Galvalume Steel Coil

Packing Details: waterproof paper+plastic film+iron packing+bundling, or as per customers request.

Q1: What is the primary advantage of Galvalume coil compared to standard Galvanized steel coil?

A: The key advantage is significantly superior corrosion resistance. The 55% Aluminum-Zinc coating provides a unique combination of barrier and galvanic protection. In most environments, Galvalume offers 2 to 4 times the service life of an equivalent coating mass of galvanized steel. This translates to lower long-term costs and reduced maintenance for your projects and products.

Q2: How does the cost of Galvalume compare to Galvanized steel?

A: Initially, Galvalume carries a moderate premium over standard galvanized steel due to its advanced coating technology and performance benefits. However, it is crucial to consider the Total Cost of Ownership (TCO). Given its exceptional longevity and durability, Galvalume often proves to be the more cost-effective solution over the lifespan of an application, reducing the need for early replacement or repair.

Q3: What are the standard coating designations (e.g., AZ100, AZ150), and how do I choose the right one?

A: Coating designations like AZ100, AZ150, and AZ180 refer to the total coating mass in grams per square meter (g/m²) on both sides.

AZ100: ~100 g/m² total. Suitable for interior or mild environments.

AZ150: ~150 g/m² total. A versatile, standard choice for most roofing and wall applications.

AZ180: ~180 g/m² total. Recommended for highly corrosive environments (e.g., coastal, industrial areas).
We can guide you on the optimal coating weight based on your specific application and environmental exposure.

Q4: Can Galvalume steel be formed or welded easily?

A:

Formability: Yes, it has excellent formability. The coating is designed to be ductile and can withstand severe bending and roll-forming without flaking or peeling, making it ideal for profiled roofing and cladding.

Weldability: Galvalume can be welded, but it requires different parameters than plain steel. We recommend Resistance Spot Welding and can provide detailed technical guidelines for our specific grades to ensure strong, consistent weld quality.

Q5: We notice small "crazing" or micro-cracks on the surface. Is this a defect?

A: No, this is a normal characteristic and not a defect. The "crazing" pattern is a result of the aluminum in the coating, which has a different thermal expansion coefficient than steel. It becomes visible after cooling and is a natural feature of the Aluzinc coating. It does not affect the corrosion protection or structural performance of the product.

Q6: What is the cut-edge protection like? Is the edge vulnerable to rust?

A: This is an excellent question. The Galvalume coating provides sacrificial (cathodic) protection to the cut edges, similar to galvanized steel. The zinc in the coating will sacrificially protect the exposed steel at the cut edge, preventing red rust from spreading. For maximum longevity in highly aggressive environments, we recommend sealing cut edges with a appropriate touch-up paint.

Q7: What surface treatments or paint systems are compatible with Galvalume coil?

A: Galvalume is an outstanding substrate for painting. Its smooth surface and inherent corrosion resistance lead to excellent paint adhesion and long-term paint performance. We can supply pre-painted Galvalume coils in a wide range of colors and finishes (e.g., PVDF, Polyester) to meet your aesthetic and durability requirements.

Q8: What are your standard lead times, and what is your packaging standard?

A: Our standard lead time is [e.g., 2-4 weeks] after order confirmation, subject to project size and specifications. We understand the importance of supply chain reliability. All our coils are packaged to prevent damage during transit and storage, typically featuring waterproof paper, inner and outer steel sleeves, and wooden pallets to ensure the material arrives in pristine condition.

Q9: Can you provide custom sizes or specific mechanical properties?

A: Absolutely. We specialize in serving B2B clients with tailored solutions. We can supply custom width, thickness, and coil weight. Furthermore, we can provide coils with specific yield strength and tensile strength (e.g., Structural Grades S320GD-S550GD) to meet the demands of your specific application. Please consult with our technical sales team for your requirements.

Q10: WHY SHOULD I CHOOSE YOU?