Coated Steel Sheets and Aluminized Sheets

Introduction

Coated steel sheets, including aluminized sheets, are widely used for their corrosion resistance and durability. These sheets are coated with pure aluminum or aluminum alloy containing 5-10% silicon, providing excellent protection against gases like SO₂, H₂S, and NO₂. They also offer superior oxidation resistance and heat reflectivity, making them ideal for automotive exhaust systems, heating furnaces, and construction materials. Aluminized suppliers provide these materials for various industrial applications.

Production Methods

Hot-Dip Aluminized Sheet Plating

Hot-dip aluminized sheet plating, first introduced in the U.S. in 1930, follows a process similar to the Sendzimir hot-dip galvanizing method. Since aluminum has a high melting point and reacts easily with iron, the tank temperature is maintained at 670-710°C to prevent slag formation. To enhance plastic processing, 5-10% silicon is added, reducing the alloy layer’s thickness. Two types of coated steel sheets, Type I and Type II, are produced, typically with a coating weight of 70-150 g/m².

Electrophoretic Aluminized Sheet Plating

Developed in the UK in 1962, this method applies aluminum powder to the steel sheet surface using electrophoresis, followed by rolling and sintering to form a non-porous aluminum layer. This process improves formability. While hot-dip aluminized sheets remain cost-effective, research in the U.S. has led to the development of Al-Zn-Si and Al-Ti alloy-coated steel sheets, offering better corrosion and heat resistance.

Other Types of Coated Steel Sheets

Lead-Tin Alloy-Coated Steel Sheets

Lead-tin alloy-coated sheets, such as terne-coated sheets, offer excellent corrosion resistance and lubricity. They are commonly used in automotive fuel tanks and TV chassis. These sheets are manufactured through hot-dip or electroplating methods, with different alloy layer thickness options.

Organic Coated Steel Sheets

Organic coated steel sheets feature a protective organic layer or plastic film, improving durability and appearance. These are widely used in construction materials and industrial applications. The main production methods include roller coating and lamination.

Types of Coated Steel Sheets

Coated steel sheets, also called plated steel sheets, are low-carbon steel sheets with protective coatings. Common types include:

• Tin-Plated Sheets
• Tin-Free Steel Sheets
• Galvanized Steel Sheets
• Aluminized Sheets
• Lead-Tin Alloy Steel Sheets
• Organic Coated Steel Sheets

Each type is designed to meet specific corrosion resistance, durability, and application requirements across various industries. Aluminized suppliers play a crucial role in providing these materials for manufacturing and infrastructure projects.