Review certificate records, scope and current status. Confirm order-specific documentation and inspection requirements with the export team.
What Makes S550GD High Strength Galvanized Steel Coil Superior?
Certificate records — Review the certificate holder, scope and current verification status. Confirm the documents applicable to your order.
Typical Applications for S550GD Galvanized Coil
Construction and infrastructure projects benefit greatly from this high-strength GI coil. Common uses include roof purlins, wall cladding, solar panel mounting rails, highway guardrails, and cold-formed steel framing. The material’s high strength-to-weight ratio makes it particularly valuable in seismic zones and for long-span structures. Automotive manufacturers also specify S550GD for chassis components and reinforcement parts where weight savings are essential.
Technical Specifications and Coating Options
Understanding the exact properties of your S550GD high strength galvanized steel coil is crucial for design and fabrication. Below is a detailed comparison of standard specifications available from our stock:
| Property | S550GD Z60 | S550GD Z120 | S550GD Z275 |
|---|---|---|---|
| Yield Strength (MPa) | 550 min | 550 min | 550 min |
| Tensile Strength (MPa) | 560-620 | 560-620 | 560-620 |
| Zinc Coating (g/m²) | 60 (both sides) | 120 (both sides) | 275 (both sides) |
| Coating Thickness (µm) | ~8.4 | ~16.8 | ~38.5 |
| Typical Thickness Range | 0.5-3.0 mm | 0.5-3.0 mm | 0.5-2.5 mm |
| Width Range | 600-1500 mm | 600-1500 mm | 600-1250 mm |
| Coil Inner Diameter | 508/610 mm | 508/610 mm | 508/610 mm |
| FOB Price (USD/ton, 2026) | $780-820 | $840-880 | $960-1020 |
Review certificate records, scope and current status. Confirm order-specific documentation and inspection requirements with the export team.
Why Choose ChinaCNU Steel as Your Galvanized Steel Supplier?
With over 15 years of dedicated export experience, our company has supplied S550GD high strength galvanized steel coil to more than 50 countries worldwide. Our factory in Boxing, Binzhou operates state-of-the-art production lines capable of processing 200,000 tons annually. Key advantages include:
- Certificate records — Review the certificate holder, scope and current verification status. Confirm the documents applicable to your order.
- Competitive FOB Pricing: Direct mill pricing eliminates middleman markups. Our 2026 FOB prices for S550GD Z120 start at $840/ton.
- Flexible MOQ: Standard MOQ is 25 tons per specification, with trial orders of 10 tons available for new customers.
- Export Expertise: Dedicated logistics team handles all documentation, from certificate of origin to bill of lading.
- Technical Support: Engineers assist with grade selection, coating optimization, and fabrication guidance.
Quality Control for Hot Dip Galvanized Coil
Every production batch undergoes rigorous testing including tensile testing, bend testing, and coating weight analysis using X-ray fluorescence. Our S550GD high strength galvanized steel coil is free from spangle defects and edge damage. We maintain a zero-tolerance policy for coating delamination or surface rust. Samples are retained for 5 years for full traceability.
Comparison with Competing Grades
When selecting a GI coil, engineers often compare S550GD with S350GD, S450GD, and DX51D grades. The table below highlights key differences:
| Grade | Yield Strength (MPa) | Typical Application | Relative Cost Factor |
|---|---|---|---|
| S550GD | 550 min | Structural purlins, solar racks | 1.0x (baseline) |
| S450GD | 450 min | Light structural framing | 0.92x |
| S350GD | 350 min | General construction | 0.85x |
| DX51D | 270 min | Roll forming, roofing | 0.78x |
While S550GD commands a premium over DX51D, the ability to use thinner gauges often results in overall project savings of 15-25%. For applications requiring maximum corrosion resistance, the Z275 coating on S550GD provides 4x the lifespan of Z60 in coastal environments.
Global Supply and Logistics
Our factory in Boxing, Binzhou is strategically located near Tianjin Xingang Port, one of the busiest container terminals in China. This allows for efficient loading and competitive ocean freight rates to Europe, the Americas, Southeast Asia, and the Middle East. Typical shipping time to North America is 25-30 days, to Europe 30-35 days, and to Southeast Asia 10-15 days. We offer both FOB and CIF terms. For urgent orders, express air freight is available for small quantities up to 5 tons.
All S550GD high strength galvanized steel coils are packed with anti-corrosion paper, steel strapping, and seaworthy wooden crates for export. Our packaging meets ISPM 15 standards for international shipping. Each coil carries a unique heat number and mill certificate for full traceability.
Frequently Asked Questions (FAQ)
Q1: What is the difference between S550GD and G550 galvanized steel?
A: S550GD and G550 are essentially the same grade under different standards. S550GD is the European designation (EN 10346) while G550 is the ASTM equivalent (A653). Both require minimum 550 MPa yield strength. ChinaCNU supplies both designations depending on your regional specification.
Q2: Can I order S550GD with a coating weight not listed in the table?
A: Yes, we can produce custom coating weights between Z60 and Z275, including Z180, Z200, and Z250. Custom orders require a minimum of 50 tons and lead time of 20-25 working days. Please contact our sales team for pricing and availability.
Q3: What is the standard MOQ for S550GD high strength galvanized steel coil?
A: Our standard MOQ is 25 tons per size and coating specification. For first-time buyers, we accept trial orders of 10 tons at standard pricing. For custom thicknesses or widths, the MOQ is 50 tons.
Q4: How do I verify the quality of your GI coil before shipping?
A: We provide mill test certificates (MTC) with every shipment. Third-party inspection by SGS, Bureau Veritas, or Intertek is available at buyer’s cost. We also offer video inspection of the production and packaging process upon request.
Q5: What is the typical delivery time from your factory in Boxing, Binzhou?
A: For standard sizes and coatings (Z60, Z120, Z275), delivery is 15-20 working days from order confirmation. For non-standard specifications, allow 20-25 working days. Stock items can ship within 7 working days.
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