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Help CenterJIS G3302 Galvanized Steel Coil 1.0-4.0mm Heavy Gauge Z270 Zero Spangle for Construction
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Hemaokang Steel (Shandong) Co., Ltd. is proud to offer the JIS G3302 Galvanized Steel Coil 1.0-4.0mm Heavy Gauge Z270 Zero Spangle – a premium-grade product designed specifically for demanding construction applications. With our factory located in Liaocheng, Shandong, China, and an annual export value of US$50 million to US$100 million, we combine advanced manufacturing expertise with strict quality control under ISO9001 certification. This heavy-gauge galvanized coil provides superior corrosion resistance, excellent formability, and a clean, spangle-free surface that is ideal for painting or direct use in structural components. Whether you are building industrial roofs, wall cladding, or load-bearing frames, our coil delivers consistent performance and long-term durability.
The Z270 coating weight (270 g/m² total both sides) ensures robust protection against rust and environmental damage, while the zero spangle finish offers a smooth, uniform appearance that meets modern architectural aesthetics. Our coils are manufactured in strict compliance with JIS G3302 standards, covering thicknesses from 1.0mm to 4.0mm, making them suitable for heavy-duty construction needs. Below we detail the key features, technical specifications, and benefits that make this product a preferred choice for contractors and fabricators worldwide.
Key Features & Advantages
- Heavy Gauge Range (1.0-4.0mm): Provides exceptional structural strength, suitable for load-bearing applications such as purlins, roof trusses, and industrial panels.
- Z270 Zinc Coating: Offers high corrosion resistance with a minimum coating mass of 270 g/m² (triple-spot test), extending service life in humid or coastal environments.
- Zero Spangle Surface: Eliminates the typical spangle pattern, resulting in a smooth, uniform finish that improves paint adhesion and aesthetic appearance – ideal for visible architectural elements.
- JIS G3302 Compliance: Meets Japanese Industrial Standard for hot-dip galvanized steel sheets and coils, ensuring reliable mechanical properties and dimensional tolerances.
- Excellent Formability: Suitable for bending, stamping, and roll-forming without flaking or cracking, thanks to optimized steel chemistry and galvanizing process.
- Consistent Coil Dimensions: Available in widths from 600mm to 1500mm, with inner diameters of 508mm or 610mm, and coil weights up to 10 tons to suit different production lines.
- Customizable Options: We can provide different grades (e.g., SGC400, SGC490), surface treatments (chromated, oiled, or dry), and packaging according to customer requirements.
Technical Specifications (Typical Values)
| Parameter | Value |
|---|---|
| Standard | JIS G3302 |
| Thickness Range | 1.0 mm – 4.0 mm (including 0.01 mm tolerance) |
| Coating Weight (Z270) | 270 g/m² (minimum 3-point average) |
| Surface Finish | Zero Spangle (smooth, no visible crystals) |
| Grade Examples | SGC400, SGC490 (yield strength ≥ 400 MPa, 490 MPa) |
| Width | 600 – 1500 mm (customizable) |
| Coil Inner Diameter | 508 mm or 610 mm |
| Coil Weight | 3 – 10 tons (depending on size) |
| Zinc Coating Type | Hot-dip galvanized (continuous process) |
| Surface Treatment | Chromated / oiled / dry (optional) |
Benefits for Your Construction Projects
- Longer Lifespan: The Z270 coating provides up to 2–3 times the corrosion resistance of lower coating weights, reducing maintenance costs over the building’s life.
- Improved Aesthetics: Zero spangle surface gives a sleek, modern look that can be left unpainted in some architectural styles, or easily painted for color matching.
- Ease of Fabrication: Heavy gauge material still maintains good ductility, allowing for complex shapes without cracking – perfect for roll-formed profiles used in roofing and siding.
- Compliance with International Standards: JIS G3302 is recognized globally, making our coil suitable for export projects in North America, Europe, Southeast Asia, and beyond.
- Reduced Waste: Tight dimensional tolerances and consistent coating distribution minimize scrap during cutting and stamping operations.
Why Choose Hemaokang Steel?
As a newly established enterprise in 2025, Hemaokang Steel (Shandong) Co., Ltd. has quickly grown to serve a global market with an annual export value exceeding US$50 million. Our team of 51–100 experienced employees is dedicated to ensuring every coil meets the highest quality standards. We are ISO9001 certified, which means our production, inspection, and delivery processes are systematically controlled. Our main markets include North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and many other regions – a testament to our reliability and competitiveness.
We offer flexible packaging options (sea-worthy export packaging, with or without inner wrapping), fast lead times, and responsive customer service. Whether you need a small trial order or a large container shipment, we are ready to support your construction projects with high-quality heavy-gauge galvanized coils. Contact us today for a quotation or technical consultation.
Frequently Asked Questions (FAQ)
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Q: What does “Z270” mean in the product name?
A: Z270 refers to the total zinc coating weight of 270 g/m² (measured on both sides of the sheet). This is a standard designation under JIS G3302, providing good corrosion protection for construction applications. -
Q: Is this coil suitable for outdoor use in coastal areas?
A: Yes, the Z270 coating offers enhanced corrosion resistance compared to lower coating weights (e.g., Z180). However, for extremely aggressive marine environments, we recommend consulting our technical team for possible additional protection options. -
Q: Can I get a different thickness or width than the standard range?
A: We offer customization within certain limits. Thicknesses from 1.0mm to 4.0mm are standard; widths from 600mm to 1500mm are available. Please contact us with your specific requirements. -
Q: What is the difference between zero spangle and regular spangle?
A: Zero spangle is produced by controlling the zinc solidification process to suppress the formation of visible spangle crystals. This results in a smooth, uniform surface that is preferred for painting or when a clean appearance is required. Regular spangle has visible flower-like patterns. -
Q: Do you provide samples before bulk order?
A: Yes, we can provide small sample coils (typically 1–2 meters) for evaluation. The sample may be subject to a nominal fee, which is refundable upon placing a formal order. -
Q: How is the coil packaged for export?
A: Standard export packaging includes steel pallets, waterproof wrapping, edge protectors, and steel strapping. We can also add inner moisture-proof paper and fumigation-free wooden crates as required. -
Q: What is the typical lead time for this product?
A: For standard sizes, lead time is approximately 15–25 days after receiving the deposit. Custom orders may require additional time. We recommend confirming with our sales team for current availability. -
Q: Can this coil be used for roofing and wall panels?
A: Absolutely. The heavy gauge (1.0–4.0mm) and zero spangle finish make it ideal for forming structural roofing sheets, wall cladding, and even floor decking. The material’s strength and corrosion resistance are well-suited for such applications.
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