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Professional Hot Dip Galvanized Steel Coil Supplier
Hot dip galvanized steel coil is one of the most widely used anti-corrosion steel materials in the construction, industrial, and manufacturing industries. The steel substrate is continuously immersed into molten zinc to form a durable zinc coating layer that protects the steel surface from rust and environmental corrosion.
Compared with ordinary carbon steel, galvanized steel coil offers superior corrosion resistance, excellent outdoor durability, strong coating adhesion, and lower maintenance costs. It is widely used for roofing sheets, wall panels, steel framing systems, HVAC ducts, agricultural equipment, guardrails, home appliances, and automotive parts.
Xi'an Dongmeng Group Co., Ltd is a professional galvanized steel coil manufacturer and exporter in China, supplying ASTM A653 galvanized steel coils, DX51D GI coils, SGCC galvanized steel sheets, G60 galvanized coils, G90 galvanized steel coils, and Z275 galvanized steel products for global industrial projects and steel distributors.
Our galvanized steel coils are available in regular spangle, minimized spangle, and zero spangle surface finishes with custom slitting, cut-to-length, and OEM export services.
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Product Specifications of Hot Dip Galvanized Steel Coil
| Item | Specification |
|---|---|
| Product Name | Hot Dip Galvanized Steel Coil |
| Material | Carbon Steel |
| Steel Grade | SGCC / DX51D / ASTM A653 |
| Thickness | 0.12mm-6.0mm |
| Width | 600mm-1500mm |
| Zinc Coating | Z30-Z275 / G30-G90 |
| Coil ID | 508mm / 610mm |
| Coil Weight | 3-15 Tons |
| Surface Finish | Regular Spangle / Zero Spangle |
| Technology | Hot Dip Galvanizing |
| Processing Service | Slitting / Cutting / Punching |
| Export Standard | ASTM / EN / JIS |
| Packing | Standard Export Seaworthy Packing |
Key Features and Benefits
Exceptional Corrosion Resistance
As mentioned earlier, the zinc coating provides outstanding protection against corrosion. This makes hot dip galvanized steel coil ideal for outdoor applications, such as roofing, fencing, and outdoor structures, where it can withstand harsh environmental conditions for years without significant degradation.
Cost - Effectiveness
Although the initial investment in hot dip galvanized steel coil may seem higher compared to some uncoated steel products, its long - term cost - effectiveness is undeniable. The reduced need for frequent maintenance, repairs, and replacements due to its corrosion resistance results in substantial savings over the product's lifespan.
High Formability
The hot dip galvanized steel coil retains the formability of the base steel. It can be easily bent, punched, cut, and welded, allowing manufacturers to create a wide variety of products with complex shapes. This property makes it suitable for applications in the automotive, appliance, and construction industries, among others.
Versatile Applications
Thanks to its unique properties, hot dip galvanized steel coil finds applications in numerous industries. In the construction industry, it is used for roofing, wall cladding, and structural components. In the automotive industry, it is utilized for manufacturing vehicle bodies, chassis parts, and interior panels. It is also commonly used in the production of household appliances, such as refrigerators, washing machines, and ovens.
Hot dip galvanized steel coils are widely used in multiple industries.
Construction Industry
Roofing Sheets
Wall Panels
Steel Structures
Prefabricated Buildings
HVAC Industry
Ventilation Duct Systems
Air Conditioning Components
Transportation Industry
Highway Guardrails
Automotive Components
Container Manufacturing
Agricultural Industry
Grain Storage Systems
Greenhouses
Agricultural Equipment
Household Appliance Industry
Washing Machines
Refrigerators
Electrical Cabinets
The Manufacturing Process
Preparation of Steel Coil:
The journey of a hot dip galvanized steel coil begins with the selection of high - quality steel coils. These coils are first thoroughly cleaned to remove any impurities, such as oil, rust, or mill scale. This step is crucial as a clean surface ensures better adhesion of the zinc coating.
Acid Pickling:
After cleaning, the steel coil is immersed in an acid bath, usually hydrochloric acid or sulfuric acid. This pickling process further removes any remaining contaminants and creates a chemically reactive surface on the steel, which is essential for the zinc to bond effectively.
Fluxing:
Next, the pickled steel coil is dipped into a flux solution. The flux serves two important purposes. It protects the steel surface from oxidation before it enters the molten zinc bath and also helps in the formation of a smooth and even zinc coating.
Galvanizing Bath:
The heart of the process is the immersion of the prepared steel coil into a molten zinc bath, which is maintained at a temperature typically between 435 °C and 455 °C (815 °F - 850 °F). As the steel coil is submerged, a metallurgical reaction occurs, leading to the formation of a series of zinc - iron alloy layers on the surface. The thickness of the zinc coating can be precisely controlled by adjusting the immersion time and the withdrawal speed of the coil from the bath.
Cooling:
Once the steel coil is withdrawn from the zinc bath, it is allowed to cool. This can be done either by air - cooling or water quenching, depending on the desired properties of the final product. Cooling solidifies the zinc coating and ensures its uniformity.
Finishing:
After cooling, the galvanized steel coil may undergo additional finishing processes such as leveling, tension leveling, or slitting. These processes help in achieving the desired thickness and dimensions for the specific applications.
Inspection and Testing:
Quality control is a vital part of the manufacturing process. Rigorous inspections and tests are carried out to ensure that the coating thickness, adhesion, and overall quality of the hot dip galvanized steel coil meet the required industry standards.
Galvanized Steel Zinc Coating Structure
The hot dip galvanized coating forms multiple protective layers on the steel surface.
Coating Structure
Pure Zinc Layer
Zinc-Iron Alloy Layer
Base Steel Substrate
The zinc coating acts as both a physical barrier and sacrificial protection layer, improving corrosion resistance even if the surface is scratched.
Z100 vs Z180 vs Z275 Galvanized Steel Coil Comparison
| Item | Z100 Galvanized Steel Coil | Z180 Galvanized Steel Coil | Z275 Galvanized Steel Coil |
|---|---|---|---|
| Zinc Coating Weight | 100g/m² | 180g/m² | 275g/m² |
| Approx. Coating Thickness | ~7μm per side | ~13μm per side | ~20μm per side |
| Corrosion Resistance | Standard | Good | Excellent |
| Outdoor Durability | Moderate | High | Very High |
| Service Life | 5-10 Years | 10-20 Years | 20-30 Years |
| Surface Protection | Basic | Enhanced | Heavy Duty |
| Recommended Environment | Indoor / Dry Areas | Urban / Industrial Areas | Coastal / Outdoor Areas |
| Processing Performance | Excellent | Excellent | Good |
| Welding Performance | Excellent | Excellent | Moderate |
| Formability | Excellent | Excellent | Good |
| Common Applications | Home Appliances, Furniture | HVAC, Steel Structure | Roofing, Guardrails, Marine Projects |
| Cost Level | Lower | Medium | Higher |
| Export Demand | Standard | High | Very High |
| Popular Standards | ASTM A653 / EN10346 | ASTM A653 / EN10346 | ASTM A653 / EN10346 |
| Equivalent Coating | G30-G40 | G60 | G90 |
Galvanized Steel Coil vs Galvalume Steel Coil Comparison Table
| Item | Hot Dip Galvanized Steel Coil (GI) | Galvalume Steel Coil (GL) |
|---|---|---|
| Coating Composition | 100% Zinc Coating | 55% Aluminum + 43.4% Zinc + 1.6% Silicon |
| Coating Type | Zinc Coating | Aluminum-Zinc Alloy Coating |
| Production Process | Hot Dip Galvanizing | Hot Dip Al-Zn Coating |
| Corrosion Resistance | Good | Excellent |
| Heat Resistance | Moderate | Superior |
| Heat Reflectivity | Standard | Excellent |
| Outdoor Durability | High | Very High |
| Coastal Environment Performance | Good | Better |
| Scratch Protection | Excellent Sacrificial Protection | Strong Barrier Protection |
| Service Life | 15-30 Years | 25-40 Years |
| Welding Performance | Excellent | Moderate |
| Formability | Excellent | Good |
| Surface Appearance | Matte / Spangle Finish | Smooth Metallic Finish |
| Cost | Lower | Higher |
| Roofing Applications | Standard Roofing | Premium Roofing |
| Typical Coating Standards | G30 / G60 / G90 | AZ50 / AZ55 |
| Common Steel Grades | SGCC / DX51D / ASTM A653 | SGLCC / ASTM A792 |
| Main Applications | Construction / HVAC / Pipe | Roofing / Wall Panels / Solar |
| Maintenance Cost | Moderate | Lower Long-Term Cost |
STANDARD & GRADE
| HOT-DIP GALVANIZED STEEL COILS | ||||
| ASTM A653M-06a | EN10327:2004/10326:2004 | JIS G 3302-2010 | AS-NZS 4534-2006 | |
| Commercial Quality | CS | DX51D+Z | SGCC | G1+Z |
| STRUCTURE STEEL | SS GRADE 230 | S220GD+Z | SGC340 | G250+Z |
| SS GRADE 255 | S250GD+Z | SGC400 | G330+Z | |
| SS GRADE 275 | S280GD+Z | SGC440 | G350+Z | |
| SS GRADE 340 | S320GD+Z | SGC490 | G450+Z | |
| SS GRADE 550 | S350GD+Z | SGC570 | G500+Z | |
| S550GD+Z | G550+Z | |||
How to Choose the Right Galvanized Steel Coil
Choose Zinc Coating Thickness
G30 for indoor use
G60 for standard construction
G90 for outdoor and marine environments
Select Steel Grade
DX51D for forming
SGCC for general applications
S550GD for high-strength structures
Select Surface Finish
Regular Spangle
Minimized Spangle
Zero Spangle
Confirm Coil Size
Common Width: 1000mm / 1219mm / 1250mm
Common Thickness: 0.3mm-2.0mm
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
Inspection & Quality Assurance
All galvanized steel coils are inspected before shipment.
Inspection Items:
Zinc Coating Thickness Inspection
Surface Flatness Inspection
Width & Thickness Tolerance Inspection
Mechanical Property Testing
Salt Spray Corrosion Testing
Coil Weight Verification
Third-party inspection services such as SGS, BV, and TUV are supported.
Product Delivery Standards
ASTM A653
EN 10346
JIS G3302
ISO 9001
SGS Inspection
RoHS Compliance
REACH Compliance
Export Packing of Galvanized Steel Coil
Standard export seaworthy packing protects galvanized steel coils during transportation.
Packing Includes:
Waterproof Kraft Paper
PVC Film Protection
Galvanized Steel Outer Cover
Steel Edge Protection
Wooden Pallets
Steel Strapping Reinforcement
Custom export packaging is available based on destination requirements.
Popular Searches for Galvanized Steel Coil
Hot Dip Galvanized Steel Coil
HDG Steel Coil Supplier
GI Coil Manufacturer
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G90 Galvanized Steel Coil
Z275 Galvanized Coil Supplier
Zero Spangle GI Coil
Galvanized Roofing Steel Coil
FAQ
What is hot dip galvanized steel coil?
Hot dip galvanized steel coil is steel coated with zinc through a continuous hot-dip galvanizing process for corrosion protection.
What is the difference between galvanized steel coil and galvalume steel coil?
Galvanized steel uses pure zinc coating, while galvalume steel uses aluminum-zinc alloy coating with better heat resistance.
Which galvanized coating is best for roofing?
G90 and Z275 galvanized steel coils are commonly recommended for roofing applications due to their excellent corrosion resistance.
What does G90 mean in galvanized steel?
G90 indicates a zinc coating weight of approximately 0.90 oz/ft² for both sides of the steel sheet.
Is galvanized steel coil suitable for outdoor use?
Yes. Galvanized steel coil is widely used in outdoor construction and roofing applications.
Can galvanized steel coil be welded?
Yes. Proper welding procedures and ventilation should be used during welding.
What are the common galvanized steel coil grades?
Common grades include SGCC, DX51D, ASTM A653 CS-B, S350GD, and S550GD.
What is the HS code for galvanized steel coil?
The common HS code for galvanized steel coil is 721049.
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