The Secret of Aluminum Plates: Why Are They So Durable?

Aluminum plates, also known by various names such as aluminum-coated steel plate, aluminized plate, and hot-dip aluminized plate, are widely used in automotive parts, thermal equipment, and building materials. Despite their technical name, these plates have impressive durability and heat resistance.

What Is Aluminum-Coated Steel Plate?

Simply put, an aluminum-coated steel plate is a steel plate coated with an aluminum-silicon alloy, with 90% aluminum and 10% silicon. This combination provides excellent heat resistance, reflectivity, and corrosion resistance. Its mechanical and physical properties surpass those of cold-rolled steel plates.

Why “Hot-Dip Aluminum-Coated Steel Plate”?

The term “hot-dip” refers to the similar manufacturing process used in hot-dip galvanized steel plates. However, aluminum-coated steel plates are far more heat-resistant. During the hot-dip process, the steel plate forms an iron-aluminum alloy due to the coating structure, which greatly enhances its performance at high temperatures. For example:

• At 450°C, the plate maintains high reflectivity.
• At 480°C, although the coating may appear gray, the protective layer remains intact.
• At 650°C, the protective layer continues to prevent oxidation of the steel.

Corrosion Resistance and Self-Healing

During the hot-dip process, molten aluminum reacts with air to form a stable Al2O3 protective layer. This layer passivates the steel plate’s surface, making it resistant to chemical corrosion. Even if the surface is scratched later, this layer has a self-healing function, ensuring the plate retains its durability.

Applications of Aluminum-Plated Steel Plates

Due to their exceptional performance, aluminum-coated steel plates are used in various products requiring corrosion protection and heat resistance. Common applications include car mufflers, household appliances, oven liners, rice cooker liners, wall-mounted furnaces, and bread makers.

Specifications and Brands

The thickness of aluminum-plated plates ranges from 0.3 to 3.0 mm, with widths between 600 and 1250 mm. Popular brands include Japan’s SA1C and SA1D, South Korea’s brands, and domestically produced DX51+AS and DX53D+AS.

Conclusion

Aluminum-coated steel plates are essential in both industrial and everyday applications. Their durability and heat resistance make them the material of choice for many products. Next time you come across the term “aluminized sheet,” you’ll have a better understanding of its significance and benefits.