1.0mm 55% Al-Zn Galvalume Steel Coil, AZ40 to AZ200 Coating Weight Anti-Corrosion Steel

 

Galvalume steel coil stands out as a high-performance coated steel material formulated with a scientific alloy composition of 55% aluminum, 43.5% zinc, and 1.5% silicon. Different from conventional single zinc-coated steel, this specialized alloy structure integrates the physical barrier protection of aluminum and the self-repairing electrochemical protection of zinc, delivering outstanding anti-rust and anti-corrosion capabilities for long-term outdoor and industrial service.

Manufactured strictly in accordance with ASTM A792, EN 10346 and JIS G3321 international standards, our galvalume steel coil covers a thickness range of 0.12mm to 1.0mm and multiple coating grades from AZ40 to AZ200. Verified by professional third-party tests, its atmospheric corrosion resistance is 2 to 4 times superior to ordinary hot-dip galvanized steel. With stable mechanical properties and excellent surface flatness, it serves as a reliable base material for architectural construction, household appliance manufacturing, industrial equipment and agricultural facilities.

 

Different coating weights and surface treatments correspond to different corrosion resistance levels. We provide targeted selection suggestions for mainstream application scenarios to help customers avoid over-investment or insufficient performance:
1. Building Roof & Wall Engineering
Recommended coating: AZ120-AZ150 passivated galvalume coil. It is widely used in factory buildings, logistics warehouses and public building roof and wall substrates. It features heat insulation, weather resistance and long service life. For coastal areas with high salt spray corrosion, AZ150 and above high-grade coating is strongly recommended to resist marine climate erosion.
2. Household Appliance Manufacturing
Recommended coating: AZ80-AZ100 anti-fingerprint galvalume coil. The smooth and stain-resistant surface is suitable for refrigerator back panels, air conditioner shells and washing machine structural parts. It meets indoor environmental protection standards and has good stamping and molding performance.
3. Agricultural & Aquacultural Facilities
Recommended coating: AZ80-AZ120 conventional passivated coil. It is applied to greenhouse skeletons, breeding sheds and grain storage equipment, which can effectively resist corrosion caused by fertilizers, pesticides and humid environment, reducing frequent maintenance costs.

4. Industrial Equipment & Automotive Accessories
Recommended coating: AZ100-AZ120 phosphated galvalume coil. The treated surface has excellent paint adhesion, suitable for mechanical equipment shells, ventilation ducts and automotive lightweight structural parts, matching industrial painting and assembly processes.
5. Packaging & Indoor Structural Materials
Recommended coating: AZ40-AZ80 economical coating. It is applicable to dry indoor environments such as equipment packaging and internal support structures, achieving a balance between cost and basic anti-corrosion performance.

Every batch of our galvalume steel coil undergoes standardized and refined production procedures to stabilize coating uniformity, surface finish and mechanical indicators, eliminating defective products from the source:

Substrate pretreatment: The cold-rolled steel substrate is processed through alkali degreasing, acid pickling and deionized water rinsing to completely remove surface oil stains, rust layers and impurities, ensuring tight bonding between the alloy coating and the substrate.

Constant-temperature hot-dip plating: The cleaned steel strip enters a 550°C constant-temperature alloy liquid tank. The precise proportion of aluminum, zinc and silicon ensures uniform coating formation on both sides of the steel strip, avoiding local thin coating or missing coating.

Precision air knife calibration: Professional air knife equipment accurately controls the coating thickness, with a thickness error controlled within ±5g/㎡, far higher than the industry conventional standard, ensuring consistent coating weight of each steel coil.

Graded cooling molding: The segmented gradual cooling process optimizes the internal grain structure of the coating, effectively preventing coating brittleness and cracking, and improving the overall formability and durability of the steel coil.

Customized surface treatment: According to customer application demands, we provide optional chromate passivation, phosphate treatment and anti-fingerprint treatment to enhance surface stain resistance, paint adhesion and environmental adaptability.

Full inspection before delivery: Before leaving the factory, all products will pass coating thickness detection, dimensional calibration, surface defect inspection and adhesion test. Only products that fully meet international standards can be packaged and delivered.

 

To ensure products remain intact during long-distance transportation, we adopt professional export packaging solutions. For standard packaging, steel coils are tightly wrapped with waterproof and moisture-proof paper and secured with steel strips to prevent loosening and deformation in transit. All steel coils are fastened onto sturdy wooden pallets, effectively avoiding damage caused by collision, scratches and dampness during transportation.

We mainly ship goods from Qingdao Port and Tianjin Port in China. As vital international trade hubs, these two ports boast a sound maritime transportation network, enabling us to provide efficient and cost-effective logistics solutions for clients worldwide. For small-batch orders, we can finish production and arrange delivery within 7 to 15 days after receiving the deposit, and the specific lead time can be flexibly adjusted according to order volume and project schedule.

The standard minimum order quantity is 5 tons. We accept smaller trial orders for new customers, allowing them to inspect product quality before placing bulk purchases. With an annual production capacity of 200,000 tons, we can steadily supply various large-scale engineering projects and guarantee that construction progress will not be delayed by material shortages.

Our aluminum-zinc coated steel coils have obtained a series of internationally authoritative certifications, including ISO 9001 Quality Management System Certification, CE EU Safety Certification, as well as test reports issued by third-party institutions such as SGS and BV. The products fully comply with RoHS and REACH environmental standards and can meet market access requirements of countries across the globe. We are able to provide all relevant certification documents to help customers smoothly pass local project acceptance.

In addition to high-quality products, we also offer comprehensive full-process service support for customers worldwide. Equipped with a professional technical team, we provide customers with all-round technical consultation ranging from material selection to solution design. We support customized production according to customers' drawings or samples, and can adjust various parameters including product size, color and coating type to satisfy personalized demands of clients.

We have established a sound after-sales service system, providing services such as online technical support, on-site installation guidance and staff training. We promise to respond rapidly and solve problems timely in case of product quality issues to ensure the smooth progress of customers' projects. Meanwhile, we offer flexible payment terms and support multiple settlement methods including T/T and sight L/C to ease customers' capital pressure.

Q1: What is the difference between galvalume steel coil and galvanized steel coil?

The core difference lies in the coating composition and anti-corrosion mechanism. Galvanized steel adopts pure zinc coating with single electrochemical protection, while galvalume steel uses aluminum-zinc-silicon alloy composite coating with dual physical barrier and self-repair protection. Galvalume steel has better heat resistance, molding performance and longer service life, which is more suitable for harsh outdoor and industrial environments.

Q2: Is galvalume coil suitable as a substrate for color coated steel?

Yes, it is the preferred high-quality substrate for color coated steel. Compared with galvanized substrate, galvalume substrate has more stable surface performance and stronger paint adhesion, which can increase the service life of color coated products by 30%-50%. It is recommended to choose AZ100-AZ120 coating for color coating processing.

Q3: How to store galvalume steel coils to avoid oxidation?

It is recommended to store in a dry and ventilated indoor warehouse, place on wooden pallets to avoid direct contact with the ground, and keep away from corrosive gas and humid environment. Outdoor temporary storage must be covered with waterproof tarpaulins. Under standard storage conditions, the product can maintain intact surface performance within 6 months.

Q4: Can you provide customized processing services?

We support one-stop customized services such as fixed-length cutting, precise slitting, edge trimming and surface special treatment. The minimum slitting width can reach 30mm, and all processed products are deburred to ensure safe and convenient customer use.

Q5: How to choose the most suitable coating weight for my project?

Dry indoor scenarios choose AZ40-AZ80; mild rural and suburban environments choose AZ70-AZ100; industrial zones and mild coastal areas choose AZ100-AZ120; severe coastal salt spray and chemical plant environments choose AZ150-AZ200. Our technical team can provide free targeted selection suggestions according to your project location and usage environment.