28 gauge galvanized steel coil is a zinc-coated steel coil with a thickness of approximately 0.40 mm (0.0157 in). Made from cold-rolled steel with a hot-dip galvanized coating, this galvanized steel coil offers excellent corrosion resistance, durability, and cost-effectiveness. Widely used for roofing, wall cladding, HVAC ductwork, gutters and light construction components, etc. Wanzhi Group operates two galvanizing lines. We offer customized sizes, zinc coatings, spangle types, and surface treatments, along with deep processing services.
What is 28 Gauge Galvanized Steel Coil?
28 gauge indicates the coil thickness based on the gauge measurement system commonly used for steel products. Under this system, a higher gauge number represents a thinner steel coil. This gauge provides lightweight performance, good formability, corrosion resistance, and easy fabrication. It is suitable for roofing, wall cladding, HVAC ducts, and other construction components that require a balance of strength and flexibility.
Specification
| Product Name | 28 Gauge Galvanized Steel (GI) Coil |
|---|---|
| Standard | ASTM / JIS / EN / GB |
| Base Material | Hot rolled or cold rolled steel |
| Thickness | 0.48 mm (0.0157 inch) |
| Width | 600 mm – 1500mm |
| Zinc Coating Weight | Z30–Z275g/m², customized |
| Spangle Type | Big spangles, small spangles, regular spangles, zero spangles |
| Surface Treatment | Passivation, oiling, lacquer sealing, phosphating, etc. |
| Yield Strength | 140–275 MPa |
| Tensile Strength | 270–500 MPa |
| Elongation | ≥22% |
| Coil Weight | 3–8 MT per coil |
| Quality Certificate | SGS, ISO, BV, CE etc. |
| MOQ | 10 tons |
| Delivery Time | 5-45 days |
| Package | Standard export packaging or as per your requirements |
Galvanized Steel Coil Gauge and Thickness Chart
Gauge is a traditional measurement system used to indicate the thickness of galvanized steel coils. Under the US Standard Gauge (MSG) system, a higher gauge number represents a thinner steel coil. For galvanized steel coils, gauge values are commonly converted to metric thickness (mm) for international trade and specification reference.
| Gauge | Thickness (inch) | Thickness (mm) |
| 20 Gauge | 0.0359 in | 0.91 mm |
| 22 Gauge | 0.0299 in | 0.76 mm |
| 24 Gauge | 0.0239 in | 0.61 mm |
| 26 Gauge | 0.0179 in | 0.45 mm |
| 28 Gauge | 0.0157 in | 0.40 mm |
| 29 Gauge | 0.0141 in | 0.36 mm |
| 30 Gauge | 0.0120 in | 0.30 mm |
| 32 Gauge | 0.0097 in | 0.25 mm |
| 34 Gauge | 0.0089 in | 0.23 mm |
Galvanizing Process and Spangle Types
Wanzhi Group provides galvanized steel coils with various galvanizing processes and spangle types, supporting customized solutions for different applications.
Galvanizing Types
- Hot-dip galvanized steel coil (HDG): Hot-dip galvanized steel coil is produced by immersing steel strip in molten zinc at high temperatures, forming a durable zinc coating (Z30-Z275 g/m²). It provides excellent corrosion resistance, strong durability, good formability, and reliable outdoor performance. HDG steel coils are widely used in construction, automotive, manufacturing, and industrial applications.
- Electro-galvanized steel coil (EG): Electro-galvanized steel coil uses an electrochemical process to deposit a thin and uniform zinc coating (Z10-Z50g/m²) on the steel surface. It offers excellent surface quality, high dimensional accuracy, consistent coating thickness, and good paintability. EG steel coils are widely used in appliances, automotive interior parts, electronics, and other applications requiring precise processing and smooth finishes.
Spangle Types
- Regular Spangle: Features visible zinc crystals formed naturally during the galvanizing process, providing a classic galvanized surface appearance.
- Small Spangle: Has smaller zinc crystals and a smoother surface, suitable for applications requiring better surface quality.
- Big Spangle: Features larger zinc crystals with a distinctive pattern, commonly used for general-purpose galvanized products.
- Zero Spangle: Has no visible zinc crystals, offering a smooth surface suitable for painting, coating, and high-quality finishing applications.
28 Gauge Galvanized Steel Coil Manufacturing Process
- Raw Material Preparation: We inspect and prepare high-quality cold-rolled steel coils as the substrate to ensure consistent quality before galvanizing.
- Cleaning & Surface Pretreatment: The cold-rolled steel coil undergoes cleaning and surface pretreatment to remove oil, dirt, and other contaminants, ensuring strong zinc adhesion.
- Continuous Annealing: The steel coil is continuously annealed to improve its mechanical properties, ductility, and formability.
- Hot-Dip Galvanizing: Steel coils pass through a molten zinc bath to form a uniform zinc coating, providing excellent corrosion resistance.
- Coating Thickness Control: Air knives precisely control the zinc coating thickness to achieve the required coating weight and a uniform surface finish.
- Surface Treatment: Passivation, oiling, or anti-fingerprint treatment is applied to improve corrosion resistance and surface protection.
- Quality Inspection: We inspect thickness, width, zinc coating weight, surface quality, and mechanical properties to ensure consistent product quality.
- Coil Finishing & Packaging: The finished galvanized steel coil is slit or cut to customer specifications, securely packaged, and prepared for shipment.
Benefits of 28 Gauge Galvanized Steel Coil
- Excellent Corrosion Resistance: The zinc coating provides reliable protection against rust and extends the service life of the steel coil.
- Lightweight & Easy Handling: With a thickness of approximately 0.40 mm, it offers lower weight and easier transportation and installation.
- Good Formability & Fabrication Performance: It can be easily cut, bent, roll-formed, and processed for various applications.
- Cost-Effective Material Choice: The thinner gauge reduces material consumption while meeting the requirements of many light-duty applications.
- Uniform Surface Quality: The galvanized coating provides a smooth, durable surface suitable for coating, painting, and further processing.
Applications
- Roofing & Wall Cladding: Corrugated sheets, roofing panels, siding, and exterior building systems.
- HVAC Ductwork: Air ducts, ventilation systems, and duct components.
- Construction Components: Light steel framing, ceiling systems, and partition materials.
- Gutters & Drainage: Gutters, downspouts, and drainage components.
- Metal Fabrication: Roll-formed products, stamped parts, and sheet metal components.
28 Gauge Galvanized Steel Coil Prices
The price of galvanized steel coils depends on factors such as steel grade, specifications, zinc coating weight, spangle type, and order quantity. Zero spangle galvanized steel coil requires stricter production processes and more precise temperature control, making it more expensive than regular spangle galvanized steel coil. Standard galvanized steel coils are generally priced at USD 600–800 per ton. Contact us with your required specifications and quantity for an accurate quotation and customized solution!
Galvanized Steel Coil Manufacturer and Supplier – Wanzhi Group
Wanzhi Group is a trusted galvanized steel coil manufacturer and supplier in China. Equipped with advanced production lines for galvanized steel, galvalume steel, prepainted steel, and aluminum-magnesium alloy steel, we have an annual production capacity of 600,000 tons and hold ISO, SGS, and other certifications. From raw materials to finished products, we provide one-stop steel solutions. Further processing services include slitting, welding, stamping, punching, bending, forming, coating, and fabrication. Committed to quality and customer satisfaction, we deliver high-quality steel products and tailored solutions to help customers complete their projects efficiently and successfully.
Wanzhi Group Galvanized Steel Products
Wanzhi Group operates 2 hot-dip galvanizing and 1 electro-galvanizing production lines to supply diversified galvanized steel products. Hot-dip galvanizing supports zinc coating from Z30 to Z275, while electro-galvanizing provides a thin zinc coating of 10–50 g/㎡. All products comply with ASTM, EN, GB and JIS international standards. We deliver deep processing services including cutting, profiling, punching and bending, along with flexible OEM & ODM customization solutions.
Galvanized Steel Coil / Sheet / Strip / Wire & Wire Mesh
GI Profiled Sheet (Corrugated / Embossed / Perforated)
Galvanized Steel Section (Angle / Channel / C&Z Purlin / Square & Rectangular Pipe)
Prepainted Galvanized Steel Coil / Sheet
Wanzhi Steel Factory
Wanzhi factory is located in Boxing County, Binzhou, Shandong, China. Equipped with multiple production lines, a sample room, and a quality inspection center, Wanzhi Group implements strict quality control from raw material selection to production, testing, and packaging, ensuring stable and reliable steel products for customers worldwide.
- Production Capacity & Delivery: In addition to galvanized steel products, Wanzhi supplies hot-rolled steel, cold-rolled steel, galvalume steel, prepainted galvalume steel, prepainted aluminum, ZAM steel, metal corrugated sheets, stainless steel, and other products. We keep standard products in stock for prompt delivery. Customized products can be delivered within 5 to 45 days.
- Certificates: Our factory has obtained ISO9001, ISO14001 and ISO45001 system certifications. We provide original Mill Test Certificates (MTC) with each shipment and support third-party inspections from SGS, BV, TUV, and other organizations. Free samples are also available for customer evaluation and reference.
- Technical Services: We provide product selection guidance, specification recommendations, and installation support. Our professional team offers 24-hour after-sales service to help resolve various technical and project-related issues.
Customer Visits
Wanzhi Group has received visitors from over 40 countries and regions, including Chile, Kazakhstan, Azerbaijan, Singapore, Indonesia, Turkey, Turkmenistan, and the UAE. Visitors can tour our production lines, manufacturing facilities, quality inspection processes, and sample room to gain a better understanding of our manufacturing capabilities. We welcome customers to visit our factory, request samples, or discuss project solutions with our professional team.
Export Experience
Wanzhi Group supplies various metal raw materials and finished steel products to customers worldwide, with markets covering South America, Africa, the Middle East, Southeast Asia, Europe, and other regions. Located near Qingdao Port and Tianjin Port, our factory benefits from convenient transportation and a stable supply chain. We support multiple trade terms, including FOB, CIF, and EXW, and provide export services such as customs clearance, inspection, and shipment booking to ensure efficient delivery.
Packaging & Delivery
Our steel coils and sheets adopt standard export packaging.
Moisture-proof paper and plastic film provide inner rust protection.
Galvanized iron sheets offer outer protection against damage.
Edge protectors reinforce coil and sheet corners.
Fumigated wooden pallets ensure secure loading and transportation.
The packaging helps prevent rust and mechanical damage during sea shipment.
Customized export packaging is also available, including vertical packing and logo printing.
Global Cases
Wanzhi Group has served customers in over 120 countries and regions, including metal material suppliers, construction companies, manufacturers, and engineering contractors. We also provide corrugated sheet roll forming machines and related equipment to support customers’ production needs.
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
Client Reviews
Our clients share their experience with Wanzhi Group’s galvanized steel, galvalume steel, prepainted steel, corrugated metal sheet and other products. Their feedback highlights our product quality, reliable delivery, professional service, and customized solutions. Real customer reviews and testimonials demonstrate our commitment to long-term cooperation.
Looking for 28 gauge or other gauge galvanized steel coil or sheet? Wanzhi Group provides galvanized steel products in various specifications with custom services. Contact us today for an accurate quotation and professional project solutions.