Zinc Aluminum Alloy Coated Steel
55% Al-Zn Coated Steel
Superior anti-corrosion performance for long-lasting durability. Zinc aluminum alloy coating provides edge protection and self-healing properties. Perfect for roofing sheets, structural components, and outdoor applications. Get factory price and fast delivery.
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Description
Zinc Aluminum Alloy Coated Steel is a high-performance coated steel product manufactured by applying a zinc-aluminum alloy coating to a steel substrate through a continuous hot-dip process. This advanced coating provides superior corrosion resistance, excellent formability, and enhanced durability compared to conventional galvanized steel.
1.Common Product Types
Galvalume / Aluzinc: Coating composition – 55% aluminum, 43.4% zinc, 1.6% silicon (55% Al-Zn)
ZAM: Coating composition – zinc, aluminum and magnesium (e.g., Zn-6%Al-3%Mg)
GL (Galvalume): Aluzinc-coated steel sheet
2.Product Structure
| Structure Layer | Description |
|---|---|
| Top Coat (Optional) | Pre-coated layer (PPGL) or anti-fingerprint treatment |
| Chemical Passivation Layer | Chromate-free or chromated passivation for enhanced corrosion resistance |
| Zn-Al-Mg Alloy Coating | 55% Al-Zn or Zn-Al-Mg alloy coating |
| Substrate | Cold-rolled steel (DX51D, DX52D, S250GD+Z, etc.) |
| Item | Specification Range |
|---|---|
| Thickness | 0.12 mm – 3.0 mm |
| Width | 600 mm – 1500 mm (customizable up to 1800 mm) |
| Coil Weight | 3 – 15 tons per coil |
| Coating Type | 55% Al-Zn (Galvalume), Zn-Al-Mg (ZAM) |
| Coating Weight | AZ30 – AZ200 (30–200 g/m²) |
| Substrate Grade | DX51D, DX52D, DX53D, S250GD – S550GD |
| Surface Treatment | Passivation, anti-fingerprint, oiled, non-oiled |
| Surface Finish | Regular bright surface, zero spangle, mini spangle |
4.Product Features & Advantages
| Features | Advantage Description |
|---|---|
| Excellent Corrosion Resistance | Corrosion resistance is 2–6 times that of ordinary galvanized steel; salt spray test can last more than 1000 hours. |
| Good High Temperature Resistance | Can be used continuously at 300℃ without obvious discoloration. |
| Excellent Formability | Strong coating adhesion; suitable for stamping, bending, deep drawing, roll forming, etc., without chalking or peeling. |
| Outstanding Scratch Resistance | High coating hardness and good surface wear resistance, reducing scratches during processing. |
| Cut Edge Self-Healing Ability | Zn-Al-Mg coating forms a dense protective film at cut edges to prevent red rust. |
| Aesthetic & Durable | Bright silver-white metallic luster for long-lasting appearance. |
| Environmental Friendly | Complies with RoHS directives; chromate-free eco-friendly passivation available upon request. |
5.Quality Standards & Certifications
| Standard System | Standard No. |
|---|---|
| Chinese Standard | GB/T 14978 – 2015 |
| American Standard | ASTM A792 |
| European Standard | EN 10346 / EN 10215 |
| Japanese Standard | JIS G3321 |
Certificates:
ISO 9001, ISO 14001, CE Certification, SGS Test Reports
6.Packaging & Transportation
Middle layer: Circumferentially wrapped with galvanized iron sheet or steel plate
Outer layer: Reinforced with steel strips longitudinally and circumferentially
Bottom: Fumigated wooden pallets for easy forklift loading and unloading
FOB (Tianjin / Shanghai / Qingdao and other ports), CIF, CFR, EXW
T/T (Telegraphic Transfer), L/C (Letter of Credit)
7–15 days for regular products; 20–45 days for customized products
