. Compliant with ASTM A792, EN 10346, and JIS G3321, AZ150 excels in roofing, automotive, and HVAC systems requiring unmatched strength and longevity.
Key Technical Specifications
1. Base Material & Dimensions
- Thickness: 0.12mm (ultra-thin cladding) to 6.00mm (structural beams) ±0.03mm tolerance
- Width: 600–1,500mm (optimized for roll-forming and laser cutting)
- Coating Thickness: 18μm (single side) / 36μm (both sides)
- Density: 3.75g/cm³ (alloy layer) / 7.85g/cm³ (base steel)
2. Alloy Composition & Protection Mechanism
| Element | Content (%) | Function |
|---|---|---|
| Aluminum | 55–58 | Forms self-repairing Al₂O₃ oxide barrier |
| Zinc | 41–43 | Sacrificial anode for edge & scratch protection |
| Silicon | 1.5–2.0 | Prevents brittle Fe-Al intermetallic formation |
Corrosion Protection: When exposed to moisture, zinc ions create a galvanic cell, while aluminum forms a dense oxide layer—reducing red rust by 85% vs. G90 galvanized steel.
Performance Advantages
- Superior Corrosion Resistance
- 2,000+ hours salt spray resistance (ASTM B117) vs. 900 hours for G90 galvanized steel.
- Edge protection: Zinc-rich phase sacrifices itself at cut edges, extending sheet lifespan by 3–5× in coastal zones.
- Thermal Efficiency & Reflectivity
- 75% solar reflectance (ASTM E1918) lowers rooftop temps by 20°C, reducing cooling costs by 25%.
- Thermal emittance: 0.85 (vs. 0.65 for galvanized steel), qualifying for LEED energy credits.
- High-Temperature Stability
- Withstands 315°C continuous exposure without coating delamination—ideal for exhaust systems.
- Formability & Aesthetics
- Zero-spangle finish (Ra 0.8μm) enables premium painted surfaces with 85+ gloss units.
- Bend radius: 1.5× thickness (per ASTM A755), suitable for complex architectural designs.
Mechanical Properties
| Grade (EN 10346) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (A80%) | Application |
|---|---|---|---|---|
| DX51D+AZ | 240–380 | 270–500 | ≥22% | Roofing |
| S350GD+AZ | ≥350 | ≥420 | ≥16% | Truck Beds |
| S550GD+AZ | ≥550 | ≥550 | – | Load Beams |
Tested per ISO 6892-1:2019 tensile standards
Manufacturing Process
- Hot-Dip Coating:
- Steel cleaning: 3-stage alkaline degreasing (pH 11.5, 65°C)
- Annealing: 730°C in 10% H₂ + 90% N₂ atmosphere
- Alloy bath immersion: 590°C with 1.5% Si for adhesion
- Surface Treatments:
- Anti-fingerprint (N5): Silane-based nano-coating prevents oxidation stains.
- PVDF coating: 25μm fluoropolymer layer for coastal architecture (40% gloss retention after 10 years).
Industry Applications
| Sector | Use Case | Recommended Coating | Service Life* |
|---|---|---|---|
| Construction | Standing seam roofing | 150g/m² AZ + PVDF | 40+ years |
| Automotive | Exhaust systems | 150g/m² AZ (N5) | 15–20 years |
| Agriculture | Grain silos | 90g/m² AZ + epoxy | 30+ years |
| Energy | Solar mounting | 60g/m² AZ (bare) | 35+ years |
Based on ISO 12944-7 CX corrosion category
Global Material Equivalents
| China | Europe | USA | Japan |
|---|---|---|---|
| DC51D+AZ | DX51D+AZ | ASTM A792 | SGLCC |
| S350GD+AZ | S350GD+AZ | CS Type B | SGLC490 |
Sustainability & Compliance
- Recycled Content: 92% post-industrial steel scrap
- RoHS Compliance: Lead <0.05%, Cadmium <0.01%
- LEED Contributions: 3–6 points for solar reflectance (SSc7.1)
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