Zinc-aluminum-magnesium-coated steel sheets (also known as ZAM or galvanized aluminum-magnesium alloy steel sheets) are a new generation of highly corrosion-resistant coated products developed by adding alloying elements such as aluminum and magnesium to the hot-dip galvanizing process. The zinc in the coating provides sacrificial protection, aluminum forms a dense passivation film, and magnesium activates the alloy coating, working synergistically to enhance corrosion resistance.
Depending on the alloy composition, these coatings are primarily classified into the following systems:
| Zinc-Aluminum-Magnesium Coated Steel Coil Technical Data Sheet | |
|---|---|
| Product Name | Zinc-Aluminum-Magnesium Coated Steel Coil (ZAM Coated Steel Coil) |
| Applicable Standard | YB/T 4761-2019 “Continuously Hot-Dip Zinc-Aluminum-Magnesium Alloy Coated Steel Sheet and Strip” |
| Coating Composition Systems | |
| Low Al-Mg | Zn-(1.5-2.5)%Al-(1-2)%Mg (ZM) | 6-10x vs. Galvanized Steel |
| Medium Al-Mg | Zn-(4-7)%Al-(2-4)%Mg (AM) | 8-12x vs. Galvanized Steel |
| High Al-Mg | Zn-(10-12)%Al-(2-4)%Mg (AM) | 10-15x vs. Galvanized Steel |
| Al-Zn-Mg | Al-43.5%Zn-1.5%Si-(1.5-2)%Mg (AZM) | 10x vs. Galvalume Steel |
| Steel Grades | |
| Low Carbon Steel | DC51D+ZM, DC52D+ZM, DC53D+ZM (Commercial, forming, deep drawing quality) |
| Structural Steel | S250GD+ZM ～ S550GD+ZM (Yield strength 250-550MPa) |
| Low Alloy High Strength | HC260LAD+ZM ～ HC340LAD+ZM |
| Dual Phase Steel | HCT450X+ZM, HCT590X+ZM |
| Dimensional Specifications | |
| Thickness | 0.20mm – 6.0mm |
| Width | 700mm – 1600mm |
| Coating Weight (Both Sides) | 40 – 800 g/m² |
| Common Coating Weights | 60/60, 75/75, 90/90, 100/100, 125/125, 150/150 g/m² |
| Coil ID | 508mm / 610mm |
| Surface Treatment | |
| Treatment Types | C5 (Chrome-free passivation) / CO5 (Passivation + Oiling) / N5 (Anti-fingerprint) / O (Oiling) / U (No treatment) |
| Performance Advantages | |
| Corrosion Resistance | 6-15x longer than traditional galvanized steel |
| Cut-edge Self-healing | Forms protective film on cut edges, automatically repairs exposed substrate |
| High Temperature Resistance | Withstands up to 380°C |
| Formability | Excellent stamping, bending and welding properties |
| Main Applications | |
| Industries | Solar Industry, Construction, Home Appliances, Automotive, Electrical Industry, Agriculture |
| Packaging & Delivery | |
| Packaging | Standard export packaging: inner kraft paper + waterproof film + outer galvanized steel sheet + steel straps |
| Lead Time | 7-35 days |
| Payment Terms | T/T (30% deposit + 70% balance), L/C at sight |
