Galvanized Steel Coil Manufacturer & Supplier – Sino East Steel Group
Sino East Steel Group is a professional galvanized steel coil manufacturer and supplier based in Tianjin, China. Founded in 2008 and certified to ISO 9001:2015, our factory has supplied galvanized sheet coil wholesale programs and project orders to buyers in more than 80 countries. As a factory-direct GI coil factory, we sell hot-dipped galvanized steel coil, pre-painted galvanized coil (PPGI) and galvalume coil at mill-level pricing, with a flexible minimum order of 5 tons for stock sizes and 20 tons for custom specifications. Standard production and delivery cycles run 15–30 days, and all cargo ships from Tianjin Xingang Port under FOB, CIF, CFR or DDP terms.
Our galvanizing lines cover coils from 0.12 mm to 4.0 mm in thickness and 600 mm to 1250 mm in width, with zinc coating weights from Z60 to Z275 g/m². Annual production capacity for galvanized and color-coated products exceeds 200,000 tons, supported by in-house pickling, cold rolling, galvanizing and slitting operations. Every coil is produced against ASTM A653, EN 10346, JIS G3302 or GB/T 2518, and each shipment can be accompanied by a full mill test certificate as well as third-party inspection reports from SGS, BV or TÜV.
Why Choose Sino East Steel Group as Your Galvanized Steel Coil Supplier?
Choosing the right galvanized steel coil supplier is a long-term decision: the coating quality of the GI coil determines how many years of service your building, appliance or automotive part will deliver. Sino East Steel Group combines more than 30 years of manufacturing experience with modern processing lines and disciplined quality control, which is why construction contractors, trading houses and OEM manufacturers across Asia, the Middle East, Africa, Europe and the Americas repeatedly place reorders with us.
1. Factory-Direct Manufacturing, No Middlemen
We are the galvanized steel coil manufacturer behind the brand. Our own pickling line removes scale from the hot rolled substrate, our cold rolling mill reduces gauge, and our continuous hot-dip galvanizing lines apply the zinc coating. Buying directly from the GI coil factory removes trader markups and shortens the supply chain, which translates into sharper pricing, faster responses and direct technical support from the people who actually make the coil.
2. Full International Standards Compliance
Every galvanized sheet coil wholesale order is produced to the applicable international standard — ASTM A653 for North America, EN 10346 for Europe, JIS G3302 for Asian buyers and GB/T 2518 for the Chinese domestic market. We routinely supply DX51D, SGCC and Q195-Q235 substrate grades, and our quality department archives each heat number and coil number so full traceability is available from substrate to finished coil.
3. Stable Quality with Multi-Step Inspection
Quality control starts before galvanizing: incoming hot rolled coils are tested for chemistry and surface condition, and in-line gauges continuously monitor strip thickness across the full coil width. After galvanizing, coating weight is verified by weight-loss testing at three points across the strip, and spangle, adhesion, surface finish and coil integrity are inspected coil by coil. A final random re-test is carried out before packing, so your galvanized steel coil arrives with consistent coating and clean edges.
4. Flexible Supply for All Project Scales
Whether you need 5 tons of stock-size coil for a quick production run or 500 tons of custom-slit material for a national roofing project, our scheduling system fits your plan. We can mix different thicknesses and coating weights in one container, hold call-off programs for repeat buyers, and reserve buffer stock of our most requested specifications so that urgent orders can be dispatched faster.
Galvanized Steel Coil Product Range
As a full-range galvanized steel coil supplier, we cover the three most widely used coated coil families in the market. Each family is available in coil or sheet form, with optional slitting, cut-to-length, embossing and packing to your specification.
Hot-Dipped Galvanized (GI) Steel Coil
Our flagship product, hot-dipped galvanized steel coil, carries a zinc coating of Z60 to Z275 g/m² applied in a continuous process for excellent corrosion resistance and formability. GI coil is the standard material for roofing sheets, wall panels, purlins, ducts, cable trays, household appliances and automotive parts. We offer regular spangle, minimized spangle and spangle-free finishes, with chromating and oiling options to protect the surface during transit.
Pre-Painted Galvanized Coil (PPGI)
Pre-painted galvanized coil adds a durable color coating over the zinc layer, combining corrosion protection with a decorative finish in one product. We supply PPGI in polyester, silicon-modified polyester (SMP) and PVDF paint systems, in hundreds of RAL colors, and we can match custom colors for large projects. It is widely used for roofing and cladding sheets, sandwich panels, garage doors, refrigerators and industrial furniture.
Galvalume Steel Coil (AZ Coating)
For applications that demand even longer service life, we also supply galvalume steel coil with an aluminium-zinc alloy coating (55% aluminium, 43.5% zinc, 1.5% silicon). Galvalume offers outstanding heat reflection, cut-edge protection and corrosion resistance, making it a preferred choice for roofing in coastal and industrial environments. AZ50 to AZ180 coating weights are available on request.
Galvanized Steel Coil Specifications
The table below summarizes the main parameters we can produce. Please confirm your required gauge, width, zinc coating and standard when requesting a quotation, and our engineers will confirm the closest production configuration.
| Parameter | Available Range |
|---|---|
| Thickness | 0.12 – 4.0 mm |
| Width | 600 – 1250 mm (slitting available) |
| Coil Inner Diameter | 508 mm (610 mm on request) |
| Zinc Coating Weight | Z60 – Z275 g/m² |
| Steel Grade | DX51D, SGCC, Q195-Q235 |
| Standard | ASTM A653, EN 10346, JIS G3302, GB/T 2518 |
| Surface Finish | Regular / minimized / zero spangle, chromated, oiled, skin-passed |
| Coil Weight | 3 – 15 tons per coil |
Reference Weight per Meter (Width 1250 mm)
Theoretical weight in kg per meter of strip, calculated at a density of 7.85 g/cm³. Actual weight may vary slightly depending on zinc coating and rolling tolerance.
| Thickness (mm) | Weight (kg/m) |
|---|---|
| 0.12 | 1.18 |
| 0.25 | 2.45 |
| 0.50 | 4.91 |
| 0.80 | 7.85 |
| 1.00 | 9.81 |
| 1.50 | 14.72 |
| 2.00 | 19.63 |
| 3.00 | 29.44 |
| 4.00 | 39.25 |
Typical Applications of Galvanized Steel Coil
- Roofing and wall cladding sheets, corrugated metal roofing and sandwich panels
- Steel structures: purlins, C/Z channels, cable trays and light gauge framing
- HVAC components: ducts, casings, fins and air handling units
- Household appliances: refrigerators, washing machines, microwave ovens and water heaters
- Automotive components: brackets, guards, fuel tank shields and floor panels
- General fabrication: fencing, gates, silos, grain storage and agricultural equipment
Why Zinc Coating Quality Matters
The zinc layer is the true working part of a galvanized steel coil. A correct, uniform coating weight is what separates a roof that lasts fifteen years from one that corrodes within five. Zinc protects steel sacrificially: when the coating is scratched or cut, the surrounding zinc corrodes first and shields the exposed steel. Coating weight, adhesion and uniformity therefore decide service life, and they are exactly the parameters our quality system controls. At the same time, coating weight directly influences price, so we help buyers match Z60 to Z275 to their real environment — inland dry climate, coastal salt air, or industrial pollution — instead of over-specifying and overpaying. A reputable galvanized steel coil supplier will always tell you which coating weight is economical for your application, and that is exactly the advice our engineers give on every inquiry.
How We Ensure Reliable Export Service
Exporting coated steel is routine for us, not an exception. Our export department coordinates production, inspection, packing and shipping for more than 80 destination countries, and every order follows the same proven workflow.
Export Experience Across 80+ Countries
From Middle East construction sites to Southeast Asian appliance plants and African roofing programs, our coils have proven themselves in hot, humid, coastal and desert climates. Long-standing shipping and freight-forwarding partnerships in Tianjin allow us to secure vessel space even in peak season, and we advise customers on container loading plans to maximize utilization while protecting coil edges.
Professional Export Documentation
Each shipment is accompanied by a complete document set: commercial invoice, packing list, bill of lading, mill test certificate, certificate of origin, and any certificates required by the destination country, such as Form A or GSP certificates, fumigation certificates and third-party inspection reports. Our documentation team has years of experience with customs clearance in demanding markets, which means fewer delays and fewer surprises at your port.
Flexible Payment and Incoterms
We support T/T with 30% deposit and 70% balance before shipment, as well as L/C at sight for qualified buyers. Standard trade terms include FOB Tianjin, CFR and CIF, and DDP can be arranged for key markets. For first-time orders, we are happy to work with your nominated inspection company so that you can verify quality before the cargo leaves China.
Pricing, MOQ & Delivery
- Price: USD 550 – 950 per ton FOB Tianjin, depending on thickness, coating weight, surface finish and quantity.
- MOQ: 5 tons for stock specifications; 20 tons for custom widths, coatings or grades.
- Payment: T/T, 30% deposit and 70% before shipment, or L/C at sight.
- Delivery: 15 – 30 days after confirmation of deposit, depending on specifications and quantity.
- Packing: Horizontal coils with waterproof wrapping, edge protection and steel-framed support, sea-worthy for container or break-bulk shipping.
- Port of Loading: Tianjin Xingang Port, China.
Buyer’s Guide: How to Choose a Reliable Galvanized Steel Coil Supplier
A galvanized steel coil order is often the backbone of a bigger project, so the supplier decision deserves careful evaluation. First, verify that you are dealing with a real galvanized steel coil manufacturer rather than a trader: ask for factory registration, production line photos and mill test certificates that can be checked back to the mill. Second, confirm which standard applies to your market — ASTM A653 and EN 10346 are common for exports, while JIS G3302 covers Japanese specifications — and make sure the coating weight, substrate grade and tolerance class are written into the contract. Third, compare delivered cost, not just unit price: freight, packing, payment terms and lead time all affect your landed cost. Fourth, request a trial order before committing to large volumes, and use a third-party inspection service such as SGS or BV for the first shipment. Finally, check the supplier’s after-sales behavior — a professional galvanized steel coil supplier answers technical questions quickly and stands behind its mill test certificate.
How to Get a Quotation
Getting a precise quotation is simple. Send us your required thickness, width, zinc coating weight, steel grade, surface finish, quantity in tons, and destination port. Our export engineers will confirm availability, recommend the most economical specification for your application, and return a formal quotation with price, packing details, lead time and payment terms within 12–24 hours. For urgent requirements, we can also quote from buffer stock of standard specifications. Contact us through the website form, by email, or via WhatsApp — every inquiry is answered by a real export specialist.
Frequently Asked Questions (FAQ)
Q1: What is the difference between hot-dip galvanized and electro-galvanized steel coil?
Hot-dip galvanized coil is produced by passing the strip through a bath of molten zinc, which deposits a thick zinc layer (Z60–Z275 g/m²) with excellent corrosion resistance and is the standard choice for construction and general industry. Electro-galvanized coil applies zinc by electrolysis, giving a thinner, smoother coating mainly used where paint adhesion and surface appearance matter more than maximum corrosion resistance, such as automotive body panels and electronic enclosures.
Q2: How do I choose the right zinc coating weight (Z60–Z275)?
Coating weight should match the environment. For indoor applications such as ducts and appliances, Z60–Z90 is usually enough. For outdoor roofing and structures in normal inland climates, Z120–Z180 is a common choice. In coastal, industrial or high-humidity areas, Z220–Z275 provides the longest service life. Our engineers can help you balance coating weight against budget, because heavier coatings increase both service life and price.
Q3: Can you supply PPGI in custom colors and patterns?
Yes. Our color coating line supports polyester, SMP and PVDF paint systems in hundreds of RAL colors, plus popular stone-pattern, wood-pattern and embossed finishes. Custom colors are available for large-volume orders, and we will produce sample panels for your approval before mass production.
Q4: What is the minimum order quantity and lead time for galvanized coil?
Our MOQ is 5 tons for stock sizes and 20 tons for custom specifications such as special widths or coating weights. Standard production takes 15–30 days after deposit confirmation; popular stock specifications can often be dispatched within 7–10 days.
Q5: How is galvanized steel coil packed for sea freight?
Coils are packed in the horizontal position on steel frames, with waterproof wrapping, edge protection rings and rust-preventive paper between layers. For container shipment, coils are lashed securely; for break-bulk, wooden crates or steel-framed packing is used. Packing complies with ISPM 15 when wood is involved.
Q6: Do you provide mill test certificates and third-party inspection?
Yes. Every shipment includes a mill test certificate showing chemical composition, mechanical properties, coating weight and dimensions. If your contract requires independent verification, we coordinate inspection by SGS, BV, TÜV or your nominated agency at the factory or at the port before loading.
Contact Sino East Steel Group today – send your specifications for galvanized steel coil and receive a factory-direct quotation, a mill test certificate sample and a delivery schedule within 24 hours. We look forward to supporting your next project with quality GI coil from Tianjin, China.