Galvalume steel coil /Aluzinc steel coil
Galvalume steel (GL), also commonly known as Aluzinc steel coil, is a high-performance aluminum-zinc alloy coated steel produced by a hot-dip coating process using cold-rolled steel as the substrate. During manufacturing, the steel sheet passes through a molten alloy bath at approximately 600°C, forming a protective coating composed of about 55% aluminum, 43.4% zinc, and 1.6% silicon. This process creates a stable aluminum–iron–silicon–zinc microstructure on the steel surface.
The aluminum in the coating provides excellent barrier protection and heat resistance, while the zinc delivers electrochemical (sacrificial) corrosion protection. Because of this dual protection mechanism, Galvalume / Aluzinc steel coil offers significantly higher corrosion resistance and a longer service life than traditional galvanized steel, often lasting 2–6 times longer in many environments.
Due to its durability, heat reflectivity, and edge protection performance, Galvalume (Aluzinc) steel coil is widely used in metal roofing sheets, wall cladding panels, sandwich panels, appliances, and various construction and industrial applications where long-term corrosion resistance and structural reliability are required
Galvalume Steel Coil Specifications
| Thickness (mm)： | TC 0.13-1.2 |
| Width (mm)： | 600mm-1250mm |
| Coil weight (MT)： | 3.0-8.0 |
| AZ coating： | AZ30GSM-AZ180GSM |
| Coating Composition： | 55% Aluminum – 43.5% Zinc – 1.5% Silicon |
| Strength： | G250/G280/G300/G350/G550/ DX51D/DX52D |
| MOQ: | 25 tons per size |
| Payment term： | T/T; L/C at sight |
Galvalume vs Galvanized Steel
| Feature | Galvalume Steel | Galvanized Steel |
| Coating | Aluminum + Zinc | Zinc |
| Corrosion Resistance | 2–6× higher | Standard |
| Heat Reflectivity | Excellent | Medium |
| Service Life | 20–40 years | 10–20 years |
| Roofing Application | Excellent | Good |
Applications of Galvalume Steel Coil
Galvalume steel coil is widely used in construction and manufacturing industries.
Main applications include
Roofing Systems
Galvalume steel coil is widely used for metal roofing because it is lightweight, durable, and highly resistant to corrosion from rain, humidity, and snow.
Cladding and Wall Siding
Aluzinc steel coils are commonly used for building cladding and siding, providing strong weather protection and a modern, low-maintenance exterior finish.
Home Appliances
Galvalume steel coil is used in refrigerators, washing machines, and air conditioners because of its smooth surface, durability, and good formability.
Solar Energy Systems
Galvalume steel is used in solar panel frames and mounting systems due to its strength, weather resistance, and long service life.
Factory & Production
Siemens electrical control system
Ultra-long horizontal annealing furnace
Wet finishing design (skin- pass strength 5000kN）
German EMG correction CPC/EPC system
Advanced air knife system
Double-bending and tension-leveling ( wet leveling and straightening )process
9-stage cleaning system
Online X-Ray coating thickness measurement gauge
Double coating (passivate and AFP) and baking configuration
Quality Control
Reliable quality control is essential for producing high-performance Galvalume steel coils.
Our factory conducts strict inspection and testing during production, including:
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Coating thickness measurement
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T-bending test
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Pencil hardness test
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Salt spray corrosion test
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Surface inspection
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Mechanical property testing
Professional packaging and shipping
Proper packaging is essential to protect Aluzinc steel coils during transportation and storage.
Our standard export packaging includes:
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Waterproof paper protection
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Plastic film wrapping
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Galvanized steel sheet outer cover
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Edge protection rings
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Strong steel straps for fixing
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Wooden pallet or steel pallet support
This packaging method effectively prevents moisture, scratches, and deformation during long-distance sea transportation.
Coils can also be packaged according to customer requirements
Global Shipping Cases
Our Galvalume steel coils have been exported to customers worldwide, including roofing sheet manufacturers, construction companies, and steel distributors.
Typical export destinations include:
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South America – Peru, Chile, Colombia
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Middle East – UAE, Saudi Arabia
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Southeast Asia – Indonesia, Philippines, Vietnam
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Africa – Kenya, Nigeria, South Africa
The coils are commonly used for metal roofing sheets, wall cladding panels, sandwich panels, and steel structure projects.
With stable quality, competitive pricing, and reliable delivery, our Galvalume steel products have established long-term cooperation with many international customers.
FAQ About Galvalume Steel Coil
Here are the common questions that you may want to know.
What is Galvalume steel used for?
Galvalume steel is mainly used for roofing sheets, wall panels, sandwich panels, and appliances.
What is AZ150 coating?
AZ150 means the aluminum-zinc coating weight is 150 g/m².
Is Galvalume better than galvanized steel?
Yes. In most outdoor environments, Galvalume offers 2–6 times higher corrosion resistance.
Can Galvalume steel be painted?
Yes. It is widely used as the base material for PPGL (prepainted galvalume steel coil).
How to Get the Best Galvalume Steel Coil Price
To receive an accurate quotation, please provide the following information:
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Thickness
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Width
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Coating weight (AZ50 / AZ100 / AZ150)
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Coil weight
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Order quantity
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Destination port
Our sales team will provide a fast quotation within 12 hours