Galvanized Steel Coil

Galvanized Steel Coil is a continuous, rolled steel product coated with a protective zinc layer through hot-dip or electro-galvanizing processes. This zinc coating provides exceptional resistance to rust, corrosion, and environmental degradation, making it ideal for high-volume manufacturing and industrial applications. Available in varying widths and thicknesses, these coils are lightweight, versatile, and designed for long-term durability in harsh conditions.

 

Key Technical Parameters of Galvanized Steel Coil

Product	Galvanized Steel Coil
Material Grades	ASTM A653 (DX51D, DX52D), JIS G3302 (SGCC), EN10346 (S320GD+Z), GB/T 2518
Thickness	0.12 mm – 6.0 mm (common range: 0.3–3.0 mm)
Width	600–2,000 mm (customizable for slitting or shearing)
Coil Weight	3–25 metric tons (standard), with inner diameters of 508 mm or 610 mm
Zinc Coating	Hot-Dip: 30–275 g/m² (Z10–Z275) Electro-Galvanized: 10–50 g/m²
Surface Finish	Regular spangle, zero spangle, or smooth finish
Mechanical Properties	– Tensile Strength: 270–550 MPa – Yield Strength: 140–500 MPa
Standards	ASTM A653, EN10346, JIS G3302, ISO 3575

 

Common Surface Treatments：

1.Oiled Surface

Purpose: Prevents white rust (zinc oxide) during storage or transportation by creating a temporary protective film.

Applications: General-purpose coils for construction, automotive, and appliances.

Types: Light oil (e.g., DOS oil) or heavy oil coatings.

2.Chromated (Passivation)

Purpose: Forms a chromium oxide layer to improve corrosion resistance and adhesion for subsequent painting.

Process: Hexavalent or trivalent chromium passivation (eco-friendly).

Applications: Automotive parts, electronics, and pre-painted coils.

3.Phosphated

Purpose: Creates a phosphate layer to enhance paint adhesion and corrosion resistance.

Applications: Coils intended for painting, powder coating, or industrial machinery.

4.Painted/Coated

Purpose: Adds color, UV resistance, and additional protection.

Types:

Pre-Painted (PPGI/PPGL): Coated with polyester, PVDF, or silicone-modified paints.

Electro-Coated (E-Coating): Uniform primer layer for complex shapes.

Applications: Roofing, cladding, and decorative panels.

5.Laminated

Purpose: Bonds a polymer film (PVC, PET) to the surface for scratch resistance and aesthetic appeal.

Applications: Interior décor, signage, and appliance surfaces.

6.Anti-Fingerprint (AFP)

Purpose: Applies a thin organic coating to resist fingerprints and smudges.

Applications: Stainless steel-like finishes for elevators, appliances, and consumer electronics.

 

Technical Comparison of Treatments

Treatment	Thickness	Key Benefits	Industry Standards
Oiled	0.5–3 g/m²	Prevents white rust, easy to clean	ASTM A653, JIS G3302
Chromated	0.1–1.0 µm	Enhances paint adhesion, RoHS-compliant	EN10346, ISO 5002
Phosphated	1–5 µm	Improves corrosion resistance	ASTM B201
Pre-Painted	15–25 µm (per side)	UV resistance, customizable colors	ASTM A755, EN10169
Laminated	20–200 µm	Scratch-proof, decorative finishes	ASTM D6864
Anti-Fingerprint	0.5–2 µm	Smudge-free surface, aesthetic retention	Proprietary (e.g., POSCO AFP)

 

Primary Applications of Galvanized Steel Coil

Galvanized Steel Coils are widely used in industries requiring high-volume, corrosion-resistant steel products:

• Construction & Roofing：

Roofing sheets, wall panels, and gutter systems.

Structural components for pre-engineered buildings.

• Automotive Manufacturing：

Body panels, chassis parts, and undercarriage protection.

• Appliances & Electronics：

Washing machine drums, refrigerator housings, and electrical enclosures.

• HVAC & Ductwork：

Air conditioning ducts and ventilation systems.

• Agriculture & Storage：

Grain silos, livestock shelters, and water tanks.

• Renewable Energy：

Solar panel mounts and wind turbine components.

 

Why Choose Galvanized Steel Coil?

Cost Efficiency: Ideal for mass production due to continuous coil form, reducing material waste.

Customization: Easily slit, cut, or formed into sheets, strips, or custom profiles.

Durability: Zinc coating ensures 20–50 years of service in corrosive environments.

Versatility: Compatible with painting, powder coating, or laminating for enhanced aesthetics.

 

Contact us for bulk orders, technical data sheets, or tailored solutions!