Galvalume Steel Coil Product Information
| Item | Content Example |
|---|---|
| Product Name | Continuous Hot-Dip Galvalume Steel Strip/Coil |
| Standard | GB/T 14978-202X ( China) / JIS G 3321 ( Japan) / ASTM A792 ( USA) |
| Grade | DX51D+AZ ( General Use), S350GD+AZ ( Structural Use) |
| Size | Thickness: 0.5mm – 3.0mm; Width: 1000mm / 1219mm / 1250mm |
| Coating Designation | AZ150 (Coating weight both sides: 150g/m²), AZ120, AZ100 |
| Surface Treatment | Chromate Passivation (C),Oiling (O),Untreated (U), Anti-fingerprint |
Galvalume Steel Coil, commonly referred to as Aluminum-Zinc Alloy Coated Steel Coil, is manufactured by applying an alloy coating consisting of 55% aluminum, 43.4% zinc, and 1.6% silicon onto a cold-rolled steel substrate. This material combines the high corrosion resistance and heat resistance of aluminum with the cut-edge protection of zinc, forming a composite coating structure that offers both physical barrier protection and electrochemical sacrificial protection.
Key Advantages:
Aluminum’s role: Forms a dense aluminum oxide barrier layer on the surface, effectively isolating corrosive media
Zinc’s role: Provides sacrificial anode protection at cut edges and scratches, preventing red rust propagation
Silicon’s role: Inhibits excessive growth of the alloy layer, ensuring coating adhesion
