Introduction to Aluzinc Coated Steel – Properties and Benefits

​1. Definition

Aluzinc Steel Strips, also known as ​hot-dip aluminum-zinc coated steel strips, are high-performance steel products coated with an alloy layer composed of ​55% aluminum, 43.4% zinc, and 1.6% silicon. This unique composition combines the superior corrosion resistance of aluminum with the sacrificial protection of zinc, making it an advanced alternative to traditional galvanized steel. Widely used in industries requiring durability, heat resistance, and aesthetic appeal, Aluzinc-coated steel is a cornerstone material for modern engineering challenges.

​2. Manufacturing Process

The production of Aluzinc Steel Strips involves several critical steps:

1. ​Surface Preparation:
   • Steel strips undergo ​acid pickling to remove oxides, oils, and impurities, ensuring optimal coating adhesion.
2. ​Annealing:
   • The strips are heated in a ​continuous annealing furnace (680–720°C) to enhance ductility and prepare the surface for coating.
3. ​Hot-Dip Coating:
   • The strips are immersed in a molten aluminum-zinc alloy bath at ​630–660°C for 3–5 seconds. The silicon content prevents excessive alloying between the coating and steel substrate, ensuring a uniform layer.
4. ​Cooling and Finishing:
   • Rapid cooling via air knives or water quenching solidifies the coating. Post-treatments like ​chromating, ​oiling, or ​anti-fingerprint coatings are applied to enhance corrosion resistance and surface quality.

Advanced variants, such as ​high-pressure cold-sprayed Aluzinc coatings, achieve denser microstructures (porosity as low as 0.32%) for superior corrosion protection in marine environments.

​3. Core Characteristics

1. ​Exceptional Corrosion Resistance:
   • The aluminum-rich coating forms a dense ​Al₂O₃ oxide layer, offering ​2–6 times longer lifespan than conventional galvanized steel, even in harsh environments like coastal areas.
2. ​Heat Resistance:
   • Withstands temperatures up to ​315°C without discoloration or oxidation, ideal for automotive exhaust systems and industrial ovens.
3. ​Aesthetic and Functional Versatility:
   • Features a ​silver-spangled finish suitable for architectural applications. Optional coatings like ​high-durability polyester (HDP) enhance UV resistance and color retention.
4. ​Lightweight and Cost-Efficiency:
   • High strength-to-weight ratio reduces material consumption, while minimal lifecycle maintenance costs make it economically viable.

​4. Application Scenarios

​5. Summary

Aluzinc Steel Strips represent a technological leap in coated steel products, merging ​aluminum’s barrier protection with ​zinc’s cathodic protection to deliver unmatched performance. Its standardized production process ensures consistent quality, while its versatility spans industries from construction to renewable energy. Key advantages include:

• ​Extended Service Life: 2–6 times longer than traditional galvanized steel.
• ​Sustainability: Recyclable and compatible with energy-efficient production methods (e.g., closed-loop water systems, scrap recycling).
• ​Adaptability: Variants with ​pre-painted HDP coatings (15–18 years outdoor durability) or ​strippable films cater to extreme weather conditions and installation requirements.

As global industries prioritize sustainability and performance, Aluzinc Steel Strips are poised to remain a critical innovation in material science, driving advancements in infrastructure, transportation, and green energy solutions.

For specialized applications, manufacturers like ​CGoodSteel (ISO-certified) offer tailored solutions with advanced testing and technical support, ensuring compliance with international standards.