Galvalume coated steel is steel coated with an aluminum-zinc alloy containing approximately 55% aluminum, 43.4% zinc, and 1.6% silicon. It offers excellent corrosion resistance, durability, and heat resistance, making it suitable for roofing, wall cladding, construction, and industrial applications. Wanzhi Group supplies galvalume steel coils, sheets, roofing sheets, and profiles in various specifications with coating weights of AZ30–AZ150 g/m².
- Thickness: 0.12 mm – 4.0 mm
- Width: 600 mm – 1,500 mm
- Standard: EN, ASTM, JIS, GB
- Steel Grades: DX51D, DX52D, DX53D, S220GD, S250GD, S280GD, S320GD, S350GD, etc.
What Is Galvalume Coated Steel?
Galvalume steel is produced by continuously hot-dip coating a steel substrate with an aluminum-zinc alloy. The coating typically contains approximately 55% aluminum, 43.4% zinc, and 1.6% silicon. The resulting coating provides excellent corrosion and heat resistance. Aluminum forms a protective barrier, while zinc provides sacrificial protection to the steel substrate. Silicon helps control the coating–steel interface and the formation of the coating during the hot-dip process.
- Common grades include DX51D, DX52D, DX53D, S220GD, S250GD, S280GD, S320GD, and S350GD, depending on forming and structural requirements.
- Common international standards include ASTM A792/A792M, EN 10346, and JIS G3321.
Galvalume Steel Substrate Chemical Composition
The chemical composition above is based on the steel substrate requirements of EN 10346:2015 for continuously hot-dip coated steel flat products. The listed values are maximum limits by mass. DX51D, DX52D, and DX53D are cold-forming steel grades, while S220GD to S350GD are structural steel grades. The “+AZ” designation indicates an aluminum-zinc coating, while the steel grade defines the properties of the substrate.
| Steel Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Ti (%) |
| DX51D+AZ | ≤0.18 | ≤0.50 | ≤1.20 | ≤0.12 | ≤0.045 | ≤0.30 |
| DX52D+AZ | ≤0.12 | ≤0.50 | ≤0.60 | ≤0.10 | ≤0.045 | ≤0.30 |
| DX53D+AZ | ≤0.12 | ≤0.50 | ≤0.60 | ≤0.10 | ≤0.045 | ≤0.30 |
| S220GD+AZ | ≤0.20 | ≤0.60 | ≤1.70 | ≤0.10 | ≤0.045 | — |
| S250GD+AZ | ≤0.20 | ≤0.60 | ≤1.70 | ≤0.10 | ≤0.045 | — |
| S280GD+AZ | ≤0.20 | ≤0.60 | ≤1.70 | ≤0.10 | ≤0.045 | — |
| S320GD+AZ | ≤0.20 | ≤0.60 | ≤1.70 | ≤0.10 | ≤0.045 | — |
| S350GD+AZ | ≤0.20 | ≤0.60 | ≤1.70 | ≤0.10 | ≤0.045 | — |
Specifications
| Product Name | Galvalume Coated Steel (GL) |
|---|---|
| Coating Type | Aluminum-zinc alloy coating (Al-Zn-Si) |
| Coating Composition | Approx. 55% Al, 43.4% Zn, 1.6% Si |
| Steel Grades | DX51D, DX52D, DX53D, S220GD, S250GD, S280GD, S320GD, S350GD, etc. |
| Al-Zn Coating Weight | AZ30 - AZ150 g/m² |
| Thickness | 0.12 mm – 4.0 mm |
| Width | 600 mm – 1,500 mm |
| Product Forms | Coils, sheets, strips, corrugated sheets, profiles |
| Processing Services | Slitting, cutting, profiling, punching, bending, etc. |
| Surface Treatment | Chromated, passivated, oiled, anti-fingerprint, etc. |
| Standard | EN, ASTM, JIS, GB |
| MOQ | 10 tons |
| Quality Certificates | ISO, SGS, BV, CE, etc. |
| Delivery Time | 5–45 working days |
| Package | Standard export packing, or as per your requirements |
Galvalume Coated Steel vs Galvanized Steel
Galvalume steel offers strong corrosion and heat resistance through its aluminum-zinc alloy coating. Galvanized steel provides reliable sacrificial protection through its zinc coating. Galvalume is often preferred for roofing and cladding, while galvanized steel remains widely used in construction and industrial applications.
| Item | Galvalume Steel | Galvanized Steel |
| Coating | Aluminum-zinc alloy (Al-Zn-Si) | Mainly Zinc (Zn) |
| Corrosion Resistance | Excellent barrier and sacrificial protection | Excellent sacrificial protection |
| Heat Resistance | Higher | Lower |
| Weldability | Good | Good |
| Service Life | Generally longer | Long-lasting |
Galvalume Coated Steel for Sale
Wanzhi Group produces and supplies galvalume coated steel, including galvalume steel coils, sheets, strips, corrugated sheets, and profiles. We implement strict quality control from raw material inspection and production monitoring to finished product testing, with dedicated personnel overseeing each stage. Our factory has a quality inspection laboratory and sample room for product testing and sample analysis. Each shipment includes an MTC and comprehensive test report, with SGS or BV third-party inspection available upon request.
Galvalume Coated Steel Manufacturing Process
- Steel Coil Preparation: Uncoil and inspect the steel substrate before coating.
- Cleaning and Annealing: Remove surface contaminants and anneal the strip to achieve the required mechanical properties.
- Hot-Dip Al-Zn Coating: Pass the prepared steel strip through a molten aluminum-zinc alloy bath to form the Galvalume coating.
- Coating Control: Adjust the coating thickness using an air-knife system to achieve the specified AZ coating mass.
- Cooling and Surface Treatment: Cool the coated strip and apply passivation, oiling, or other required surface treatments.
- Inspection and Quality Control: Check coating mass, thickness, surface quality, mechanical properties, and other requirements.
- Recoiling and Packaging: Recoil the finished strip and package it for storage or shipment.
Properties and Advantages of Aluzinc Coated Steel
- Excellent Corrosion Resistance: Aluminum provides barrier protection, while zinc provides sacrificial protection.
- Good Heat Resistance: The Al-Zn coating performs well at elevated temperatures.
- High Solar Reflectivity: The metallic coating reflects solar radiation, helping reduce heat absorption in roofing applications.
- Good Formability: Suitable for bending, profiling, and other forming processes, depending on the steel grade.
- Long Service Life: Provides durable corrosion protection in suitable environments.
- Metallic Appearance: Offers a uniform silver-gray surface suitable for roofing and cladding.
GL Coated Steel Applications
- Roofing: Residential, commercial, and industrial roofing sheets requiring corrosion and heat resistance.
- Wall Cladding: Exterior wall panels and building cladding.
- Construction: Structural components, panels, and building materials.
- Agricultural Buildings: Barns, sheds, and other agricultural structures.
- Industrial Facilities: Factory buildings, warehouses, and equipment enclosures.
- HVAC Systems: Ducts and components requiring corrosion-resistant sheet steel.
- Automotive Components: Selected vehicle parts and components requiring corrosion and heat resistance.
Galvalume Coated Steel Prices
Galvalume coated steel prices typically range from USD 600–900 per ton, depending on steel base prices, AZ coating mass, thickness, width, steel grade, and order quantity. Contact Wanzhi Group for an accurate quotation based on your specific requirements and order quantity.
How to Choose the Right Galvalume Coated Steel?
- Choose the Right Steel Grade: Select forming or structural grades based on strength and processing requirements.
- Choose the Appropriate AZ Coating: Select the coating mass based on the application and corrosion exposure.
- Consider the Environment: Avoid strong alkaline or acidic conditions, uncured concrete, and direct contact with incompatible metals such as copper and lead.
- Select the Right Dimensions: Choose the thickness, width, and product form according to the application and processing requirements.
- Consider Surface Treatment: Select passivation, oiling, or other treatments based on storage and application conditions.
- Plan Cutting and Processing: Prefer factory processing where possible. For on-site cutting, use suitable shears or snips and avoid abrasive cutting methods that may damage the coating.
- Check Quality Documentation: Confirm the applicable standard, MTC, coating mass, steel grade, and inspection requirements before purchase.
Galvalume Coated Steel Manufacturer and Supplier – Wanzhi Group
Wanzhi Group is a galvalume coated steel manufacturer and supplier in China. Our factory, Shandong Wanzhi Steel Co., Ltd., is located in Boxing County, Binzhou, Shandong Province. We operate galvalume steel production lines, along with precision slitting, leveling, laminating, and coating equipment. With an annual capacity of 600,000 tons, we provide stable supply and consistent quality. As a direct factory supplier, we offer competitive prices and customized galvalume steel products in various shapes, sizes, and specifications.
Aluzinc Steel Production Lines
Wanzhi operates aluzinc steel, galvanized steel, prepainted galvalume steel, and zinc-aluminum-magnesium steel production lines, with each line having a monthly capacity of up to 10,000 tons. We supply aluzinc steel raw materials and finished products to customers in 120+ countries and regions. Furthermore, we provide value-added processing services, including coating, slitting, bending, cutting, forming, and stamping.
Packaging and Shipping
Wanzhi uses standard export packaging, including plastic film, moisture-proof paper, galvanized steel sheets, corner protectors, and wooden pallets. Customized packaging is also available upon request. We support FOB, CIF, EXW, and other trade terms, and assist with customs declaration, commodity inspection, and booking to facilitate timely delivery.
Global Cases and Projects
Wanzhi Group offers competitive prices, a wide product range, and one-stop services. We provide customized solutions for customers in the construction, industrial, home appliance, and transportation sectors worldwide. We accept both small trial orders and large-volume purchases, offering competitive factory prices and sufficient production capacity to meet the steel requirements of various projects.
Wanzhi Steel – Agricultural Greenhouse Project in Turkmenistan
550 tons PPGI Steel Coil to Azerbaijan
100 tons of Galvanized Coils to Saudi Arabia
144 ton Steel Wire to Spanish
Project of PPGI Roofing en Libya
100 tons of GL and PPGL in Solomon Islands
Wanzhi Group supplies galvalume coated steel in thicknesses from 0.12 to 4 mm, offering excellent corrosion resistance and solar reflectivity. It is suitable for use in high-temperature, humid, or corrosive environments. For more information about galvalume steel (GL) or prepainted galvalume steel (PPGL), please leave us a message.