Galvanized Steel Coils (GI) Manufacturer & Supplier in China
Sino East Steel Group operates modern continuous hot-dip galvanizing lines in Tianjin, manufacturing premium quality galvanized steel coils (GI) for construction, roofing, HVAC ductwork, structural profiles, and automotive stampings. Global importers, steel service centers, and EPC contractors source our GI coils across commercial, lock-forming, and structural steel grades with regular, minimized, and zero spangle finishes.
Real Production, Warehouse & Seaworthy Export Packaging
Why Procure Direct from Sino East Steel Group
💰 Direct Mill Pricing
Eliminate intermediate trading markups with transparent factory FOB/CIF pricing and flexible payment terms for volume contracts.
🛡️ Certified EN 10204 3.1 MTC
Full heat-number traceability, guaranteed mechanical/chemical tolerances, and complete third-party inspection (SGS/BV) compliance.
🚢 1x20GP Mixed Cargo Support
Consolidate various sizes, specifications, and hardware fasteners into single 25-ton container loads to minimize inventory overhead.
Manufacturing Specifications & Technical Range
| Standard & Grades | ASTM A653 (CS Type A/B/C, SS Gr.33-80), EN 10346 (DX51D+Z, S250GD-S350GD), JIS G3302 (SGCC, SGH340) |
|---|---|
| Thickness Range | 0.12 mm – 4.00 mm (Tolerance: ±0.015 mm) |
| Width Range | 600 mm – 1,500 mm (Standard: 914mm, 1000mm, 1200mm, 1219mm, 1250mm, 1500mm) |
| Zinc Coating Weight | Z40 – Z275 g/m² (G30 to G90) double-sided total coating |
| Surface Finish | Regular Spangle, Minimized Spangle, Zero Spangle / Skin Passed |
| Surface Treatment | Chromated / Passivated (Cr3+ / Cr6+ Free), Oiled, Anti-Fingerprint (AFP) |
| Coil Weight & ID | 3.0 – 8.0 Metric Tons | Coil ID: 508 mm / 610 mm |
| Supply Capability | 35,000 Metric Tons / Month from Tianjin Manufacturing Base |
| Mill Certificates | EN 10204 Type 3.1 MTC with heat number traceability; SGS, BV, TUV supported |
| Lead Time & Delivery | 15–25 days from contract confirmation; FOB Tianjin / CIF Global Ports |
Frequently Asked Questions for Importers & Contractors
1. What coating designations can your line produce?
Our hot-dip galvanizing lines produce coating designations from Z40 up to Z275 g/m² (G30 to G90). For marine and extreme industrial environments, heavy zinc coatings (Z350 / Z450) and Galvalume (Aluzinc AZ150) are also available.
2. Can coils be slit or cut to length?
Yes. Our factory is equipped with high-speed precision slitting lines (slitting widths down to 50mm) and cut-to-length shearing lines to produce flat galvanized steel sheets and precision strips.
3. What is your minimum order quantity (MOQ)?
Standard trial MOQ is 25 metric tons (1x20GP container), which can combine 2–3 different thicknesses or widths. For customized specialty coating runs, minimum batch is 50 metric tons.
4. What are your payment terms?
Standard export terms are 30% T/T deposit and 70% balance against Bill of Lading (B/L) copy, or 100% confirmed Irrevocable Letter of Credit at sight (L/C at sight) issued by top-tier international banks.
5. What is your production and shipping lead time?
Standard production lead time is 15 to 22 days. With our strategic location near Tianjin Xingang Port, container loading and customs clearance take only 3 to 5 days.
Related Certified Steel Categories for Consolidated Shipments:
Explore our dedicated Aluzinc (Galvalume), PPGI & Galvanized Coils Supplier for Ghana with full GSA standard compliance, G-CAP CoC inspection, and 1x20GP mixed container consolidation.
Ready to Procure Direct from Tianjin Steel Manufacturer?
Contact our senior sales engineers with your required size, grade, coating specification, and destination port. We provide official CIF quotations and MTC samples within 15 minutes.
Heavy Zinc Coating Specification: Z275 & G90 Corrosion Resistance for Coastal & Gulf Projects
For commercial projects exposed to high humidity, coastal salt-spray, or desert climatic extremes (such as UAE, Saudi Arabia, Kuwait, and West Africa), Sino East Steel specializes in high-coating galvanized steel coils conforming to ASTM A653M and EN 10346:
| Zinc Coating Grade | Coating Mass (Triple Spot g/m² / oz/ft²) | Single Side Thickness (µm) | Neutral Salt Spray (NSS) Life | Recommended Applications |
|---|---|---|---|---|
| Z275 / G90 (Standard Heavy) | 275 g/m² / 0.90 oz/ft² | Approx. 20 µm / side | ≥ 240 hours without red rust | C&Z Purlins, solar mounting brackets, roofing sheets |
| Z350 / G115 (Extra Heavy) | 350 g/m² / 1.15 oz/ft² | Approx. 25 µm / side | ≥ 360 hours without red rust | Coastal grain silos, industrial HVAC housings, marine docks |
| Z450 / Z600 (Marine Grade) | 450 – 600 g/m² | Approx. 32 – 42 µm / side | ≥ 500+ hours without red rust | Offshore substations, chemical storage & highway culverts |
Galvanized Steel Coil Processing: Continuous Zinc Pot to Packaging
Sino East operates high-speed continuous hot-dip galvanizing lines with automated air-knife technology that controls zinc layer thickness precisely across the entire strip width (914 mm to 1500 mm). We produce commercial quality SGCC, DX51D, and ASTM A653 coils with zinc coatings ranging from Z40 (regular spangle) up to Z275 (G90 zero/minimized spangle) for export to GCC, West African, and European markets.
Our Tianjin plant incorporates in-line tension levelers, skin-pass mills, and chemical passivation / anti-fingerprint coating units. Slitting lines and cut-to-length shearing lines allow us to supply slit coils from 20 mm width or flat sheets tailored to customer manufacturing schedules.
Key Manufacturing Controls
- Coating Gauge Control - Triple-spot magnetic measurement per coil with documented MTC test data
- Thickness Range - 0.12 mm to 3.5 mm in commercial, lock-forming, and structural steel grades
- Packaging - VCI rust-inhibiting paper, galvanized outer sleeve, steel corner protectors, 4-eye straps
- Logistics - 20GP container loading with heavy-duty timber cradles and moisture desiccant bags