Galvalume is a kind of coating consisting of 43.4% zinc, 1.6% silicon, and 55% aluminum that performs the role of protecting metals from oxidation. The Al-Zn layer offer galvalume steel many advantages. Keep reading for more details!
Galvalume Steel Coil: Features
- Excellent resistance to corrosion
The corrosion resistance of galvalume products is mainly associated with the protective functions of aluminum. When the zinc actually starts to degrade, the aluminum will form a thick alumina layer which prevents further corrosion of the materials inside. Its corrosion resistance is even 3 times that of galvanized sheet.
- High heat reflectivity
The thermal reflectivity of GL sheet is very high, twice that of galvanized steel sheet, and it is often used as a thermal insulation material. Therefore, the GL roofing sheet is suitable for the heat climate.
- Great heat resistance
Galvalume steel has impressive heat resistance that will withstand temperatures that exceed 300 degrees (315℃). So it is often used in chimney pipes, ovens, luminaires, and fluorescent lampshades.
- Appealing appearance
The surface of the GL steel sheet is smooth with beautiful and uniform spangles, and the base color is silver-white. So it can be used as building exterior panels.
Besides, the GL coating has good adhesion to the paint film so that it can be the substrate for PPGL steel. Also, it has good processing performance. Therefore, it can be punched, sheared, welded, etc. for other uses.
But it also has some disadvantages, for example,
1. High Cost
GL coil is more expensive than galvanized, HR, CR coils in the market. The ability to resist corrosion, the final condition of the product, and the addition of Al-Zn material all keep its price high.
2. Thickness Limit
The option of coating thickness and coil thickness is limited. The sheet thickness ranges between 0.2 and 4mm generally. And in terms of coating, it can only achieve a minimum of 30 grams per square and a maximum of 220 grams per square.
3. Not-suited for Livestock Facilities
The GL coil is widely used in building materials, household appliances, automobiles, machinery, ships, and so on. But it should not be used for animal confinement spaces. Why? Animal waste does not go well with any type of material, galvalume coil will corrode exceptionally faster than galvanized metal when exposed to animal urine.
More Tips for You
Storage: Place GL steel coils and sheets indoors such as warehouses, and keep the storage area dry and ventilated. And do not store it for a long time in an acidic environment. When storing outdoors, it is necessary to prevent rain and avoid condensation caused by oxidation stains.
Transportation: To avoid external impact, use a skid to support steel coils on the transportation tools to reduce stacking and take rain-proof measures.
Galvalume steel has its advantages and disadvantages. It has been widely used around the world replacing galvanized steel sheets. At Wanzhi Steel, we have a hot-dip galvalume line to offer you quality products. We have a full-quality test system. Also, our products can be tested by third parties if required. Welcome to contact us for details!