168/188mm AZ150 AFP Aluzinc Steel used for Truss Frame AS1397 G550 Structural Grade 55% Galvalume Slit Coils

Introduction of Galvalume / Aluzinc Steel Coil and Slitted Strip Coils

The surface of the Galvalume / Aluzinc steel sheet presents a unique smooth, flat, and gorgeous spangle looking, with a silver white base color. The special coating structure gives it excellent corrosion resistance. The normal service life of Galvalume / Aluzinc Steel Sheet and Coils can reach 25 years, and they have good heat resistance and can be used in high-temperature environments at 315 ℃; The adhesion between the coating and the paint film is good, and it has good processing performance, which can be used for stamping, shearing, welding, etc; The surface conductivity is very good.

The coating consists of 55% aluminum, 43.5% zinc, and 1.5% silicon in weight ratio, respectively. The production process of aluminum zinc steel sheet is similar to that of galvanized steel plate and aluminum plated plate, and it is a continuous melting coating process. 55% aluminum zinc alloy coated aluminum zinc steel plate has superior corrosion resistance compared to galvanized steel plate of the same thickness when exposed to the same environment on both sides. 55% aluminum zinc alloy coated aluminum zinc steel ( 55% Alu-zinc Steel) plate not only has good corrosion resistance, but also color coated products have excellent adhesion and flexibility.

Why 55% Aluzinc Steel is Commonly Used for Light Steel Building Frames

55% Aluzinc steel (also known as Galvalume steel) is a type of steel that has been coated with an alloy of 55% aluminum, 43.4% zinc, and 1.6% silicon. This combination provides a highly durable and corrosion-resistant material, making it ideal for a variety of applications, especially in light steel building frames.

Here are several reasons why 55% Aluzinc steel is favored in light steel construction, especially in regions like Australia: 

1. Superior Corrosion Resistance

• Enhanced Durability: The 55% Aluzinc coating offers significantly better corrosion resistance compared to traditional galvanized steel (which typically has a zinc coating). The aluminum content in the alloy helps to form a protective oxide layer that resists rust and extends the lifespan of steel products, even in harsh environments.

• Longer Service Life: Aluzinc steel is up to 3 times more corrosion-resistant than galvanized steel, making it an ideal choice for construction materials that are exposed to the elements, such as roofing, cladding, and framing.

2. High Temperature Resistance

• Thermal Stability: 55% Aluzinc steel has a high melting point (about 660°C), which makes it suitable for applications in environments that experience high temperatures. This feature is especially beneficial for the Australian market, which has a mix of tropical and arid climates with high summer temperatures.

3. Excellent Heat Reflectivity

• Energy Efficiency: The aluminum-zinc coating has superior reflectivity, often twice the reflectivity of galvanized steel. This makes it ideal for use in regions with intense sunlight, like Australia, where reducing heat absorption in buildings can help improve energy efficiency by lowering cooling costs.

4. Lightweight and Strong

• Structural Strength: Despite its lightweight nature, 55% Aluzinc steel provides high strength and can withstand significant mechanical stress. This is crucial in light steel frame constructions, where strength-to-weight ratio is essential for load-bearing capacity while maintaining ease of handling and transportation.

5. Aesthetic Appeal

• Modern Look: 55% Aluzinc steel has a smooth, glossy finish that enhances the aesthetic appeal of buildings. It is often used in architectural designs for both residential and commercial buildings, offering a clean, modern look.

6. Resistance to Harsh Weather Conditions

• Weatherproof: The Australian climate is characterized by extreme weather conditions, including intense heat, storms, and humidity. 55% Aluzinc steel provides resilience against UV radiation, saltwater corrosion (especially near coastal areas), and the severe weather that can affect steel structures.