Galvalume steel coil
Galvalume steel coil is coated with an aluminium-zinc alloy (nominally 55% aluminium, 43.4% zinc, 1.6% silicon), giving roughly two to four times the corrosion resistance of standard galvanized steel at similar coating mass. GNEE STEEL supplies Galvalume coil in the 0.1-1.2 mm range (and broader 0.12-6.0 mm), width 600-1500 mm, to EN 10147, JIS G3321, ASTM A792, and related standards.
Galvalume combines the barrier protection of aluminium with the sacrificial protection of zinc. The aluminium forms a stable, adherent oxide that resists weathering; the zinc protects cut edges and scratches. This makes Galvalume the preferred substrate where long service life and appearance matter but cost must stay below stainless.
Composition and Standards
Coating: 55% Al - 43.4% Zn - 1.6% Si (AZ coating)
Standards: EN 10147, EN 10142, DIN 17162, JIS G3302, ASTM A653/A792
Coating mass: 30-275 g/m2 (AZ equivalents)
Specification
| Item | Detail |
| Thickness | 0.1 - 1.2 mm (broader 0.12-6.0 mm) |
| Width | 600 - 1500 mm |
| Coating | 30-275 g/m2 (AZ) |
| Surface | Normal, minimized, spangle-free |
| Coil weight | 3-20 MT |
| Coil ID | 508 / 610 mm |
| Quality | SGS, ISO |
Detailed Applications
Roofing and wall cladding: The top choice for long-life building envelopes.
Appliances: Oven and water-heater shells needing heat and corrosion resistance.
Automotive: Heat shields and underbody components.
HVAC: Ducts and outdoor units.
General fabrication: Any part exposed to weather.
Galvalume vs Galvanized
Galvalume resists corrosion two to four times longer than equal-mass galvanized steel, especially at cut edges and in coastal or industrial atmospheres, though it can show edge creep if the cut is unprotected. For painted use, it is an excellent PPGL substrate.
Surface and Spangle
Normal, minimized, or spangle-free surfaces are available; spangle-free is preferred for painting and visible finishes.
Purchasing Guide
Specify coating type (AZ), coating mass, thickness, width, surface, and coil requirements. GNEE STEEL supports customized dimensions and export packaging.
Quality and Inspection
Produced under ISO/SGS-documented quality; third-party inspection can be arranged before shipment.
Application Examples
Galvalume coil is the preferred skin for long-life metal roofs and wall panels, especially in coastal and industrial atmospheres where ordinary galvanized steel would corrode faster. Appliance makers use it for oven and water-heater shells, and HVAC builders form outdoor units from the same coil. Its reflective surface also helps with thermal performance, and because the aluminium in the coating slows corrosion while zinc protects edges, Galvalume often outlasts galvanized steel by a wide margin in the same location, making it a cost-effective upgrade where re-roofing is expensive.
Coating Care
Store coils dry and covered. For painted use, request a conversion-treated, spangle-free surface and validate the color chip first. Protect cut edges with edge paint or detailing to limit edge creep, and the Galvalume layer will deliver years of maintenance-free service in demanding environments.
Sourcing Tip
When comparing offers, confirm the AZ coating mass and that the surface is spangle-free if painting is planned. GNEE STEEL provides mill and inspection documents so your team can verify the alloy coating before the coil enters production. This keeps your production line running smoothly and protects finished quality.
FAQ
Q: What is Galvalume made of?
A: A 55% aluminium - 43.4% zinc - 1.6% silicon coating.
Q: How does it compare to galvanized?
A: 2-4x the corrosion resistance at similar coating mass.
Q: What standards apply?
A: EN 10147, JIS G3321, ASTM A792, and related.
Q: What thickness is typical?
A: 0.1-1.2 mm for this line; broader 0.12-6.0 mm available.
Q: Is it paintable?
A: Yes, it is a common PPGL substrate.
Q: How should cut edges be protected?
A: Use edge paint or detailing; aluminium-zinc creeps slowly.
Q: What is the coil weight?
A: 3-20 metric tons per coil.
Q: Do you provide inspection?
A: SGS/ISO quality with third-party inspection on request.
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