Introduction to Aluminized Steel Sheet

Aluminized steel sheet is a type of steel sheet coated with an aluminum-silicon alloy, containing 90% aluminum and 10% silicon. This combination provides several performance benefits:

1. Heat Resistance

Aluminized steel sheets offer superior heat resistance compared to galvanized and cold-rolled steel sheets. An iron-aluminum alloy forms from the specific combination of the steel substrate and the coating structure, enhancing high-temperature resistance.

At around 450℃, high reflectivity is maintained.
The sheet retains its luster at temperatures up to 550℃.
Above 600℃, iron and aluminum diffusion causes the surface to darken, but the high melting point of the metal layer prevents melting.

The heat resistance of aluminized steel (500-600℃) is nearly equivalent to stainless steel, outperforming cold-rolled steel by over 20 times.

2. Heat Reflection

The surface of aluminized steel sheets has excellent heat reflection.

At temperatures below 500℃, light reflectivity is approximately 80%.
Infrared reflectivity reaches up to 95%.

This makes aluminized sheets ideal for creating heat insulation barriers and heat reflectors in high-temperature applications, facilitating quick temperature increases in furnaces through effective heat reflection.

3. Corrosion Resistance

Aluminum has higher resistance than Mn, Mo, Cr, W, Cd, Fe, and Zn in the ion series. The aluminum oxide film formed during the hot-dip plating process provides stable corrosion resistance.

The Al2O3 protective layer passivates the steel surface, offering robust chemical corrosion resistance.
Even if scratched, the layer’s self-healing properties maintain protection.

4. Environmental Performance

Aluminized steel sheets are composed of aluminum, silicon, and iron.

Tests confirm compliance with the Food Sanitation Law, making them safe for direct food processing.
Aluminized sheets are environmentally friendly and fully recyclable, with no harm to human health.

5. Processability

The presence of an iron-aluminum alloy can impact processability compared to cold-rolled and galvanized steel sheets. However, using appropriate processing methods can achieve results similar to other steel sheets.

6. Weldability

Welding conditions differ from cold-rolled steel sheets:

Aluminum’s softness aids in combining and conducting heat, improving heat dissipation in the welded area.
The coating’s higher melting point compared to galvanized steel reduces flow, requiring less current during welding.

7. Coating Performance

To stabilize adhesion when coating aluminized steel, chemical film pre-treatment is needed.

8. Surface Appearance

Aluminized steel is produced using the “gas wiping method” for molten coating.

It offers long-lasting gloss, improved corrosion resistance, and enhanced weathering resistance compared to previous roller coating methods, with no embossing for a smooth finish.

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Introduction to Aluminized Steel Sheet