GI Steel Coil Regular Spangle Zero Spangle 0.12mm to 2.5mm(Z40 – Z275)
Galvanized Steel Coils, commonly known as GI Coils, are one of the most versatile and widely used industrial materials worldwide. They are manufactured by passing cold-rolled steel through a molten zinc bath in a process called Hot-Dip Galvanizing.
The primary purpose of this process is to provide the steel with a protective zinc coating. This coating serves as both a physical and chemical barrier; even if the surface is scratched, the zinc sacrificially protects the underlying steel from oxidation and rust. This unique characteristic makes GI coils essential for applications requiring durability and resistance to harsh environmental conditions.
- Superior Corrosion Resistance: The zinc layer provides long-term protection against moisture and atmospheric oxygen
- Cost-Effectiveness: Offers a highly durable solution at a significantly lower price point compared to stainless steel
- Excellent Formability: Maintains mechanical properties that allow bending, stamping, and rolling without coating peel-off
- Low Maintenance: Inherent protective qualities ensure minimal upkeep throughout the product lifespan
Below are standard parameters for high-quality GI coils. Specific dimensions and grades can be customized to meet project requirements.
| Parameter | Specification Details |
|---|---|
| Standard | ASTM A653, JIS G3302, EN 10346, AS 1397 |
| Steel Grade | DX51D, DX52D, SGCC, CS Type A/B/C, S250GD - S550GD |
| Thickness | 0.12 mm - 4.0 mm |
| Width | 600 mm - 1500 mm (Standard: 914mm, 1219mm, 1250mm) |
| Zinc Coating | 30g/m² - 275g/m² (Z30 - Z275) |
| Surface Finish | Regular Spangle, Minimized Spangle, Zero Spangle |
| Surface Treatment | Chromated (Passivated), Oiled, Skin-passed |
| Inner Diameter | 508 mm / 610 mm |
| Coil Weight | 3 - 8 Metric Tons (Customizable) |
The versatility of GI steel makes it essential across multiple industries:
This sector is the largest consumer of GI coils. Applications include roofing sheets, wall panels, structural purlins, floor decks, and ventilation ducts (HVAC).
Used for manufacturing body parts, internal reinforcements, and components requiring high corrosion resistance to withstand road salt and moisture.
The "white goods" industry utilizes GI steel for outer shells and internal frameworks of washing machines, refrigerators, and air conditioning units.
Mounting structures and frames for solar panels often employ heavy zinc coating (Z275+) GI steel to ensure 20+ year lifespans in outdoor environments.
When molten zinc cools on the steel surface, it forms a crystalline pattern known as spangles. Depending on the cooling process, you can select:
- Regular Spangle: The traditional "flower" pattern
- Zero Spangle: A smooth, matte finish ideal for high-end painting applications
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.