SGCC Z180 Galvanized Steel Coil for HVAC Ducts & Steel Structures
Product Details
| Item: | SGCC Galvanized Steel Coils | Zinc Layer: | Z180 |
|---|---|---|---|
| Surface: | Regular Spangle, Zero Spangle Or As Required | Thickness: | 0.3mm~4.0mm |
| Edge: | Mill Edge Slit Edge | Material: | Cold Rolled Carbon Steel Base |
| Grade: | DX51D, DX52D, DX5D, SGCC, G550 | Surface Treatment: | Chromated Or Anti-fingerprint |
Product Description
SGCC galvanized steel coil is a high-performance coated steel product manufactured through a continuous hot-dip galvanizing process. By coating the steel surface with a protective zinc layer, the material achieves excellent corrosion resistance, improved durability, and stable processing performance.
This galvanized steel coil is available in various zinc coating weights including Z80, Z120, Z180, and Z275, making it suitable for both indoor and outdoor applications. The zero spangle surface finish provides a cleaner appearance and better paint adhesion, especially for applications requiring secondary coating or decorative use.
Compared with ordinary steel sheets, galvanized coils offer longer service life, lower maintenance cost, and better resistance against humidity, oxidation, and industrial pollution. It is widely used in roofing systems, HVAC ducts, steel structure fabrication, household appliances, and transportation industries.
In construction and industrial environments, ordinary carbon steel is highly vulnerable to corrosion due to exposure to:
- Rainwater and humidity
- Industrial gases and chemicals
- Temperature fluctuations
- Outdoor UV exposure
Without proper surface protection, steel materials may quickly develop:
- Rust and white corrosion
- Surface damage
- Structural weakening
- Higher maintenance costs
- Reduced product lifespan
For roofing systems, ventilation equipment, and structural fabrication, corrosion protection is essential to ensure long-term performance and safety.
Hot dipped galvanized steel coil provides an economical and effective anti-corrosion solution by applying a zinc coating onto the steel substrate.
The galvanized coating protects steel through two mechanisms:
The zinc layer isolates steel from moisture and oxygen.
Zinc reacts first when exposed to corrosion, protecting the steel underneath even if scratches occur.
For different industries and processing methods, galvanized steel can be supplied in different substrate grades:
- DX51D+Z / SGCC → Standard forming applications
- DX53D+Z → Deep drawing and stamping applications
Higher zinc coatings such as Z180 and Z275 are recommended for roofing and humid outdoor environments.
| Item | Specification |
|---|---|
| Product Name | Hot Dipped Galvanized Steel Coil |
| Grade | SGCC / DX51D+Z / DX53D+Z |
| Standard | JIS G3302 / EN 10346 / ASTM A653 |
| Thickness | 0.3 – 4.0 mm |
| Width | 900 – 1500 mm |
| Zinc Coating | Z80 – Z275 |
| Surface | Zero Spangle / Regular Spangle |
| Surface Treatment | Oiled / Chromated / Passivated |
| Coil Weight | 3 – 10 Tons |
| Coil ID | 508 mm / 610 mm |
| Base Material | Cold Rolled Steel / Hot Rolled Steel |
Galvanized steel coil is suitable for a wide range of industrial and commercial applications.
- Corrugated roofing sheets
- Sandwich panels
- Steel structure roofing
- Air ducts
- Ventilation pipelines
- Exhaust systems
- Refrigerator back panels
- Washing machine shells
- Air conditioner housings
- Cable trays
- Storage cabinets
- Electrical enclosures
- Guardrails
- Vehicle structural parts
The galvanizing process begins with cleaning and preparing the steel substrate.
The steel is then immersed into molten zinc, where metallurgical reactions form multiple protective layers:
- Zinc-iron alloy layer
- Intermediate protection layer
- Pure zinc outer layer
These layers create strong adhesion and corrosion resistance.
The zinc coating delays oxidation and extends service life.
Even when the surface is damaged, surrounding zinc continues protecting exposed steel.
This makes galvanized steel ideal for outdoor and industrial environments where ordinary steel would corrode rapidly.
Selecting the right galvanized steel coil depends on environment, processing requirements, and end-use applications.
| Requirement | Recommended Option |
|---|---|
| General Construction | DX51D + Z120 |
| Roofing Sheets | Z180 / Z275 |
| Humid & Coastal Areas | Z275 |
| Deep Drawing Components | DX53D+Z |
| Decorative Surface | Zero Spangle |
| Appliance Use | Anti-fingerprint GI |
- Z80–Z120 → Indoor and dry environments
- Z180 → Roofing and outdoor use
- Z275 → Coastal and industrial areas
- Regular spangle → Standard industrial use
- Zero spangle → Painting and decorative applications
- DX51D → General forming
- DX53D → Better ductility and stamping performance
SGCC is a common galvanized steel grade under JIS G3302 standard, widely used for construction and industrial applications.
Zero spangle galvanized steel provides a smoother surface and better appearance, making it suitable for painting and appliance manufacturing.
Z180 and Z275 are commonly recommended for roofing due to their stronger corrosion resistance.
DX53D has lower carbon content and better elongation, making it more suitable for deep drawing and complex forming.
Yes. Galvanized steel is specifically designed for outdoor and humid environments because of its anti-corrosion zinc coating.
Product Highlights
SGCC Z180 Galvanized Steel Coil for HVAC Ducts & Steel Structures Product Overview SGCC galvanized steel coil is a high-performance coated steel product manufactured through a continuous hot-dip galvanizing process. By coating the steel surface with a protective zinc layer, the material achieves ...
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