Galvalume Steel Sheet (GL Sheet)
Galvalume steel sheet (GL sheet) with 55% Aluminum-Zinc alloy coating for superior corrosion resistance (2-4x longer life than galvanized). Thickness 0.12-3.0mm, width 600-1500mm, coating AZ50-AZ200. Grades DX51D+AZ, SGLCC. ASTM A792. Mill test certificate provided.
| Material | Carbon Steel with 55% Aluminum-Zinc Alloy Coating |
|---|---|
| Grade / Standard | DX51D+AZ / SGLCC / S280GD+AZ |
| Thickness | 0.12mm - 3.0mm |
| Width | 600mm - 1500mm |
| Inner Diameter (ID) | 508mm / 610mm |
| Coil Weight | 3-8 Tons |
| Delivery Condition | cold_rolled / annealed |
| Surface Treatment | coated |
| MOQ | 5 Tons |
| Delivery Time | 10-25 Days / In Stock |
| Loading Port | Tianjin / Shanghai / Qingdao |
Overview of Galvalume Steel Sheet (GL Sheet)
Galvalume steel sheet, also known as Aluzinc steel sheet (GL sheet), is a carbon steel sheet hot-dip coated with a unique 55% aluminum-zinc alloy. This advanced coating, consisting of approximately 55% aluminum, 43.4% zinc, and 1.6% silicon, provides superior long-term corrosion resistance compared to traditional galvanized steel, especially in severe atmospheric and marine environments. Specified under standards such as ASTM A792 / EN 10346 / JIS G3321, Galvalume steel combines the barrier protection of aluminum with the sacrificial protection of zinc, creating a highly durable and cost-effective material.
The sheet is manufactured on a continuous hot-dip coating line where a cold rolled steel coil is cleaned, annealed, and immersed in a molten bath of the Al-Zn alloy. The resulting coating offers 2 to 4 times the service life of galvanized steel with an equivalent coating thickness. The Al-Zn alloy coating weight is designated by ‘AZ’, with common specifications including AZ100 (100 g/m²), AZ150 (150 g/m²), and AZ185 (185 g/m²). Galvalume steel sheet is the material of choice for high-performance metal roofing, architectural wall cladding, agricultural buildings, automotive components, and as the premium substrate for Prepainted Galvalume (PPGL) steel.
Key Features and Coating Performance
Galvalume steel sheet offers exceptional corrosion resistance through a combination of barrier and sacrificial protection. The high aluminum content in the coating forms a durable, inert aluminum oxide barrier layer that isolates the steel from the environment. The zinc component provides sacrificial cathodic protection at cut edges, scratches, and perforations, preventing the spread of rust. This dual mechanism results in a service life that can exceed 50 years in many applications, particularly for AZ150 coatings.
The sheet is supplied in a thickness range from 0.12mm to 3.0mm with widths from 600mm to 1500mm, available in coil form or as cut-to-length sheets. Substrate grades include DX51D+AZ (general forming), DX52D+AZ (deep drawing), up to DX54D+AZ (extra deep drawing), and high-strength structural grades like S280GD+AZ and S350GD+AZ. Galvalume steel has a characteristic small, silvery, and aesthetically pleasing spangle. Common surface treatments include clear Anti-Fingerprint (AFP) coating (also known as acrylic coating or passivation), which prevents staining during handling and improves roll-forming performance, and oiling.
Main Applications of Galvalume Steel Sheet
Due to its superior corrosion resistance and attractive silvery finish, Galvalume steel sheet is the preferred material for architectural and residential metal roofing systems, including standing seam roofs, corrugated panels, and roof tiles. It is extensively used for wall cladding, building facades, industrial siding, and pre-engineered metal buildings where long-term durability and low maintenance are critical.
The agricultural sector uses GL sheet for grain silos, barns, and livestock confinements. In the automotive industry, its excellent heat resistance (up to 315°C) makes it ideal for mufflers, exhaust pipes, and heat shields. Appliance manufacturers use Galvalume for components in air conditioners, ovens, and water heaters. Most importantly, Galvalume steel sheet is the primary substrate for producing Prepainted Galvalume (PPGL) sheets and coils, which are used in a vast array of colored architectural and decorative applications requiring the highest level of performance and longevity.
Why Choose Us for Galvalume Steel Sheet
Shandong Tanglu Metal Material Co., Ltd. supplies premium Galvalume steel sheet (Aluzinc) from leading Chinese mills with internationally recognized production lines certified to ISO 9001 and ISO 14001 standards. Every coil of GL sheet is subject to stringent quality control, including chemical composition analysis of the base metal, mechanical property testing (tensile, yield, elongation), and Al-Zn coating weight verification according to ASTM A792 / EN 10346. We also perform salt spray corrosion testing (ASTM B117) to confirm the coating’s superior performance.
We provide a full range of specifications, including thickness from 0.12mm to 3.0mm, width 600-1500mm, and Al-Zn coating weights from AZ50 to AZ200. We stock various substrate grades (DX51D+AZ to S350GD+AZ) with surface treatments like Anti-Fingerprint (AFP) coating. With extensive experience exporting to roofing manufacturers, PPGL producers, and construction contractors in over 80 countries, we can fulfill both project-based and bulk container orders efficiently. Each shipment is accompanied by an original mill test certificate (MTC) to EN 10204 3.1, with options for EN 10204 3.2 and third-party inspections (SGS, BV) to meet your project’s quality assurance requirements.
📐 Dimension & Size Table
| Thickness (mm) | Width (mm) | Al-Zn Coating (g/m²) | Coil Weight (T) |
|---|---|---|---|
| 0.14 | 600-1250 | AZ50-AZ100 | 3-5 |
| 0.18 | 600-1250 | AZ50-AZ100 | 3-5 |
| 0.25 | 600-1250 | AZ70-AZ150 | 3-8 |
| 0.30 | 600-1500 | AZ70-AZ150 | 3-8 |
| 0.40 | 700-1500 | AZ100-AZ150 | 3-8 |
| 0.47 | 700-1500 | AZ100-AZ150 | 5-8 |
| 0.50 | 700-1500 | AZ100-AZ150 | 5-8 |
| 0.60 | 700-1500 | AZ100-AZ185 | 5-8 |
| 0.80 | 700-1500 | AZ100-AZ185 | 5-8 |
| 1.00 | 700-1500 | AZ100-AZ200 | 5-8 |
| 1.20 | 700-1500 | AZ100-AZ200 | 5-8 |
| 1.50 | 800-1500 | AZ120-AZ200 | 5-8 |
| 2.00 | 1000-1500 | AZ150-AZ200 | 5-8 |
| 3.00 | 1000-1500 | AZ150-AZ200 | 5-8 |
* Custom sizes available upon request. Tolerances per relevant international standards.
🔬 Chemical Composition
| Element | Min | Max | Display Value | Note |
|---|---|---|---|---|
| C | - | 0.12 | ≤0.12 | Base metal, DX51D+AZ per EN 10346 |
| Si | - | 0.50 | ≤0.50 | Base metal |
| Mn | - | 0.60 | ≤0.60 | Base metal |
| P | - | 0.10 | ≤0.10 | Base metal |
| S | - | 0.045 | ≤0.045 | Base metal |
| Al (Coating) | 55.0 | - | ≈55.0% | Hot-dip coating composition |
| Zn (Coating) | 43.4 | - | ≈43.4% | Hot-dip coating composition |
| Si (Coating) | 1.6 | - | ≈1.6% | Coating additive for adhesion |
* Chemical composition may vary by heat, thickness and specification. Please refer to the actual mill test certificate.
⚙️ Mechanical Properties
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (DX51D+AZ) | 270-500 | MPa | Per EN 10346, general forming |
| Yield Strength (DX51D+AZ) | ≤500 | MPa | Maximum value |
| Elongation A80 (DX51D+AZ) | ≥22 | % | Gauge length 80mm |
| Yield Strength (S280GD+AZ) | ≥280 | MPa | Structural high strength grade |
| Tensile Strength (S280GD+AZ) | ≥360 | MPa | Structural grade |
| Elongation A80 (S280GD+AZ) | ≥19 | % | Structural grade |
| Coating Adhesion | Pass | - | 180° bend test, no flaking or cracking |
| Salt Spray Test | ≥1000 | hours | AZ150 coating, ASTM B117 to 5% red rust |
* Values shown are minimum requirements unless otherwise stated.
📦 Commercial Information
| Packaging | Standard seaworthy export packing for Galvalume steel sheets. Sheets are stacked on wooden pallets (typically 3-5 tons per stack), wrapped in waterproof paper and PE film, with cardboard or wooden edge protectors, and secured with steel strapping. Each package is clearly tagged with heat number, grade designation (e.g., DX51D+AZ), thickness, width, Al-Zn coating weight (e.g., AZ150), surface treatment (e.g., AFP), and weight. Custom packaging is available for premium architectural applications. |
|---|---|
| Payment Terms | T/T (Telegraphic Transfer),L/C (Letter of Credit),D/P (Documents against Payment),Western Union,PayPal |
| Price Term | FOB,CFR,CIF,EXW |
| Supply Capacity | 25,000 Tons/Month (Galvalume Products) |
| Loading Port | Tianjin / Shanghai / Qingdao |
Why Choose Our Galvalume Steel Sheet (GL Sheet)?
Superior Corrosion Resistance
55% Al-Zn alloy coating provides 2 to 4 times the service life of traditional galvanized steel. AZ150 coating withstands over 1000 hours in salt spray tests (ASTM B117) and offers a 50+ year design life in most environments.
Full Specification Range
Thickness 0.12-3.0mm, width 600-1500mm, with Al-Zn coating from AZ50 to AZ200 g/m². Substrate grades from commercial (DX51D+AZ) to structural (S350GD+AZ) are available to meet diverse application needs.
Aesthetic Finish & Heat Resistance
Features an attractive, uniform silvery spangle that can be used as an unpainted finish. The coating also offers excellent heat resistance and reflectivity, maintaining its integrity at temperatures up to 315°C (600°F).
Advanced Surface Treatments
Available with a clear Anti-Fingerprint (AFP) coating that prevents staining, enhances lubricity for roll-forming, and provides a primer-like surface for painting. Chromated and oiled options are also available.
Certified Quality & Traceability
Supplied with an original Mill Test Certificate (MTC) per EN 10204 3.1, verifying all chemical and mechanical properties, including the precise Al-Zn coating weight. Full traceability from raw material to final product.
🏭 Applications of Galvalume Steel Sheet (GL Sheet)
Galvalume steel sheet (GL sheet) is a premier material for applications demanding long-term corrosion resistance and durability. It is the top choice for architectural and residential metal roofing, including standing seam, corrugated, and tile profiles, as well as for wall cladding and siding on commercial and industrial buildings. Its natural silvery finish is often used without painting for a clean, modern aesthetic. The agricultural industry relies on GL sheet for long-lasting grain bins, silos, and animal confinement buildings. Thanks to its excellent heat resistance, it's used in the automotive sector for mufflers, exhaust systems, and heat shields. In the appliance industry, it serves as a robust material for oven components, water heaters, and air conditioning units. Crucially, Galvalume is the preferred high-performance substrate for Prepainted Galvalume (PPGL) steel, which is used for premium colored roofing and architectural panels worldwide.
📋 Quality & Certification
Our Certifications
- ✅ ISO 9001:2015
- ✅ CE Marking
- ✅ ABS
- ✅ DNV GL
- ✅ Lloyd's Register (LR)
- ✅ Bureau Veritas (BV)
- ✅ SGS Certified
- ✅ NK
- ✅ RINA
Mill Certificate Type
- 📋 EN 10204 3.1
- 📋 EN 10204 3.2
- 📋 Original Mill Certificate
- 📋 Third Party Inspection Available
- 📋 Certificate of Origin
❓ Frequently Asked Questions
What is Galvalume steel sheet (GL sheet)?
Galvalume steel sheet is a carbon steel sheet coated with a 55% aluminum-zinc alloy through a hot-dip process. This coating, specified by standards like ASTM A792, provides superior corrosion resistance compared to standard galvanized (zinc-coated) steel, offering 2 to 4 times the service life. It is widely used for roofing, wall cladding, and as a substrate for prepainted steel (PPGL).
What is the difference between Galvanized (GI) and Galvalume (GL) steel?
The key difference is the coating. Galvanized (GI) steel is coated with nearly 100% zinc. Galvalume (GL) steel is coated with a 55% aluminum-zinc alloy. This gives Galvalume superior long-term barrier protection against corrosion, especially in atmospheric conditions, resulting in a much longer service life. Galvanized steel offers slightly better sacrificial protection at cut edges. Visually, Galvalume has a smaller, smoother, silvery spangle, while galvanized steel has a larger, more distinct crystalline spangle.
What does AZ150 mean for a Galvalume coating?
The 'AZ' designates an Aluminum-Zinc coating, and the number '150' represents the total minimum coating weight in grams per square meter (g/m²) for both sides of the sheet. Therefore, an AZ150 coating has 150 g/m² of the 55% Al-Zn alloy. This is a common and robust coating class for high-quality roofing and cladding, offering an excellent balance of performance and cost.
What is an Anti-Fingerprint (AFP) coating on Galvalume steel?
Anti-Fingerprint (AFP), also known as acrylic passivation, is a very thin, clear organic coating applied over the Galvalume surface. Its primary purposes are to prevent the surface from turning black or getting stained by fingerprints and moisture during handling and installation, to improve lubricity during roll-forming, and to act as a pre-treatment for subsequent painting.
Is Galvalume steel sheet suitable for painting?
Yes, Galvalume steel sheet is an excellent substrate for painting, and it is the standard base material for high-performance Prepainted Galvalume (PPGL) products. For post-painting, the surface should be properly cleaned and prepared. A sheet with an Anti-Fingerprint (AFP) coating or a chemical passivation treatment will generally provide better paint adhesion than a simple oiled or untreated surface.
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Galvalume Steel Sheet (GL Sheet)
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