GL Sheet, fully known as Aluzinc Steel Sheet (also referred to as Aluminum-Zinc-Magnesium Coated Steel Sheet), is an upgraded product of GI Sheet. It is a cost-effective, long-lasting protective solution. With its unique “55% Aluminum – 43.4% Zinc – 1.6% Silicon ternary alloy coating”, it achieves an excellent balance of corrosion resistance, heat resistance, and economy. It is widely used in coastal construction, high-temperature industries, high-end appliances, and other fields that demand higher requirements for corrosion and weather resistance.
GL Sheet Process
Wanzhi GL Sheet is produced using a continuous hot-dip process. The steel substrate is immersed in a molten bath of aluminum-zinc-silicon alloy (approx. 600°C), forming a dense alloy coating. After cooling, the coating exhibits a unique bright silver spangle. The GL coating combines the oxidation resistance of aluminum, the cathodic protection of zinc, and the optimizing effect of silicon. This results in a product with a corrosion resistance lifespan 2-4 times that of pure zinc coatings under equivalent conditions. It also boasts excellent heat resistance (withstanding temperatures up to 315°C) and heat reflectivity, specifically designed for harsh outdoor, high-temperature, and coastal environments.
GL Sheet Substrate
The substrate determines the mechanical properties and formability of the GL Sheet. Tell us the material grade or application you need, and get a free solution and quote.
Commercial Grade (e.g., DX51D+AZ, DC51D+AZ (EN 10346))
- Good flatness and general formability, suitable for building envelopes, general structural components, ventilation ducts, etc.
Structural Grade (e.g., S350GD+AZ, Q235B+AZ (GB/T 12754))
- High strength, yield strength ≥350MPa, suitable for load-bearing purlins, building frames, shelves, and other load-bearing structures.
Drawing Grade (e.g., DX53D+AZ, DC53D+AZ (EN 10346))
- Higher elongation (≥24%), suitable for components requiring shallow drawing or roll forming, such as some appliance housings.
Deep Drawing Grade (e.g., DX56D+AZ, DC56D+AZ (EN 10346))
- Excellent ductility (elongation ≥30%), capable of meeting complex deep drawing needs, used for high-end precision components.
GL Sheet Chemical Composition
The chemical composition of GL Sheet, including both substrate and coating, is the foundation of its stable performance.
Substrate
| Element | Content Range (mass fraction) |
| C | ≤0.12% |
| Si | ≤0.05% |
| Mn | ≤0.50% |
| P | ≤0.035% |
| S | ≤0.035% |
Coating
Aluminum-Zinc alloy (typical composition: 55% Al, 43.4% Zn, 1.6% Si).
| Coating Designation | Total Double-Side Weight (g/m²) | Average Thickness per Side (μm) | Corrosion Resistance Reference (Time to Red Rust) |
| AZ100 | 100 | 20 | Moderate Industrial Environment >15 years |
| AZ120 | 120 | 24 | High Humidity/Coastal Environment >20 years |
| AZ150 | 150 | 30 | Severe Industrial/Marine Environment >25 years |
GL Sheet Mechanical Properties
| Substrate Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%, L0=80mm) | Bending Performance (180°) |
| Commercial Grade | ≥190 | 270-410 | ≥18 | Bend Radius = 2t |
| Structural Grade | ≥235 | 375-500 | ≥22 | Bend Radius = 3t |
| Drawing Grade | ≥180 | 260-380 | ≥24 | Bend Radius = 1t |
| Deep Drawing Grade | ≥170 | 250-360 | ≥30 | Bend Radius = 0.5t |
GL Sheet Dimensions
Wanzhi Group supplies GL Sheet with thickness: 0.15mm – 6.0mm, width: 600mm – 1250mm (slitting available), length: 1000mm – 6000mm (customizable). We offer comprehensive custom sizing services.
Dimensional Tolerances
- Thickness tolerance ±0.03mm, Width tolerance ±1.5mm, Length tolerance ±3mm
Sheet Weight Calculation
- Weight (kg) = Thickness (mm) × Width (m) × Length (m) × 7.85
GL Sheet Common Gauge to mm Conversion Table
| Gauge No. | Calculated Thickness (mm) | Industry Common Thickness (mm) | Typical Application |
| 14 | 1.902 | 1.8-2.0 | Steel structure purlins, load-bearing brackets |
| 16 | 1.526 | 1.5-1.6 | Industrial equipment housing, large pipe protection |
| 18 | 1.150 | 1.1-1.2 | Building profiled sheet |
| 20 | 0.774 | 0.75-0.8 | Appliance back panels, lightweight cladding |
| 22 | 0.400 | 0.4-0.45 | Precision stamping parts, electronic device housings |
| 24 | 0.026 | 0.3-0.35 | Ultra-thin decorative panels, battery casings |
| 26 | -0.348 (no practical meaning) | 0.25-0.3 | Special ultra-thin applications |
GL Sheet Raw Material (GL Coil)
GL Sheet is produced by leveling and shearing GL steel Coil (Aluzinc Steel Coil). We have professional GL coil production lines and also offer additional services like coil leveling and precision slitting.
| Thickness | 0.15 – 3.0mm |
| Width | 600 – 1250mm |
| Inner Diameter | 508mm / 610mm |
| Quality Standards | Complies with ASTM A792 / EN 10346 |
| Coil Weight | 8 – 10 tons, customization supported. |
| Storage | Dry indoor storage to prevent condensation. |
| Surface Treatment | Oiling, phosphating, passivation, etc. |
GL Sheet Finished Products
The processing forms for GL Sheet finished products are similar to those for GI Sheet. Besides leveling and slitting, Wanzhi Steel Factory can also provide services like bending, stamping, punching, painting, and composite processing.
Profiled Sheet (Aluzinc Profiled Sheet)
GL Coil is roll-formed into various profiles (corrugated, trapezoidal, standing seam), with lengths customized as required. Used as high-performance roofing/wall panels, especially ideal for photovoltaic mounting substrates, large-span buildings, coastal structures, and industrial plants demanding extreme corrosion and weather resistance.
Advantages: Stronger wind load resistance, ultra-long lifespan, high heat reflectivity, excellent salt spray corrosion resistance, aesthetically pleasing and bright.
GL Sheet (face/back sheet) + insulation core material (rock wool, polyurethane, glass wool) composite formation. Used for partition walls, façades, enclosures, etc., in chemical plants, seafood markets, coastal cold storage, food processing plants with high requirements for corrosion, heat, and moisture resistance.
Advantages: Corrosion-resistant, heat-resistant, thermally insulating, soundproof, high strength, long lifespan.
High-performance coatings (PE, HDP, PVDF, SMP, etc.) are applied to the surface of high-quality GL Coil and cured at high temperature (220-250°C) to form a colored coating. Its weather resistance is 2-3 times that of PPGI Sheet.
Core Features: Superior weather resistance, long-lasting color/ excellent fade resistance, combines decorative appeal with protective properties.
GL Sheet Factory – Shandong Wanzhi Steel
Wanzhi Group‘s GL sheet production base is located in Binzhou, Shandong, integrating hot rolling, coating, and deep processing. The factory is certified with ISO9001, ISO14001, and other systems, strictly adhering to international standards for product quality.
- Core Equipment: 1 high-speed continuous hot-dip Aluzinc line (monthly capacity 10,000 tons), high-precision leveling lines, multi-specification profiled sheet / sandwich panel production lines.
- Product Standards: Complies with GB/T 14978 (China), ASTM A792 (USA), EN 10346 (EU), JIS G3321 (Japan). Supports third-party testing by SGS, BV.
- Delivery Capability: Standard specifications shipped within 7 days, custom products delivered within 45 days.
- Free Samples: Free samples available (1-2㎡ per specification), sample orders are supported.
GL Sheet Price
GL Sheet price is usually calculated per ton or per square meter. It is mainly influenced by substrate specification, coating weight (AZ100/AZ120/AZ150), surface finish (oiled, phosphated, passivated, fingerprint-resistant, laminated), processing method (sheet/profiled/pre-painted), order quantity, and special requirements. Currently, our galvalume steel sheet price is approximately 600-1000 USD/ton. Please provide your specific requirements for an accurate quote.
GL Sheet Applications
With its unique properties of high corrosion resistance, high heat resistance, and high weather resistance, GL Sheet is increasingly becoming the material of choice for high-end anti-corrosion applications.
Construction Field
- High-end roofing/walling for chemical, paper, metallurgy plant enclosure systems.
- Gutters, downpipes, ventilation ducts.
Appliance Field
- Oven, microwave, heater, fireplace liners and housings.
- High-end appliance housings (can be upgraded to PPGL, VCM sheet).
- Water heater inner tanks.
- Solar thermal collector back plates.
Agriculture & Livestock Farming
- Livestock/poultry house roofing.
- Grain silo and warehouse cladding materials.
Industry & Transportation
- Exhaust system heat shields.
- Chassis components.
- Highway barriers.
- High-durability noise barriers along railways.
Customer Feedback
Our GL Sheet and its products have been exported to over 100 countries and regions worldwide, playing a significant role in agriculture, industry, construction, transportation, education, and other fields. Let’s see what our customers have to say about their experience!
If you are looking for a longer-lasting, more reliable corrosion-resistant metal material for your project, GL Sheet will be your ideal choice. Wanzhi Group looks forward to providing you with a one-stop solution from material to processing.