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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%).
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?
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| 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 – Boxing, Binzhou Factory
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Quality Certifications
- Certificate records — Review the certificate holder, scope and current verification status. Confirm the documents applicable to your order.
- 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?
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5. Do you offer third-party inspection before shipment?
Yes. We welcome SGS, BV, or any other third-party inspection at our factory in Boxing, Binzhou. 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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