Galvalume Steel Coil

The primary difference lies in its coating layer. For the galvanized sheet, a layer of zinc material is averagely distributed on the surface of galvanized sheet, playing as a positive sheet protective to the base metal, in another word, zinc works as a substitute for corrosive-proof protecting the base metal until it is torn off.

While the galvalume sheet’s surface is a coating layer consisting of 55% aluminium, 43.5% zinc and other few elements, which appears a honeycomb structure under microscopic observation. Aluminium honeycomb wraps the zinc. Under such circustances, even though the coating of galvalume also plays its protective role as a positive sheet, however, such protection decrease sharply due to declining content of zinc and no easy electrolysis when zinc wrapped by aluminium.

Therefore, once the galvalume sheet is cut open, the verge of cut would be generally losing its protector and quickly go rusting. So we should cut as less as possible, once cutting happen, use anti-rusting paint or zinc-rich paint for protecting the verge, extending its lifespan.

Thermal Reflection:

People use it as a material for heat insulation for its thermal reflectivity is as high as twice the galvanized steel sheet.

Heat-resistance:

The galvalume steel coil could bear above 300℃ high temperatures with its good performance in heat resistance, quite similar to the aluminized steel sheet’s performance in oxidation resistance under high temperatures. It is often used for chimney pipes, ovens, illuminators, and fluorescent lamp covers.

Corrosive-resistance performance:

The essential of galvalume steel coil’s corrosive resistance lies at aluminium’s protective property. Once the zinc comes under abrasion, the aluminium would form a layer of densified oxidized aluminium, preventing the interior from further corrosion.

Economical:

The density of 55%AL-Zn is smaller than Zn, therefore, with the same weight and thickness of coating, the galvalume steel sheet is 3% larger in area than that of the galvanized steel sheet.

Easily painted:

There is perfect adhesiveness between the galvalume sheet and paint, saving the process of pre-treatment and weathering for painting work.

The coating material on the galvalume steel sheet is outstanding in its adhesiveness, which could be directly tarring on the advertising board and commonly used board with no pre-treatment such as a weathering process.

• The galvalume steel sheet’s surface is luxurious in silver-colored appearance.
• Galvalume steel sheets and galvanized steel sheets are similar in performance of processability and painting.

HS Code of Galvalume Steel Coil is 721049. Check tariffs before ordering from Japan.

The price of galvalume steel coil is affected by the price of raw material hot-rolled coils and the thickness, width, and AI-Zn coating weight.