Galvanized vs Aluminized vs Galvalume Steel: Which Coated Steel Should You Import?
Galvanized vs Aluminized vs Galvalume: which coated steel should you import?
Direct answer: choose galvanized (Z) for lowest cost and best formability in fencing, tubes and general roofing; choose aluminized (AS) for heat-exposed parts such as exhaust systems and oven panels; choose Galvalume (AZ, 55% Al-Zn) when long-term atmospheric corrosion resistance matters most, such as roofing, wall cladding and agricultural buildings.
| Property | Galvanized (Z) | Aluminized (AS) | Galvalume (AZ) |
|---|---|---|---|
| Coating chemistry | Pure zinc | Al-Si alloy (Type 1) | 55% Al-Zn-Si |
| Atmospheric corrosion resistance | Good | Moderate (edge rust risk) | Excellent — typically 2-6× plain zinc |
| Heat resistance | Limited (≈230°C service) | Excellent (exhaust-grade) | Good (≈300°C service) |
| Cut-edge / scratch protection | Strong sacrificial action | Weaker | Strong self-sacrificing edges |
| Formability & welding | Excellent | Good (weld with care) | Good |
| Relative price | Lowest | Low-mid | Mid |
| Typical uses | Fencing, tubes, roofing | Exhaust, ovens, heat shields | Roofing, cladding, farm buildings |
How MESCO helps you decide
MESCO produces and exports all three coating families, so the recommendation is based on your project environment — not on which product we need to move. Send your application, thickness range and target service life, and we reply with a coating-type suggestion and quotation within 24 hours on business days.
Rule of thumb: general construction → GI; heat exposure → AS; maximum outdoor life → GL.
