Galvalume® Steel Coil / Sheet / Plate (AZ/Al-Zn Coated)
Huaxiao-Alloy’s Galvalume® (55% Al-43.4% Zn-1.6% Si) delivers triple-defense corrosion resistance – combining aluminum’s barrier protection, zinc’s sacrificial cathodic action, and silicon’s alloy-layer control. Engineered for 3-6x longer service life versus galvanized steel in roofing, HVAC, and automotive applications.
1. PRODUCT SPECIFICATIONS & TOLERANCES
| Form | Thickness | Width | Coating Class | Surface Finish |
|---|---|---|---|---|
| Coil | 0.18–3.00 mm (±0.03mm) | 600–1,600 mm (±0.5mm) | AZ60/AZ90/AZ150 | Minimized spangle (M), Regular spangle (R) |
| Sheet | 0.30–4.50 mm (±0.05mm) | 900–2,200 mm (±1mm) | AZ75/AZ135 | Skin-passed (S), Anti-fingerprint (AF) |
| Plate | 2.30–20.0 mm (±0.4%) | 1,200–3,500 mm | AZ120 | Blasted/Coated (BC), Oiled |
Coating Mass Reference (ASTM A792):
- AZ60: 60 g/m² total (≈18µm)
- AZ150: 150 g/m² total (≈45µm)
2. BASE MATERIAL ENGINEERING
Optimized Steel Grades for Structural & Forming Performance
| Grade | Standard | Yield (MPa) | Tensile (MPa) | Typical Applications |
|---|---|---|---|---|
| S250GD+AZ | EN 10346 | 250–330 | 330–440 | Roofing, wall cladding |
| HCT600XD+AZ | EN 10346 | 550–680 | 600–750 | Solar tracker frames |
| ASTM A653 SS550 AZ | ASTM A653 | 550 min | 600 min | Automotive chassis parts |
| JSC490W+AZ | JIS G 3321 | 490 min | 510–640 | Warehouse shelves |
3. GALVALUME® COATING TECHNOLOGY
Microstructure & Protective Mechanism
- Coating Composition: 55% Al, 43.4% Zn, 1.6% Si
- Alloy Layer Structure:
- Top Layer: 80% Al-rich dendrites → forms Al₂O₃ barrier
- Interlayer: Zn-rich eutectic → sacrificial protection
- Substrate Bond: FeAl₃/Fe₂Al₅Si inhibition layer (<1µm)
- Self-Healing: Zn migrates to scratches via electrochemical potential
Performance Benchmarks
| Test | Huaxiao AZ90 | HDG (Z180) | Pure Aluminum Coating |
|---|---|---|---|
| Salt Spray (ASTM B117) | 1,200 hrs | 250 hrs | 600 hrs |
| Cyclic Corrosion (SAE J2334) | 200 cycles (rust-free) | 60 cycles | 100 cycles |
| Solar Reflectivity | 75% | 28% | 82% |
| Max Continuous Temp | 340°C | 200°C | 480°C |
4. MECHANICAL & PHYSICAL PROPERTIES
| Property | Test Method | AZ90 (0.7mm) | AZ150 (1.2mm) |
|---|---|---|---|
| Yield Strength | ASTM E8/E8M | 320 MPa | 400 MPa |
| Fatigue Limit (10⁷ cycles) | ISO 1143 | 280 MPa | 350 MPa |
| Thermal Conductivity | ASTM E1461 | 50 W/m·K | 48 W/m·K |
| Coefficient of Friction | ASTM D1894 | 0.10 (AF finish) | 0.14 (M finish) |
| Cut-Edge Creep (500h salt spray) | EN 13523-10 | 0.2 mm | 0.1 mm |
5. INDUSTRY-SPECIFIC APPLICATIONS
| Sector | Critical Component | Huaxiao Solution | Certification |
|---|---|---|---|
| Building & Construction | Standing seam roofs | AZ135 Coil (S finish) | FM Global 4471, UL 90 |
| HVAC & Ductwork | Air handling unit panels | AZ90 Sheet (AF finish) | SMACNA HVAC Duct Std. |
| Renewable Energy | Solar mounting structures | AZ150 Plate | AS/NZS 1170.2 Wind Load |
| Automotive | Trailer underbody shields | AZ120 Sheet | GMW16232-M Steel Grade |
FAQs: Galvalume® Steel Coil / Sheet / Plate (AZ/Al-Zn Coated)
A: Zn-rich zones in the eutectic structure sacrificially protect exposed edges with <0.5mm creep after 2,000 hrs salt spray (ASTM A857).
A: 1) Silicone sealant (ASTM C920) or 2) Huaxiao’s proprietary Zn-Mg edge coat – withstands 10% joint movement.
A: Yes – with 30% higher force to overcome Al oxide. Use dome electrodes + post-weld sealant to prevent galvanic corrosion.
A: 1) Alkaline clean → 2) Zirconium nano-conversion coating → 3) Epoxy primer → 4) PVDF/SMP topcoat.
A: 12 MT with ±4g/m² tolerance (ASTM A792 Class II).
A: 30-year substrate warranty (certified to AAMA 203-12).
Galvalume® Steel Coil / Sheet / Plate (AZ/Al-Zn Coated)
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