China Galvanized (GI) Steel Coils & Sheets Supplier
Supplying DX51D / SGCC / S350GD+Z galvanized steel with Z60–Z275 coating, meeting ASTM A653, EN 10346, and JIS G3302 standards.
Galvanized (GI) Steel Coil Gallery
Standard GI Coil
Hot-dip galvanized steel coil – bright zinc coating (Z120–Z275)
Regular Spangle
Regular spangle galvanized coil – decorative metallic pattern
Zero Spangle
Zero spangle GI coil – smooth and clean surface finish
Small Spangle
Small spangle galvanized coil – for precision fabrication
Coil Specifications
Galvanized steel coil edge & inner core – 1250 mm width
Export Ready
High-quality galvanized coils ready for export
Need custom specifications or volume pricing?
Why Choose Our Galvanized Steel
Industry-leading quality, competitive pricing, and reliable service for your steel requirements
Factory Direct Supply
We manufacture galvanized (GI) steel coils and sheets on advanced hot-dip production lines, ensuring consistent quality and competitive factory prices.
Customizable Specifications
Available in thickness 0.12–3.0 mm, width 914–1250 mm, and zinc coating Z60–Z275 (G40–G90). Surface finish options include zero, small, or regular spangle.
International Standards
Produced in compliance with ASTM A653, EN 10346, and JIS G3302, meeting global project requirements for construction, manufacturing, and engineering industries.
Certified Quality Assurance
ISO 9001, SGS, and CE certified. Each coil is inspected for coating mass, adhesion, and thickness before delivery, with mill test certificates provided on request.
Fast Delivery & Flexible MOQ
Minimum order quantity 10 tons, with regular lead time 5–45 days depending on specifications and coating type. Stock coils available for urgent orders.
Global Export Experience
Trusted by buyers in over 100 countries, supplying GI steel for roofing, wall panels, and industrial fabrication with reliable logistics and documentation support.
Technical Specifications of Galvanized (GI) Steel
Below are the typical specifications of our hot-dip galvanized (GI) steel coils and sheets. All products are manufactured in compliance with ASTM A653 / EN 10346 / JIS G3302 standards, with customized coating weight, thickness, and surface finish available on request.
| Item | Specification / Description |
|---|---|
| Grade / Material | DX51D, DX52D, DX53D, SGCC, S350GD+Z, S550GD+Z, Q235, etc. |
| Thickness | 0.12 mm – 3.0 mm (up to 6 mm for special orders) |
| Width | 914 mm, 1000 mm, 1219 mm, 1250 mm (custom slit widths available) |
| Coil Weight | 8–12 tons per coil (customizable) |
| Tolerance | Thickness ±0.02 mm / Width ±2 mm (as per EN 10143 / ASTM A924) |
| Zinc Coating (Mass) | 30–275 g/m² (Z30–Z275 / G30–G90) |
| Spangle Type | Zero / Small / Regular / Large |
| Surface Treatment | Chromated, Oiled, Phosphated, Skin-pass, or Dry |
| Substrate | Cold Rolled Steel (CR), Hot Rolled Steel (HR) |
| Yield Strength | 140–550 MPa (depending on grade) |
| Coil ID / OD | ID 508 mm / 610 mm; OD 900–1500 mm |
| Standards | ASTM A653 / EN 10346 / JIS G3302 / GB/T 2518 |
| Inspection Standards | EN 10143 / ASTM A924 (tolerances, coating mass, adhesion) |
| Certificates | ISO 9001, SGS, CE (Mill Test Certificate available) |
| Typical Packaging | Waterproof paper + plastic film + galvanized steel wrap with edge protection |
| Delivery Time | 5–45 days depending on specification and order quantity |
Scroll horizontally to view full specifications →
Standards & Grade Equivalents
Our galvanized (GI) steel products conform to multiple international standards. The following table lists common grade equivalents between ASTM (USA), EN (Europe), and JIS (Japan) standards for easier reference.
| ASTM (USA) | EN (Europe) | JIS (Japan) | Yield Strength (MPa) | Typical Use |
|---|---|---|---|---|
| A653 CS Type B/C | DX51D+Z | SGCC | 140–270 | General forming, roofing sheets |
| A653 SS Grade 33/37 | S220GD+Z | SGHC | 220–270 | Structural use, purlins |
| A653 SS Grade 40 | S250GD+Z | SGCH | 250 | Construction & light framing |
| A653 SS Grade 50 | S350GD+Z | – | 350 | High strength, industrial use |
| A653 SS Grade 80 | S550GD+Z | – | 550 | High tensile, mechanical parts |
| A653 DDS/EDDS | DX52D/DX53D | SECC/SGCD1 | 140–180 | Deep drawing, stamping parts |
Galvanized Steel Surface & Finish Options
Different surface structures and finishes are available to meet various appearance and performance requirements. Each spangle type gives a unique visual texture and corrosion resistance level, suitable for different applications.
Zero Spangle
Appearance: Smooth and uniform surface without visible zinc crystals.
Features: Ideal for painting or precise forming; offers clean, matte finish.
Applications: Appliances, automotive parts, indoor panels.
Small Spangle
Appearance: Fine and evenly distributed crystal pattern.
Features: Balanced aesthetics and protection; good paint adhesion.
Applications: Roofing sheets, wall panels, decorative use.
Regular Spangle
Appearance: Visible zinc crystal pattern formed naturally during solidification.
Features: Traditional galvanized look; excellent corrosion protection.
Applications: Construction, framing, ductwork.
Big Spangle
Appearance: Large, decorative zinc flowers.
Features: Strong visual texture; same corrosion resistance as regular spangle.
Applications: Exposed architectural projects, fences, façade panels.
Applications of Galvanized (GI) Steel & Recommended Coating Solutions
Galvanized (GI) steel is widely used across multiple industries for its strength, corrosion resistance, and versatile surface options. Below are the main application areas and our recommended coating grades for each environment.
Construction & Building
Typical Uses:
Roofing, wall panels, structural beams, ceiling grids.
Recommended Coating:
Z180–Z275 (G60–G90) with small or regular spangle.
Environment:
Outdoor, exposed to weather and humidity.
Why:
Thick zinc layer ensures long-term corrosion protection and durability.
Infrastructure & Engineering
Typical Uses:
Bridges, guardrails, towers, cable trays.
Recommended Coating:
Z275 or higher, chromated & oiled surface.
Environment:
Coastal / industrial zones with high corrosion risk.
Why:
Enhanced zinc coating and passivation prevent rust in harsh environments.
Automotive & Transportation
Typical Uses:
Car body panels, frames, exhaust components, containers.
Recommended Coating:
Z120–Z180, zero spangle, phosphated finish.
Environment:
Moderate; requires smooth surface for painting.
Why:
Excellent formability, weldability, and paint adhesion.
Household Appliances
Typical Uses:
Refrigerator panels, washing machine shells, HVAC casings.
Recommended Coating:
Z60–Z120, zero or small spangle, dry finish.
Environment:
Indoor, controlled humidity.
Why:
Smooth surface ideal for precision forming and coating.
Agriculture & Greenhouses
Typical Uses:
Frames, irrigation systems, fences, barns.
Recommended Coating:
Z180–Z275, regular spangle, oiled surface.
Environment:
High moisture and chemical fertilizers.
Why:
Strong corrosion resistance and cost-effective protection.
Manufacturing & Industrial Equipment
Typical Uses:
Pipes, ducts, enclosures, machinery parts.
Recommended Coating:
Z120–Z180, small or regular spangle, skin-pass.
Environment:
Indoor/outdoor mixed.
Why:
Balanced coating weight and surface strength for fabrication.
Typical Production Range of Galvanized (GI) Steel Coils
Our production lines can manufacture a wide range of galvanized (GI) steel coils and sheets to meet different project needs. Customized sizes and coatings are available upon request.
Standard Range
0.12 mm – 3.0 mm
Up to 6.0 mm for special orders
Most Common
Tolerance
±0.02 mm
EN 10143 / ASTM A924
Customer Visits & Factory Inspections
We regularly welcome clients from around the world to visit our factory, inspect production lines, and verify product quality before shipment. These visits reflect our long-term partnerships and transparent quality control process.
Clients visiting our galvanizing line
Quality inspection before shipment
Technical discussion in factory
Cooperation agreement with overseas buyer
Warehouse inspection with clients
Label and packaging confirmation
Factory Capacity & Facilities
Our galvanized (GI) steel is produced in our own ISO-certified factory equipped with multiple coating and color lines. We maintain a full production chain — from raw material slitting to final packaging — ensuring consistent quality and fast delivery for every order.
8 Production Lines
Including 2 galvanizing lines, 1 Galvalume (GL/ZAM) line, and 3 color coating lines.
600,000 Tons Annual Capacity
Monthly output around 20,000 tons of GI steel coils.
ISO
Certified
8
Production Lines
600K
Tons/Year
20K
Tons/Month
24/7
Production
Packing & Container Loading
Our galvanized steel coils and sheets are securely packed with waterproof paper, plastic film, and galvanized steel wrap. Each coil (5–10 tons) is reinforced with steel straps and edge protection to ensure safe delivery worldwide.
Package size and markings can be customized according to transport or storage requirements.
Steel Coil Protection
Waterproof Packaging
Reinforced Strapping
Container Loading
Custom Marking
Ready for Shipment
Packaging Features
Waterproof
Multi-layer protection
Steel Straps
Reinforced binding
Custom Labels
Flexible marking
Global Shipping
Worldwide delivery
FAQ About Galvanized Steel
Everything you need to know about our GI steel coils and sheets
Our standard minimum order quantity is 10 tons per size or specification. For trial orders or mixed items, smaller quantities can be arranged. We also keep stock coils for standard sizes to support urgent demand.
Delivery usually takes 5–45 days, depending on the coating thickness, order quantity, and production schedule. For standard GI coils (Z60–Z275, 0.4–1.2 mm), regular lead time is around 15–25 days from deposit confirmation.
All galvanized steel products are manufactured in compliance with ASTM A653 / EN 10346 / JIS G3302 standards. We can also produce according to GB/T 2518 or specific project standards if required. Mill Test Certificates (MTC) are provided with each shipment.
Yes, we conduct full inspection before shipment, including coating mass, thickness, adhesion, and surface check. Third-party inspections such as SGS, BV, or Intertek can be arranged at the customer's request. All test data and photos are archived for traceability.
Yes, free samples are available for quality evaluation. We can provide small coil pieces or sheet samples of typical specifications. Courier cost is usually borne by the buyer but refundable upon order confirmation.
We accept T/T (Telegraphic Transfer) — 30% deposit, 70% balance before shipment. L/C at sight is also acceptable for long-term customers. All banking transactions are handled through authorized export channels.
Each coil is packed with moisture-proof paper, plastic film, galvanized steel wrap, and edge protection, then secured with 6–8 steel straps. Our team supervises the entire container loading process to ensure safe delivery to destination ports.
Yes. We can apply custom coil markings, pallet labels, or logos according to your requirements. OEM production under your brand is available for long-term cooperation projects.
We regularly export through Qingdao, Tianjin, and Shanghai ports. Other ports can be arranged based on your location or shipping preference.
Please provide details such as product type (coil/sheet), thickness, width, coating weight (Z/G), quantity, and destination port. Our sales engineer will send you a quotation within 24 hours.
Global Cases of Galvanized Steel
Request a Quotation
Please fill in your contact details and project requirements. Our sales engineer will reply within 1 hour with a customized quotation.