Wanzhi Group – China GI GL Steel Manufacturer and Supplier. As a leading GI (Galvanized Iron) and GL (Galvalume Steel) manufacturer, Wanzhi Group offers a comprehensive range of specifications, coatings, and processing services. Our products are widely used in construction, automotive, home appliances, agriculture, and industrial sectors, providing cost-effective and durable solutions.
GI GL Steel Material Specifications
GI (Galvanized Iron) and GL (Galvalume Steel) are corrosion-resistant steel materials with metallic coatings. GI features a pure zinc layer, while GL combines aluminum, zinc, and silicon for enhanced performance.
| Parameter | GI (Galvanized Iron) | GL (Galvalume Steel) |
|---|---|---|
| Base Material | Cold-rolled steel sheet | Cold-rolled steel sheet |
| Coating Type | Pure zinc (98–99% Zn) | Al-Zn alloy (55% Al, 43.4% Zn, 1.6% Si) |
| Coating Weight | 30–350 g/m² (Z60–Z275) | 30–350 g/m² (AZ100–AZ200) |
| Int’l Standards | ASTM A653 (GI), JIS G3302 (SGCC) | ASTM A792 (GL), EN 10346 (DX51D+AZ) |
Galvanized Galvalume Properties
| Properties | GI (Galvanized Steel) | GL (Galvalume Steel) |
|---|---|---|
| Corrosion Resistance | Zinc layer sacrificial anode protection, salt spray resistance 500-1000 hours | Aluminum layer passivation protection + zinc sacrificial anode, salt spray resistance 1500-3000 hours |
| Heat Resistance | ≤200℃ (zinc oxidizes easily at high temperature) | ≤315℃ (aluminum layer resistant to high temperature oxidation) |
| Electrical Conductivity | Low resistivity (suitable for grounded components) | Poor conductivity of aluminum layer (requires special treatment for electrical connections) |
| Thermal Conductivity | 50 W/m-K (low, suitable for insulation) | 140 W/m-K (ideal for heat dissipation) |
| Processability | Good ductility, suitable for deep drawing | High hardness of the plating layer (requires lubrication to prevent cracking) |
| Weldability | Easy to weld (control of zinc vapors required) | Special welding consumables required (aluminum layer prone to porosity) |
| Appearance | Regular zinc plating (smooth/small zinc plating) | Silver-white matte metallic texture |
| Cost | Low (sensitive to zinc price fluctuations) | Higher (aluminum content increases cost) |
Quality Assurance (QA)
- GI Steel Certification: ISO 9001, ISO 1461 (hot dip galvanizing standard) ASTM B117 (salt spray test), ASTM A653, EN 10346, JIS G3302, etc.
- GL Steel Certification: ASTM A792/A792M (Aluminum Zinc Steel Standard) AS 1397 (Australian Standard Aluminum Zinc Steel for Construction), GB/T 14978, etc.
Advantages and Applications
Galvanized steel and galvanized aluminized steel (GI GL steel) are two metals with excellent corrosion resistance that are used in a wide range of applications such as construction, automotive, appliances, and agricultural facilities. Galvalume steel has a higher initial cost than galvanized steel and is better suited for applications in high temperatures and harsh environments, providing a longer service life and greater corrosion resistance.
GI Galvanized Steel
Wanzhi Group’s popular galvanized steel products include galvanized steel sheets, galvanized pipes, galvanized wires, which are widely used in construction, automotive, agriculture, piping system and other fields.
Advantage
- Cost-effective: Hot-dipped galvanized steel, in particular, is low-cost and ideal for projects with limited budgets.
- Strong adhesion: the zinc layer is bonded to the steel, providing long-term protection, and high zinc-coated galvanized steel has a service life of up to 50 years.
- Corrosion Resistance: Suitable for a wide range of climatic conditions, it maintains its durability for a long time in a variety of harsh environments.
- Easy to weld: compatible with standard welding techniques.
Areas of application
- Construction industry: roofs, walls, drains, window frames, gutters, structural frames, etc.
- Automotive industry: automotive parts such as body structures, chassis, doors, body panels, chassis components.
- Home appliances: shell and internal structural components for refrigerators, air conditioners, washing machines, etc.
- Power industry: power pylons, utility poles, etc.
- Agricultural facilities: agricultural greenhouses, water storage tanks, grain bins, seedling frames, etc.
GL Galvalume Steel
GL Galvalume Steel Sheet, GL Tubes and GL Coils have superior physical and chemical properties and are more suitable for high temperature/high humidity and corrosive environments.
Advantages
- Excellent corrosion resistance: Resistant to high temperatures, humidity and chemicals, ideal for outdoor, coastal and chemical environments.
- Durability: Aluminum-zinc alloys last 3-6 times longer than galvanized alloys.
- Heat Reflectivity: Reflects up to 80% of solar radiation, reducing cooling costs and improving light conditions in greenhouses.
- High temperature stability: suitable for industrial chimneys and exhaust systems.
- Aesthetics: Silver-white appearance, more decorative.
Applications
- Construction industry: roofs, decorative facades and other structures in outdoor environments and fire protection equipment.
- Home appliance industry: hot water heaters, ovens and other product shells in high temperature environments.
- Automotive industry: automotive exterior, interior and exhaust system components.
- Solar industry: solar panel backing, power plant cladding, solar panel exterior frames.
- Agricultural facilities: storage sheds, greenhouses, water storage, agricultural irrigation systems, etc.
- Marine Engineering: Coastal: bridges, marine platforms, seawater resistant structures.
GI GL Steel Price
Wanzhi Group provides competitive pricing for GI and GL steel, tailored to project requirements. GI Steel: 600–900 per ton (bulk discounts available). GL Steel: 650–1,000 per ton (custom coatings increase cost). Contact us for volume pricing and OEM/ODM services.
Customization Services – Wanzhi Group
Coating Customization: Choice of Zinc, Aluminum-Zinc, Zinc-Aluminum-Magnesium coating weights (e.g. Z275, AZ150).
Finishes: Matte, gloss, embossed, embossed, printed or fingerprint resistant textures.
Finishing: Precision cutting, roll forming, perforating, bending, painting.
Sizes: Customized thicknesses (0.15-6mm) customized widths (up to 1,500mm) and lengths (rolls/sheets).
Surface structure: corrugated, trapezoidal, ribbed, tile-like, etc.
Production Process
Steel Preparation: Degreasing and cleaning.
Coating: Hot-dip galvanizing (GI) or Al-Zn alloy bath (GL).
Passivation: Chromate-free treatment for enhanced adhesion.
Quality Control: Salt spray tests, coating thickness checks, bend tests.
GI GL Steel Manufacturer and Factory
If you are looking for zinc coated steel or zinc-aluminum alloy coated steel suppliers, then Wanzhi Group is your ideal partner, Wanzhi is a coated steel factory supplier from China, we have galvanized and painted steel production line in Boxing County, Binzhou City, Shandong Province, China, with an annual production capacity of 600,000 tons, and we are a professional GI GL steel OEM ODM. Whether you are choosing high quality steel for a project or looking for a cost-effective solution, you can get the answer at Wanzhi. Whether you are looking for a high quality steel for your project or a cost-effective solution, you can find the answer at Wanzhi!
Wanzhi Steel GI GL Factory
Our factory is capable of producing coils, plates and offers processing services for strips, corrugated sheets, tubes, profiles, wire mesh, painted steel, etc. The factory is ISO14001, ISO14001 certified. Our ISO14001, ISO9001 certified factory provides metal materials for construction and industrial applications in accordance with international standards such as EN, JIS, GB, ASTM. We can also provide samples and welcome inquiries.
Customer Feedback
Galvanized steel and Aluminum zinc plated steel are our popular coated steel products, and so far, we have supplied metal materials of different specifications, material grades and finishes to more than 100 countries and regions, let’s read what our customers say about Wanzhi Steel!
Material Recommendations
If you’re not sure what grade and thickness of GI GL steel is the most cost-effective choice, leave us a message to find out! We can recommend the most suitable material for your local climate.
| Application | Requirements | Recommended Materials | Alternatives |
|---|---|---|---|
| Roofing/warehouse racking | Low cost, corrosion and erosion resistance | GI (GI Z120 coating) | GL AZ70 |
| Coastal structures | Excellent resistance to salt spray, service life in excess of 30 years | GL (AZ200 coatings) | PPGI/PPGL |
| Solar panels | High reflectivity and thermal stability | GL (AZ150 coatings) | ZAM |
| Automotive exhaust pipes | High temperature + corrosion protection | GI (Z275 coatings) | Stainless steel |
| Stamped parts | Complex stamping | GI DX51D+Z | GL (Pre-lubricated coating required) |
Wanzhi Group delivers tailored GI and GL solutions to meet global standards. Contact us for samples, certifications, and project-specific quotes!