Development history of Aluzinc steel coil
Alu-zinc coating technology (trade name Galvalume) was developed by Bethlehem Steel Company in the United States in 1972. The original intention was to solve the shortcomings of galvanized steel in high-temperature and corrosive environments. In the 1980s, after its patent was opened, Japan and Europe quickly introduced and optimized the production process. For example, Japan's JFE Steel developed a more weather-resistant "SuperDyma" coating (containing magnesium). After 2000, China became the world's largest producer of aluzinc steel coils. The technological iteration has promoted its application areas from traditional construction to high-end fields such as new energy and automobiles.
Core parameters
- Composition and coating: aluminum (55%), zinc (43.4%), silicon (1.6%), silicon can inhibit alloy embrittlement; coating weight coverage 30-210/m² (light load to heavy corrosion environment);
- Base material performance: thickness 0.13-1.6mm (ultra-thin for home appliances, thick plates for structural parts), tensile strength 270-550MPa, can be processed into color-coated substrate or used directly;
- Corrosion resistance: salt spray test for more than 1000 hours (3 times that of galvanized sheet), high-temperature oxidation resistance up to 315℃ without failure, thermal reflectivity over 75% (reduce building energy consumption).
Application Scenario
- Green buildings: metal roofs (weather resistance), solar brackets (lightweight), prefabricated steel structures (corrosion resistance);
- New energy fields: photovoltaic frames (UV resistance), new energy vehicle battery shells (heat dissipation and protection);
- High-end manufacturing: home appliance panels (spray-free), food-grade storage tanks (no heavy metal precipitation), coastal containers (salt spray resistance);
- Agricultural innovation: smart greenhouses (acid and alkali mist resistance), livestock farm fences (ammonia corrosion resistance).
Technical advantages
- Triple protection mechanism: aluminum oxide layer isolates corrosive media, zinc sacrificial anode protects incision, and silicon enhances coating adhesion;
- Outstanding economic performance: lifespan reaches 30 years (10-15 years for galvanized sheet), and full-cycle cost is reduced by 40%;
- Environmentally friendly and compatible: 100% recyclable, production energy consumption is 65% lower than stainless steel, and it meets carbon neutrality requirements.
Type and differentiation
- Conventional aluminum zinc sheet (type C): coating 30-60g/m², used in dry inland environment (such as factory roof);
- Enhanced type (type H): coating 60-180g/m², containing magnesium/titanium elements, specializing in marine climate (such as cross-sea bridge guardrail);
- Functional coating:
High reflective type: surface microporous treatment, reflectivity increased to 85% (cooling and energy saving);
Conductive type: copper is added to the coating, used for 5G base station anti-electromagnetic shielding;
Pre-lubricated type: the coating contains an organic film, which is directly stamped and formed (reducing the production process of home appliances).
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