Hot Dipped Galvanized Steel Coil - GI Coil Manufacturer & OEM/ODM Supplier

Product Overview

 

Professional manufacturer of hot dipped galvanized steel coils (GI coils) with strong OEM and ODM capabilities. The galvanized steel coils are produced from high-quality cold rolled substrate through advanced continuous hot-dip galvanizing lines, delivering superior corrosion resistance, excellent formability and consistent mechanical properties.

With flexible customization options covering thickness, width, zinc coating weight, steel grade and packaging, our GI coils are designed to meet diverse application requirements across construction, automotive, roll forming and general fabrication industries. Every coil undergoes rigorous quality control and comprehensive testing to ensure consistent performance and reliable quality across all batches.

Available Specifications & Customization Options

Thickness Range: Wide range available from ultra-thin to standard gauges, customizable to customer requirements with precise thickness control and tight tolerances

 

Width Range: Multiple width options available to suit different applications and processing requirements

Steel Grades: Commercial quality, drawing quality, deep drawing quality and structural quality grades available to match application requirements

Zinc Coating: Various zinc coating weights available from standard to heavy-duty options to meet different corrosion protection requirements

Coil Weight: Flexible coil weights to suit handling, processing and transportation requirements

Coil Inner Diameter: Standard ID options available

Surface Treatment: Various surface treatment options available including passivation, oiling, passivation plus oiling, and chromate-free passivation

Surface Finish: Zero spangle, minimized spangle, regular spangle and smooth finishes available

 

Product Features & Advantages

Superior Corrosion Resistance: Hot-dipped galvanized coating provides reliable protection against corrosion, significantly extending product service life in various environments.

 

Excellent Formability: Precision manufacturing ensures excellent flatness and formability, making our coils suitable for roll-forming, bending, profiling, stamping and deep drawing operations without surface damage.

 

Precise Dimensional Tolerances: Advanced rolling and process control ensures precise thickness and width tolerances meeting international standards, delivering consistent material for precision applications.

 

Consistent Mechanical Properties: Strict process control ensures consistent tensile strength, yield strength and elongation across all coils, providing reliable performance in downstream processing.

 

Flexible Customization: Full OEM/ODM capabilities with customizable thickness, width, zinc coating, steel grade and packaging to meet your specific application requirements.

 

High Surface Quality: Clean, uniform galvanized surface free from defects, ready for direct use or further processing including painting and forming.

 

Multiple Surface Finishes: Various spangle and surface finish options available to suit aesthetic and functional requirements.

 

Material Composition & Chemical Properties

 

Our hot dipped galvanized steel coils are manufactured using high-quality steel with controlled chemical composition to ensure consistent material properties and excellent galvanizing performance.

 

Chemical Composition Control:

- Carbon (C): Controlled to ensure good formability and weldability

- Manganese (Mn): Controlled for strength and hardenability

- Phosphorus (P): Controlled to maintain ductility

- Silicon (Si): Controlled for galvanizing reaction and coating quality

- Sulfur (S): Controlled for cleanliness and formability

 

All chemical elements are strictly controlled within specified ranges to ensure consistent material performance and compliance with international standards.

 

Mechanical Properties & Performance

 

Our galvanized steel coils deliver reliable mechanical properties to suit various forming and fabrication applications:

 

Yield Strength (Yp): Consistent yield strength providing predictable forming performance

Tensile Strength (Ts): Reliable tensile strength for structural applications

Elongation (El): Good elongation ensuring formability for bending and profiling operations

Hardness: Controlled hardness for consistent processing performance

Impact Resistance: Good impact resistance meeting application requirements

 

Mechanical properties are verified through comprehensive testing to ensure compliance with customer specifications and international standards.

 

Zinc Coating & Surface Quality

 

Zinc Coating:

- Uniform zinc coating across entire coil surface

- Various coating weights available to match corrosion protection requirements

- Strong adhesion between zinc coating and steel substrate

- Consistent coating thickness with strict control

 

Surface Quality:

- Clean, uniform galvanized surface free from defects

- Various spangle patterns available to suit aesthetic requirements

- Smooth surface for painting and further processing

- No visible coating defects, pinholes or surface irregularities

 

Surface Treatment Options:

- Passivation - Chromate or chromate-free passivation for enhanced corrosion protection

- Oiling - Light oil coating for temporary rust protection during storage and handling

- Passivation + Oiling - Combined treatment for maximum protection

- Zero spangle - Smooth, uniform surface ideal for painting and aesthetic applications

- Minimized spangle - Fine spangle pattern for balanced appearance and performance

- Regular spangle - Standard galvanized appearance

 

Applications & End-Use Scenarios

 

Building & Construction

- Roofing sheets and roofing systems

- Wall cladding and facade panels

- Structural framing and light gauge steel

- Garage doors and roller shutters

- Window frames and door profiles

- Decking and flooring systems

- Building components and accessories

 

Roll Forming Industry

- Section steel and profiles

- Purlins and girts

- Structural components

- Fencing and railing systems

 

Automotive Industry

- Automotive body panels and structural components

- Interior parts and seat frames

- Chassis components

- Exhaust system parts

 

Home Appliance Industry

- Refrigerator back panels and inner liners

- Washing machine components

- Air conditioner parts

- Water heater shells

- Oven and microwave components

 

Agricultural Applications

- Agricultural buildings and storage

- Livestock housing and shelters

- Grain storage and handling equipment

 

General Fabrication

- Metal stamping and deep drawing

- Pipe and tube manufacturing

- Industrial shelving and racking

- Electrical enclosures and cabinets

- HVAC components and ducting

- Storage systems and containers

 

Packaging & Delivery Information

 

Packaging: Standard export seaworthy packaging with moisture-proof paper, anti-rust protection, edge protectors and heavy-duty steel strapping. Winding is even and uniform to prevent damage during transit. Packaging designed to protect goods during delivery, loading and unloading.

 

Container Loading: Optimized loading arrangements to maximize container utilization and ensure safe transport.

 

Delivery Time: Flexible production scheduling to meet customer requirements. Standard lead times applicable with expedited options available for urgent orders.

 

Shipping Port: Qingdao Port, China (closest major port to our manufacturing facility)

 

Quality Assurance & Standards Compliance

 

Our hot dipped galvanized steel coils are manufactured in compliance with internationally recognized standards including EN 10346, JIS G3302, ASTM A653 and equivalent specifications. We implement comprehensive quality control throughout the entire production process:

 

1. Raw material inspection with mill certificate verification for chemical composition

2. In-process monitoring with continuous thickness and surface inspection

3. Zinc coating weight measurement with precise control

4. Mechanical property testing including tensile, yield and elongation verification

5. Surface quality inspection - visual and instrumental control

6. Dimensional verification - precise thickness and width tolerance checks

7. Impact testing for structural applications

8. Hardness testing for processing performance

9. Packaging inspection ensuring proper protection for shipment

 

OEM/ODM Capabilities

 

As an experienced manufacturer with comprehensive production capabilities, we offer complete OEM and ODM services:

 

- Custom steel grades based on customer requirements

- Custom thickness and width specifications

- Custom zinc coating weights

- Private labeling and branding options

- Custom packaging solutions

- Surface treatment options including zero spangle, minimized spangle and custom finishes

- Flexible order quantities from trial orders to bulk shipments

- Technical support throughout product development

- Custom mechanical properties to suit specific applications

 

Strong OEM/ODM Capabilities: Full customization services from product specification to packaging, working closely with customers to develop the right solution.

 

Wide Product Range: Comprehensive range of thicknesses, widths, steel grades and zinc coating weights to meet diverse application requirements.

 

Quality Commitment: Rigorous quality control and comprehensive testing procedures ensure consistent product quality and reliable performance.

 

Factory Direct Pricing: Integrated manufacturing eliminates middleman costs, offering competitive factory-direct pricing.