GI Coil

GI coil, galvanized steel coil, a cost-effective, versatile corrosion-resistant metal material, is typically sold in various forms such as hot-dip galvanized steel coils and electrogalvanized steel coils. Currently, Wanzhi Group supplies multiple types of galvanized steel coils—including large zinc flake, small zinc flake, standard zinc spangle, coated, embossed, and painted varieties—to sectors including construction, home appliances, and industry.

Standards: GB/T2518, GB/T25052, EN10346, JIS G3302, ASTM A653
Place of Origin: Shandong, China
MOQ: 10 tons

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GI Coil Factory

GI Coil – Surface

Surface treatment of GI coils not only meets diverse aesthetic requirements but also effectively extends the corrosion resistance lifespan of galvanized steel, preventing rust caused by transportation or storage conditions.

Surface Treatments

  • Chromate Passivation: Standard treatment providing basic rust prevention.
  • Chromate-Free Passivation: Eco-friendly treatment compliant with RoHS directives.
  • Oil Coating: Enhances short-term rust resistance, facilitating storage and transportation.

Zinc spangle Pattern

  • Regular Spangle GI Steel: Distinct zinc spangle crystals naturally formed on the steel surface during zinc layer solidification.
  • Small Zinc Spangle GI Steel: Achieved through controlled processes for a finer, more uniform galvanized surface.
  • Free Zinc Spangle GI Steel: Features a smooth, flat surface, making it the preferred substrate for subsequent coating applications.

GI Coil – Value-Added Processing

Wanzhi Group is a professional coated steel factory supplier. We not only provide GI coil raw materials but also offer one-stop value-added processing services.

Zinc Coated Galvanized Steel Manufacturer

GI Coil – Film Coating

To provide additional protection for GI steel, we can coat the surface of galvanized coils with a peelable plastic protective film or plastic films with other effects (brushed, wood grain, patterned, orange peel, etc.). The coated galvanized steel coil features a smoother, more aesthetically pleasing surface, making it ideal for high-end applications demanding exceptional surface quality, such as appliance panels and decorative sheets.
VCM Home Appliance Board

GI Coil – Embossing

Leather pattern Galvanized Embossed Steel Coil

We offer galvanized coil embossing services, creating three-dimensional textures (e.g., orange peel, diamond patterns) on the surface using precision rollers. Embossing not only enhances aesthetics but also effectively conceals scratches while increasing surface strength and abrasion resistance. Common applications include elevator cabs, furniture, and decorative wall panels.

GI Coil – Slitting

We provide high-precision steel slitting (galvanised steel strip) services, cutting wide coils into multiple narrow strips of specified widths (width accuracy ±0.1mm) according to your requirements. This service prepares material for subsequent processes like roll forming and tube manufacturing, helping you reduce processing steps and improve production efficiency.
Split Strip

GI Coil – Leveling

dx51d Galvanized Steel Sheet

We provide steel leveling (galvanized steel sheet) processing, flattening galvanized steel coils through leveling lines and shearing them into flat sheets of fixed lengths. We supply pre-cut sheets in various dimensions (slitting thickness: 0.15-2.0mm, length: 100-400mm, length accuracy: ±0.5mm), ready for direct use in roll forming, cutting, stamping, or as finished sheet material.

GI Coil – Painting

Galvanized coils serve as an ideal substrate for pre-painted steel sheets (PPGI). We can apply primer and topcoat to the galvanized coil surface according to your requirements, offering multiple coating systems including polyester (PE), silicone-modified polyester (SMP), fluorocarbon (PVDF), PVC, PU, etc., along with printing, patterns, textures, and other effects to meet your diverse needs for color, decoration, durability, and specific functionalities.

Pre-painted Galvanized Cold-rolled Steel Coil

GI Coil – Punching/Shearing

Galvanized Perforated Sheet

We provide high-precision CNC punching and shearing services to transform galvanized coils or sheets into components with specific hole patterns, designs, or shapes. These include louver holes, regularly spaced round or square holes, or intricate decorative patterns. Applications span electrical enclosures, ventilation ducts, filtration equipment, architectural decorative grilles, and acoustic panels.

GI Coil – Light Steel Stud Forming

Our factory houses advanced cold-forming production lines that directly roll-form galvanized coils into precise, high-strength, corrosion-resistant light steel stud products of various specifications. This includes U-shaped and C-shaped studs, as well as more complex custom structural components. Widely used in interior decoration, office building construction, hotel partitions, and numerous other construction projects.
Used for Purlin

GI Coil – Roll Forming

Galvalume Trapezoidal Sheet

We also provide professional galvanized coil roll forming (also known as roll forming) services. Through a series of precision forming rolls, galvanized coils or sheets are continuously cold-formed into GI corrugated or trapezoidal panels with specific cross-sectional shapes. GI corrugated sheet is a popular building material for roofing and wall systems in industrial plants, residential buildings, and commercial structures.

GI Coil Factory

Wanzhi GI Coil Factory is certified under ISO9001, ISO14001, and other standards. Our galvanized products comply with international standards including GB/T2518, GB/T25052, EN10346, JIS G3302, and ASTM A653. We offer a diverse product range and provide OEM/ODM services.

Certificates Wanzhi

Production Line

Our galvanized steel production line is located in Boxing County, Binzhou City, Shandong Province, China, with an annual capacity of 600,000 tons. Our production scope includes galvanized, aluzinc, and zinc-aluminum-magnesium materials, as well as value-added processing such as painting, bending, slitting, leveling, and corrugating. Standard galvanized steel coil models are available from stock with delivery times ranging from 5 to 45 working days.

Packaging

We employ precision export-grade packaging, including vertical/horizontal coil wrapping options. Each coil is wrapped in plastic film, moisture-proof paper, galvanized iron sheet, stretch film, and steel strapping to ensure product integrity during long-distance transport and harsh conditions. (Standard coil weights range from 3-8 tons. Wooden or steel pallets can be used upon request, with customizable packaging weights or Wanzhi LOGO.)

Services

Technical Consultation: Assisting you in selecting the most suitable specifications, grades, and coatings.

Flexible Ordering: Free samples provided, supporting small trial orders and large-scale procurement.

Rapid Delivery: Stocked standard specifications with short production cycles.

Quality Assurance: Third-party quality inspection support available (e.g., SGS, BV, TUV).

Case

Our GI coils are exported to over 100 countries and regions worldwide for applications including building structures, electrical manufacturing, cable trays, and agricultural greenhouses. We continuously receive feedback from customers across diverse industries.

GI Coil – Buying Guide

Application Scenario Recommended Zinc Coating (g/m²) Recommended Substrate Thickness Surface Treatment Recommendation
Indoor Dry / Home Appliance Interior Z40 – Z90 0.3 – 1.2mm Oil coating or Chromate passivation
General Building Roofs/Walls Z90 – Z150 0.4 – 1.5mm Chromate passivation
Industrial Environment/Structural Components Z150 – Z275 1.0 – 3.0mm Chromate passivation
Coastal / High Corrosion Areas Z200 – Z275+ ≥1.2mm Non-chromate passivation
Subsequent Coating (Pre-coated Substrates) Z90 – Z180 Varies by application No zinc flowers + non-chromate passivation

GI Coil and GL Coil

Characteristic GI Coil (Galvanized Steel Coil) GL Coil (Galvalume Steel Coil)
Coating Composition 99% Zinc 55% Aluminum, 43.4% Zinc, 1.6% Silicon
Corrosion Resistance Excellent Outstanding, 2-6 times better than GI
Heat Resistance Poor, continuous use temperature ≤160℃ Excellent, can withstand continuous temperatures ≤315℃
Thermal Reflectivity Average High, helps with building insulation and energy savings
Appearance Silver-gray, with zinc flowers Bright silver-white, with fish-scale pattern
Protection Mechanism Sacrificial protection Barrier protection + sacrificial protection
Workability Excellent Good
Cost Economical Relatively higher

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