Products Description
S250GD+AZ Galvalume Steel Sheet is a premium structural-grade aluminum-zinc alloy coated steel, engineered for exceptional durability, high strength, and superior corrosion resistance. Manufactured via hot-dip process with 55% Al, 43.5% Zn, and 1.5% Si coating, this sheet delivers 3–6 times longer service life than conventional galvanized steel, making it ideal for construction, roofing, siding, and industrial applications. As a core product of GNEE STEEL, it balances structural performance, formability, and cost-effectiveness for global buyers.
Key Features of S250GD+AZ Galvalume Steel Sheet
Superior Corrosion Resistance: The 55% Al-Zn-Si alloy coating forms a dense protective layer, resisting rust, oxidation, and chemical erosion in coastal, industrial, and humid environments.
High Structural Strength: Minimum yield strength of 250 MPa and tensile strength of 330 MPa ensure reliable load-bearing capacity for structural applications.
Excellent Formability: Good ductility (elongation ≥19%) enables easy bending, stamping, and rolling without cracking, suitable for complex components.
Heat & UV Resistance: Withstands high temperatures up to 300°C, maintaining stability and reflectivity for energy-efficient roofing and siding.
Smooth Surface & Aesthetics: Bright silver spangle finish with high flatness, ready for painting or direct use in decorative applications.
Eco-Friendly: Chromate-free coating complies with environmental standards, ensuring safe use and recyclability.
Technical Specifications
1. Chemical Composition (Substrate & Coating)
| Element | Substrate (S250GD) | Coating (AZ) |
|---|---|---|
| C | ≤0.20% | - |
| Si | ≤0.60% | 1.5% |
| Mn | ≤1.70% | - |
| P | ≤0.10% | - |
| S | ≤0.045% | - |
| Al | - | 55% |
| Zn | - | 43.5% |
2. Mechanical Properties
| Property | Value | Standard |
|---|---|---|
| Yield Strength (Rp0.2) | ≥250 MPa | EN 10346 |
| Tensile Strength (Rm) | 330–510 MPa | EN 10346 |
| Elongation (A50) | ≥19% | EN 10346 |
3. Dimensions & Coating Options
| Parameter | Range |
|---|---|
| Thickness | 0.25–3.0 mm |
| Width | 600–1500 mm |
| Length | Customized (1000–6000 mm) |
| Coating Weight | AZ50–AZ150 g/m² (both sides) |
| Surface Finish | Regular spangle, minimized spangle, bright |
Applications
S250GD+AZ Galvalume Steel Sheet serves diverse industries with high-performance demands:
Construction: Roofing, wall cladding, structural frames, purlins, and floor decks.
Industrial: Warehouse panels, equipment enclosures, HVAC components, and solar mounting structures.
Automotive: Chassis parts, body panels, and structural reinforcements.
Agriculture: Barns, sheds, and farming equipment.
Appliances: Back panels, cabinets, and metal components.
Aluzinc Coating Specification Chart
| 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 |
Frequently Asked Questions (FAQ)
1. What does S250GD+AZ mean?
S: Structural steel; 250: Minimum yield strength 250 MPa; GD: Hot-dip coated; +AZ: 55% Al-Zn alloy coating.
2. How long does S250GD+AZ Galvalume steel last?
Up to 25–30 years in normal environments and 15–20 years in coastal/industrial areas, 3–6 times longer than galvanized steel.
3. Can S250GD+AZ be painted?
Yes, it has excellent paint adhesion. Properly cleaned and primed surface supports various coatings for enhanced protection and aesthetics.
4. What coating weights are available?
Standard options: AZ50, AZ70, AZ90, AZ120, AZ150 g/m² (custom weights available).
5. Is S250GD+AZ suitable for marine environments?
Yes, the high aluminum content provides superior resistance to saltwater corrosion, ideal for coastal buildings and marine equipment.
6. What is the difference between Galvalume (AZ) and Galvanized (Z)?
Galvalume (55% Al-Zn) has better corrosion resistance, heat resistance, and reflectivity than galvanized (100% Zn), with longer service life.
7. Can you provide samples for testing?
Yes, free small samples (100×150 mm) are available upon request for quality verification.
8. What is the delivery time?
7–15 days for standard inventory; 15–25 days for customized specifications, depending on order quantity.
S250GD+AZ Galvalume Steel Sheet is your ultimate choice for high-strength, corrosion-resistant, and cost-effective structural steel solutions. Whether you need standard sizes or customized specifications, GNEE STEEL delivers top-quality products and reliable service to help your projects succeed.
Don't miss the chance to upgrade your materials with our core product! Contact us today to get the latest price list, technical datasheet, and free samples. Our professional team is ready to support your inquiries and provide tailored solutions for your business needs.
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