When sourcing JIS G3302 SGCC galvanized steel coil for construction, automotive, or appliance manufacturing, understanding the exact specifications, coating options, and supplier reliability is critical. This guide covers everything from SGCC grades and Z120/Z275 zinc coatings to FOB pricing and global export logistics. As an ISO-certified manufacturer with a Qingdao factory and 15+ years of export experience, ChinaCNU Steel delivers consistent quality at MOQ 25 tons to 80+ countries.
What Is JIS G3302 SGCC Galvanized Steel Coil?
JIS G3302 is the Japanese Industrial Standard for hot-dip galvanized steel sheet and coil. SGCC (Structural Quality Commercial Cold Rolled) is the most common grade under this standard, designed for general forming and bending. The hot dip galvanized coil is produced by immersing cold-rolled steel into a molten zinc bath, creating a corrosion-resistant layer. The zinc coating is designated by weight (e.g., Z60, Z120, Z275) in g/m² for both sides. This GI coil is widely used for roofing, ductwork, electrical enclosures, and automotive panels. The standard also covers chemical composition limits for carbon (max 0.12%), manganese (max 0.50%), and phosphorus (max 0.035%).
Jis G3302 Sgcc Galvanized Steel Coil Price Trend (USD/Ton) – Last 12 Months
Data: ChinaCNU Steel Market Research | FOB Tianjin Reference Price
Key Properties of SGCC Grade
- Yield strength: 170–280 MPa (depending on thickness)
- Tensile strength: 270–500 MPa
- Elongation: Min 20% for thickness under 2.0 mm
- Zinc coating adhesion: Must pass 180° bend test without flaking
- Surface finish: Regular spangle, minimized spangle, or zero spangle available
Zinc Coating Options: Z60, Z120, Z275 – Which to Choose?
The coating weight directly determines corrosion resistance. For JIS G3302 SGCC galvanized steel coil, common designations include Z60 (60 g/m² total both sides), Z120 (120 g/m²), and Z275 (275 g/m²). A higher coating weight provides longer service life but increases cost. In 2026, market demand is shifting toward Z120 for indoor applications and Z275 for outdoor or coastal environments. Our galvanized steel supplier offers all three options with strict ISO 9001 quality control. The coating thickness per side is roughly 4.2 microns per 20 g/m². For example, Z120 equals about 8.4 microns per side.
| Coating Designation | Total Coating Weight (g/m²) | Coating Thickness per Side (microns) | Typical Application | Estimated Corrosion Life (Years) |
|---|---|---|---|---|
| Z60 | 60 | 4.2 | Light indoor use, ducting | 5–8 |
| Z120 | 120 | 8.4 | General construction, roofing | 10–15 |
| Z275 | 275 | 19.3 | Coastal, agricultural, heavy industrial | 20–30 |
SGCC vs Other JIS G3302 Grades
While SGCC is the most common, JIS G3302 also includes grades like SGCH (structural quality for deep drawing) and SGC570 (high tensile). For most buyers, SGCC offers the best balance of formability and cost. Our hot dip galvanized coil meets both JIS G3302 and equivalent ASTM A653 standards. The chemical composition and mechanical tests are verified per batch. In 2026, many engineers specify SGCC for its consistent weldability and paint adhesion. The surface can be chemically treated (chromate or eco-friendly passivation) to prevent white rust during storage.
Common Thickness and Width Range
- Thickness: 0.12 mm to 4.0 mm (tolerance ±0.02 mm for thin gauge)
- Width: 600 mm to 1500 mm (custom slitting available)
- Coil ID: 508 mm or 610 mm
- Coil weight: Up to 15 tons per coil
Why Source from ChinaCNU Steel – Qingdao Factory
With 15+ years export experience and an ISO-certified Qingdao factory, ChinaCNU Steel is a trusted galvanized steel supplier for JIS G3302 SGCC material. We maintain a strict quality management system, from hot-dip galvanizing line to final packaging. Our FOB pricing from Tianjin Xingang port is competitive, with MOQ 25 tons. We export to 80+ countries including USA, UK, UAE, South Africa, and Southeast Asia. Each coil is tested for coating weight, adhesion, and mechanical properties. The standard packaging includes anti-corrosion paper, steel strapping, and seaworthy wooden pallets. For 2026, we have increased production capacity for Z120 and Z275 coatings to meet growing demand.
Quality Certifications
- ISO 9001:2015 – Quality management system
- SGS – Third-party inspection available
- Mill test certificate – Provided with every shipment
- Compliance: JIS G3302, ASTM A653, EN 10143
Pricing and Lead Time for JIS G3302 SGCC Coil
In 2026, the FOB Tianjin price for JIS G3302 SGCC galvanized steel coil with Z120 coating ranges between $680 and $820 per ton, depending on thickness and quantity. Z275 coating adds approximately $60–$90 per ton. For MOQ 25 tons, lead time is 15–20 working days from order confirmation. Larger orders (100+ tons) may qualify for volume discounts. The price includes standard seaworthy packaging and can be adjusted for custom width or special surface treatment. We recommend requesting a quote with your target coating weight and delivery port.
Frequently Asked Questions
1. What is the difference between SGCC and DX51D?
SGCC is a JIS grade for structural quality hot-dip galvanized steel, while DX51D is a European EN 10142 grade for general forming. Both have similar mechanical properties, but SGCC has tighter limits on carbon and manganese. For projects requiring JIS compliance, SGCC is the correct choice. Our GI coil can be supplied with dual certification upon request.
2. Can I get JIS G3302 SGCC with Z275 coating for outdoor use?
Yes. Z275 (275 g/m² total) is ideal for outdoor and coastal environments. We regularly supply Z275 SGCC for solar panel structures and agricultural buildings. The coating provides excellent protection against red rust, even in high-humidity conditions. Ensure proper passivation treatment to avoid white rust during transit.
3. What is the MOQ for custom width?
Our standard MOQ is 25 tons per specification. For custom widths (e.g., 1250 mm or 1350 mm), the MOQ remains 25 tons, but additional slitting costs may apply. We can slit coils to 100 mm width increments. Contact our sales team with your exact width requirement for FOB pricing.
4. How is the zinc coating weight tested?
We use both magnetic thickness gauge and gravimetric method (weighing before and after stripping the coating). The test is performed on three samples per coil. Results are recorded on the mill test certificate. For Z120 coating, the tolerance is ±10 g/m². Our ISO-certified process ensures consistency across all production batches.
5. Do you offer third-party inspection before shipment?
Yes. We welcome SGS, BV, or any other third-party inspection at our Qingdao factory. The cost is typically $400–$600 per container, arranged by the buyer. We also provide free photos and video inspection during packing. This ensures your hot dip galvanized coil meets all specified requirements before loading.
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