Material Definition
AZ50 Galvalume® is a cold-rolled carbon steel substrate coated with an aluminum-zinc-silicon alloy (55% Al, 43.4% Zn, 1.6% Si) via continuous hot-dip process. Compliant with ASTM A792/A792M and EN 10346 (DX51D+AZ) standards.
Key Parameters
- Coating Weight: 150 g/m² (AZ150 equivalent, 0.50 oz/ft² total both sides)
- Coating Thickness: 20-27 μm (varies with surface profile)
- Base Steel Thickness: 0.3-2.0 mm (commercial grades)
- Tensile Strength: 270-500 MPa (dependent on substrate grade)
Technical Advantages
- Corrosion Resistance:
- 2-6x superior to G90 galvanized steel in salt spray tests (1,500-2,500 hrs to red rust)
- Self-healing properties via sacrificial Zn and Al₂O₃ barrier formation
- Thermal Stability:
- Sustains 315°C continuous service (Al-Si eutectic protection)
- Reflectivity: 80% solar radiation (reduces heat absorption)
- Mechanical Performance:
- Elongation: 15-25% (ASTM A370)
- Microhardness: 80-120 HV (coating layer)
Manufacturing Process
- Surface Preparation:
- Alkaline cleaning (pH 10-12) → Acid pickling (HCl 15%) → Fluxing (NH₄Cl)
- Coating Application:
- Molten alloy bath: 600-620°C immersion → Air knife control (coating uniformity ±5%)
- Post-Treatment:
- Chromate-free passivation (Ti/Zr-based) → Oiling (C5-C8 anti-fingerprint)
Application Matrix
1. Architectural & Construction
| Component | Specification | Performance Benefit |
|---|---|---|
| Roofing Panels | 0.4-0.7mm AZ50 + PVDF coating | 40-year warranty in C5 environments |
| Wall Cladding | 0.5-1.2mm AZ50 with stucco emboss | 90% reflectivity reduces HVAC load |
| Garage Doors | 0.8-1.5mm AZ50 + polyester finish | Impact resistance: 10J (ISO 6603) |
2. Automotive Engineering
- Exhaust Systems:
- 1.0-2.0mm AZ50 with Aluminized topcoat
- Thermal cycling resistance: -40°C ↔ 650°C (1,000 cycles)
- Fuel Tanks:
- 1.5mm AZ50 + internal polymer lining
- Corrosion warranty: 15 years (NACE TM0172 compliant)
3. Appliance Manufacturing
- HVAC Components:
- 0.6-1.2mm AZ50 with smooth finish
- Condensate resistance: pH 2-12 exposure
- Microwave Cavities:
- 0.8mm AZ50 + IR-reflective coating
- EMI shielding: 60-80 dB (1-10 GHz)
4. Agricultural Infrastructure
- Poultry Housing:
- 0.7mm AZ50 with antimicrobial coating
- NH₃ corrosion resistance: <1μm/year loss
- Grain Silos:
- 2.0mm AZ50 structural panels
- Abrasion resistance: 500+ Taber cycles (CS-10 wheel)
Comparative Performance
| Property | AZ50 Galvalume® | G90 Galvanized |
|---|---|---|
| Coastal Corrosion Life | 25-40 years | 8-12 years |
| Thermal Conductivity | 25 W/m·K | 50 W/m·K |
| Paint Adhesion | Class 1 (ASTM D3359) | Class 2 |
| Cost Premium | 15-20% | Baseline |
Quality Assurance
- Coating Inspection: XRF testing (Zn/Al/Si ratio control ±1%)
- Flatness Tolerance: ≤1.5mm/m (EN 10130)
- Certifications:
- LEED-compliant (recycled content ≥25%)
- FM Global Approved (Class 1 Fire Rating)
Available in coil (ID 508/610mm) or pre-cut sheets (≤12,000mm length). Custom patina finishes (weathered/Cor-Ten appearance) available for architectural applications.
Note: AZ50 Galvalume® is a registered trademark of BIEC International Inc. Consult datasheets for specific chemical exposure limitations.
Product Parameters
| Product Name | AZ50 Galvalume Steel Sheet |
| Thickness | 0.12mm-6.00mm |
| Width | 600mm-1500mm |
| Length | 1m-12m, Support Customization |
| Standard | AISI, ASTM, DIN, JIS, GB, JIS, SUS, EN, etc. |
| Thickness of Aluminum Zinc Coating | 30-185g/m² |
| Content of Al-Zn Coating | Al: 55%, Zn: 43.5%, Si: 1.5% |
Chemical Composition
| Al | Zn | Si | Fe | Cu | Cd | Pb | Sn | Ni | Close Cr |
| 55-58 | 41-43 | 1.5-2 | 0.25 | 0.03 | 0.05 | 0.01 | 0.05 | 0.05 | 0.05 |
Mechanical Properties
| Grade | Yield Strength MPa≥ | Tensile Strength MPa≥ | Elongation A%≥ |
| DX51D Z/ZM/AZ/AM | 240-380 | 270-500 | 22 |
| DX52D Z/ZM/AZ/AM | 140-300 | 270-420 | 26 |
| DX53D Z/ZM/AZ/AM | 140-260 | 270-380 | 30 |
| DX54D Z/ZM/AZ/AM | 120-220 | 260-350 | 36 |
| S220GD Z/ZM/AM | 220 | 300 | 20 |
| S250GD Z/ZM/AZ/AM | 250 | 330 | 19 |
| S280GD Z/ZM/AM | 280 | 360 | 18 |
| S300GD A/AM | 300 | 380 | 18 |
| S320GD Z/ZM/AM | 320 | 390 | 17 |
| S350GD Z/ZM/AZ/AM | 350 | 420 | 16 |
| S450GD A/AM | 450 | 480 | 15 |
| S550GD Z/ZM/AZ/AM | 550 | 550 | – |
Galvanized Surface Selection
| Type of Coating | Recommended Coating Weight |
| Aluminum-zinc Alloy | 30/40/50/60/75/90/100/150 |
| A: Coating quality50g/㎡,approximately equal to the coating thickness13.3pm | |
| Project | Classification | Symbol |
| Type of Coating | Aluminum-zinc Alloy | AZ |
| Surface Finish | Conventional Sequins | R |
| Minimize Sequins | M | |
| Skin Through | S | |
| Surface Treatment | Chromate Passivation | c |
| Non-chromate Passivation | C5 | |
| Chromate Passivationoiling | CO | |
| Chromium-free Passivationoiling | CO5 | |
| Anti-fingerprint | N | |
| Chromate-free/Anti-fingerprint | N5 | |
| No chromate high weather resistance fingerprint | NW | |
| Oil filling | 0 | |
| No treatment | U |
Material Comparison
| Chinese Standard | European Standards | American Standard | Japanese Standard |
| DC51D+AZ | DX51D+AZ | CS Type B, Type C | SGLCC |
| DC52D+AZ | DX52D+AZ | DS | SGLCD |
| S250GD+AZ | S250GD+AZ | 255 | – |
| S300GD+AZ | – | – | – |
| S350GD+AZ | S350GD+AZ | 345 | Class1 SGLC490 |
| S550GD+AZ | S550GD+AZ | 550 | SGLC570 |
