S220GD+AZ galvalume steel coil is a premium hot-dip aluminum-zinc coated structural steel compliant with EN 10346:2015, featuring a 55% Al-43.4% Zn-1.6% Si alloy coating and a minimum yield strength of 220 MPa. Engineered for structural applications demanding high strength, superior corrosion resistance, and excellent formability, this S220GD+AZ Aluzinc steel coil delivers 3–6 times longer service life than conventional galvanized steel, making it the ideal choice for construction, HVAC, and light structural projects. As a core product of GNEE STEEL, our S220GD+AZ galvalume coil adheres to strict international standards, ensuring consistent quality and reliable performance for global buyers.
S220GD+AZ steel chemical composition
| Grade | Material No. | C | Si | Mn | P | S |
| S220GD+AZ | 1.0241+AZ | 0.20 | 0.60 | 1.70 | 0.10 | 0.045 |
S220GD+AZ steel steel Mechanical properties
| Grade | Material No. | Yield Strength MPa min |
Tensile strength MPa min | Elongation A80 min |
| S220GD+AZ | 1.0241+AZ | 220 | 300 | 20 |
Key Advantages of S220GD+AZ Galvalume Steel Coil
Exceptional Corrosion Resistance: The 55% aluminum-zinc coating combines aluminum's barrier protection, zinc's sacrificial cathodic action, and silicon's alloy-layer control, resisting rust and oxidation in harsh atmospheric, humid, and mildly corrosive environments.
High Structural Strength: Minimum yield strength of 220 MPa and tensile strength of 300–440 MPa ensure robust load-bearing capacity for structural framing, purlins, and roll-formed sections.
Excellent Formability & Weldability: Elongation at break ≥20% enables seamless cold forming, bending, stamping, and welding, reducing processing costs and improving production efficiency.
Superior Heat Resistance & Reflectivity: Withstands temperatures up to 315°C without coating degradation; high heat reflectivity lowers building energy consumption, ideal for roofing and wall cladding.
Cost-Effective Long-Term Performance: Durable silver-white surface requires minimal maintenance; long service life reduces replacement frequency, delivering optimal total cost of ownership.
Aluzinc Coating Specification Chart
| Coating code: AZ50 / AZ70 / AZ100 / AZ150 / AZ180 / AZ200 | ||||
| Coating Code | Total Coating Weight | Total Coating Thickness | Approx. Single Side Thickness(μm) | Applicable Standards |
| (g/m², both sides) | (μm, theoretical) | |||
| AZ50 | 50 | 13.16 | 6.58 | GB/T 14978, EN 10346, ASTM A792 |
| AZ70 | 70 | 18.42 | 9.21 | GB/T 14978, EN 10346, ASTM A792 |
| AZ100 | 100 | 26.32 | 13.16 | GB/T 14978, EN 10346, ASTM A792 |
| AZ150 | 150 | 39.47 | 19.74 | GB/T 14978, EN 10346, ASTM A792 |
| AZ180 | 180 | 47.37 | 23.68 | GB/T 14978, EN 10346, ASTM A792 |
| AZ200 | 200 | 52.63 | 26.32 | GB/T 14978, EN 10346, ASTM |
Applications of S220GD+AZ Galvalume Steel Coil
The S220GD+AZ galvalume steel coil is versatile across industries, leveraging its strength and corrosion resistance:
Construction: Roofing, wall cladding, purlins, structural framing, gutters, and downspouts.
HVAC & Appliances: Air conditioning components, ventilation ducts, and appliance back panels.
Agriculture: Farm buildings, silos, and agricultural equipment parts.
Light Industry: Storage racks, highway guardrails, and electrical enclosures.
Frequently Asked Questions (FAQ)
What does S220GD+AZ mean?
S220GD = structural steel with minimum 220 MPa yield strength; +AZ = hot-dip aluminum-zinc (galvalume) coating (55% Al, 43.4% Zn, 1.6% Si).
What is the difference between S220GD+AZ and S220GD+Z?
S220GD+AZ has an aluminum-zinc coating (better corrosion/heat resistance); S220GD+Z has a pure zinc coating (lower cost for mild environments).
What is the service life of S220GD+AZ galvalume steel coil?
20–25 years in normal atmospheric environments, 3–6 times longer than galvanized steel.
Can S220GD+AZ be painted directly?
Yes, it has excellent paint adhesion; can be painted without pre-treatment or weathering.
What is the maximum temperature resistance of S220GD+AZ?
Withstands continuous temperatures up to 315°C without coating peeling or discoloration.
Is S220GD+AZ suitable for coastal areas?
Yes, its high aluminum content provides superior resistance to salt spray and marine corrosion.
What are the available coating masses for S220GD+AZ?
Standard options: AZ30, AZ50, AZ70, AZ100, AZ150, AZ200, AZ275 g/m²; customizable per request.
What is the delivery time for S220GD+AZ galvalume steel coil?
15–25 days after receiving the deposit, depending on order quantity and customization requirements.
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