Coated Steel Plates: Aluminum-Plated Steel

Overview

Coated steel plates, especially aluminum-plated steel, offer strong corrosion resistance. They are made from pure aluminum or an aluminum alloy with 5–10% silicon. These materials resist gases like SO₂, H₂S, and NO₂. They also provide excellent oxidation resistance and heat reflection. Due to these properties, they are widely used in automobile exhaust systems, heating furnaces, and construction.

Aluminized steel offers similar benefits. It is highly durable and protects against corrosion, making it ideal for demanding applications.

Production Methods

Hot-Dip Method

This method was first introduced in the U.S. in 1930. It is similar to hot-dip galvanizing but requires higher temperatures due to aluminum’s melting point and reactivity. The tank temperature is maintained between 670–710°C to prevent slag formation. Silicon (5–10%) is added to improve plasticity.

Two types of coated plates (Type I and Type II) are produced. Their alloy layers range from 70–150 g/m². The price of aluminized steel depends on the coating method and alloy content.

Electrophoretic Method

Developed in the U.K. in 1962, this process evenly applies aluminum powder to steel using electrophoresis. The material is then rolled and sintered, creating a non-porous aluminum layer. This improves formability.

While the hot-dip method is more economical, research continues in the U.S. to develop Al-Zn-Si and Al-Ti alloy coatings for better heat and corrosion resistance. Advanced coating technologies help suppliers improve performance in harsh environments.

Other Coated Steel Sheets

Lead-Tin Alloy-Coated Steel

This steel is known for corrosion resistance and lubricity. It is used in automobile fuel tanks and TV chassis. It is produced using hot-dip and electroplating methods, offering different alloy thicknesses.

Organic Coated Steel Sheets

These sheets have organic coatings or plastic films. They offer protection and aesthetic appeal. They are commonly used in construction and industrial products. Roller coating and lamination are the main production methods.

Conclusion

Coated steel sheets, also called plated steel sheets, come with different coatings, including Sn, Zn, Al, Cr, Pb-Sn alloys, and organic coatings. These coatings enhance corrosion resistance, making them suitable for industrial use.

For those needing aluminized steel, it offers durability at a competitive price. Reputable suppliers provide various coated steel options to meet diverse needs.