Galvanized steel coil, also known as GI coil, is a fundamental steel product where a continuous steel strip is coated with a layer of zinc through a hot-dip process. This hot dip galvanized coil offers superior corrosion resistance, forming a protective barrier that significantly extends the service life of the steel. Sourced directly from a leading zinc coated steel coil factory, ChinaCNU Steel provides high-quality galvanized coils suitable for a vast array of industrial and construction applications, combining durability with cost-effectiveness for global projects.
Product Specifications
Our galvanized steel coils are manufactured to meet international standards, offering a versatile range of specifications to match precise project requirements. Below is a detailed overview of our standard product parameters.
| Grade | Thickness (mm) | Width (mm) | Zinc Coating (g/m²) | Standard |
|---|---|---|---|---|
| DX51D, DX52D, DX53D, SGCC, SGCH | 0.12 – 3.0 | 600 – 1500 | 40 – 275 | ASTM A653, JIS G3302, EN 10346, GB/T 2518 |
| Q195, Q235, SGC400, SGC440 | 0.8 – 2.5 | 800 – 1300 | 60 – 180 | ASTM A653, JIS G3302 |
| Structural Grades | 1.5 – 3.0 | 900 – 1250 | 100 – 200 | ASTM A653, EN 10346 |
Applications
The durability and corrosion resistance of hot dip galvanized coil make it an indispensable material across numerous sectors. Its primary uses include:
- Construction & Building: Roofing and wall cladding, structural frames, purlins, and ceiling systems.
- Automotive Industry: Body panels, chassis components, and various underbody parts.
- Home Appliances: Housings for washing machines, refrigerators, air conditioners, and microwave ovens.
- Agriculture & Farming: Grain silos, animal pens, greenhouse structures, and irrigation systems.
- Industrial Manufacturing: Ductwork, electrical cabinets, cable trays, and storage racks.
- Other Uses: Highway guardrails, signage, and general fabrication where long-term rust protection is critical.
Why Choose ChinaCNU Steel
Selecting the right supplier for your galvanized steel coil is crucial for project success. Here’s why global buyers trust ChinaCNU Steel:
- Direct Factory Source: We are a professional steel mill in Qingdao, China, ensuring competitive pricing and complete quality control from production to delivery.
- Proven Expertise & Certifications: With over 15 years of export experience to 80+ countries, we hold ISO 9001 certification and provide SGS inspection reports upon request.
- Flexible Order Quantities: We accommodate both large and mid-size projects with a manageable Minimum Order Quantity (MOQ) of 25 tons.
- Reliable Lead Times: We guarantee efficient production and shipping, with a standard lead time of 15 to 25 days after order confirmation.
- Secure Export Packing: Coils are securely packed with waterproof paper, steel straps, and wooden pallets or cradles to ensure damage-free arrival.
- Global Logistics Support: We have extensive experience handling exports to Africa, the Middle East, Southeast Asia, and South America, offering FOB Tianjin terms.
PPGI/GI Pricing
As a direct factory, ChinaCNU Steel offers highly competitive pricing for both Galvanized Steel Coil (GI) and Pre-Painted Galvanized Iron (PPGI). Our prices are quoted on an FOB Tianjin basis and are influenced by daily raw material costs (zinc and steel), coil specifications (grade, thickness, coating), and international market trends. For the most accurate and up-to-date factory price, we strongly recommend submitting your detailed specifications to receive a free, no-obligation quote tailored to your needs.
FAQ
What is the difference between GI coil and PPGI coil?
GI coil refers to the base product—steel coated with a protective layer of zinc. PPGI coil takes this a step further; it is a galvanized steel coil that has subsequently been painted with a colored coating on one or both sides, offering enhanced aesthetics and additional protection against weathering, making it ideal for architectural cladding.
What are the standard payment terms for importing galvanized steel sheets from China?
Our standard and most secure payment terms for international buyers are by T/T (Telegraphic Transfer) or L/C (Letter of Credit). We typically require a deposit via T/T before production, with the balance paid before shipment, ensuring a smooth and trusted transaction for both parties.
How do I determine the correct zinc coating weight for my project’s environmental conditions?
Selecting the right zinc coating thickness (measured in g/m²) is key for longevity. For harsh environments with high humidity or industrial pollution, a heavier coating like Z180 or Z275 is recommended. For indoor or mild atmospheric conditions, a standard coating like Z60 or Z90 may be sufficient. Our technical team can advise based on your specific application.
Can you supply small quantities of pre-painted galvanized steel for a test project?
While our standard MOQ for bulk orders is 25 tons, we understand the need for sample testing. We can often arrange smaller sample quantities of our pre painted galvanized steel coils for product verification. Please contact our sales team with your specific request to check feasibility.
Get Factory Price for Galvanized Steel Coil
Send us your specs and get a free FOB Tianjin quote within 24 hours.
Related Steel Coil Resources
Compare PPGI prepainted steel coil, Galvalume steel coil and our galvanized steel factory. For a faster RFQ, use the steel coil weight calculator or check the PPGI RAL color chart.
How to Specify Galvanized Steel Coil
The most reliable way to compare GI coil offers is to issue one written specification to every mill. The following items have the greatest effect on forming performance, corrosion protection and landed cost.
| Decision | Common options | Why it matters |
|---|---|---|
| Steel grade | DX51D, DX52D, SGCC, ASTM A653 commercial steel | Controls forming behaviour, strength and applicable standard. |
| Zinc coating | Z60–Z275 | Higher coating mass generally provides more zinc available for corrosion protection. |
| Thickness | Nominal thickness plus agreed tolerance | Small tolerance differences change yield per tonne and finished-sheet stiffness. |
| Surface | Regular, mini or zero spangle; passivated or oiled | Affects appearance, storage and suitability for painting or fabrication. |
| Coil format | Width, ID, OD/weight and edge condition | Must match the slitter, roll former and lifting equipment. |
GI coil RFQ template
Send: grade and standard; nominal thickness and tolerance; width; zinc coating; spangle and surface treatment; coil ID and target weight; monthly quantity; destination port; required inspection and documents.
Pre-shipment checks
- Verify thickness and width at multiple positions across representative coils.
- Confirm zinc coating and mechanical results against the purchase specification.
- Check edge quality, surface defects, coil shape and protective packing.
- Match coil numbers on labels, packing list and mill test certificate.
Steel coil calculator · Z275 coating guide · DX52D vs DX51D · Request a GI quote
Supplier Verification Center
Verify the specification, production evidence and shipping documents before placing an order. ChinaCNU provides public product documents and project evidence so buyers can complete due diligence before requesting a final quotation.
Product documents
Review downloadable PPGI, GI and Galvalume specification sheets, then request the current document revision with your quotation.
Factory and shipment evidence
Review production, packing, container loading and customer project images. Request order-specific photos before shipment.
Quality verification
Ask for a sample mill test certificate, inspection scope, coil-label format and packing method that match your purchase specification.
Send your specification for verification · Email: sales@chinacnu.com · WhatsApp: +86 191 5431 6688