Galvanized Steel Sheets
Zinc Coating: G30-G90
Engineered for maximum durability, our hot-dipped galvanized sheets provide sacrificial zinc protection for HVAC, construction, and appliance manufacturing.
Zinc Coating & Technical Standards
We provide a wide range of coating designations complying with ASTM A653 and JIS G3302 standards, ensuring optimal corrosion protection for various environmental conditions.
| Coating Designation (US/Standard) | Metric Designation (Z-Metric) | Min. Total Weight (Both Sides) | Recommended Application |
|---|---|---|---|
| G30 | Z90 | 90 g/m² | Indoor appliances, dry storage environments. |
| G40 | Z120 | 120 g/m² | Mild outdoor exposure, basic ductwork. |
| G60 | Z180 | 180 g/m² | Standard HVAC, roofing, and general construction. |
| G90 | Z275 | 275 g/m² | Heavy industrial use, coastal & high-humidity areas. |
| G115 | Z350 | 350 g/m² | Agricultural silos and extreme corrosive environments. |
Diagram: Cross-section of Hot-Dipped Galvanized Layers
Why Choose Hot-Dipped Galvanized (HDG)?
The hot-dipping process involves immersing the steel in a 450°C molten zinc bath, creating a metallurgical bond between the zinc and the steel base.
- Sacrificial Anode: The zinc layer corrodes preferentially to protect the base steel, even if the coating is scratched.
- Complete Coverage: Liquid zinc ensures all edges, holes, and corners are uniformly protected.
- Long-Term ROI: G90 coating typically provides over 50 years of maintenance-free service in common atmospheric conditions.
Spangle Options & Surface Quality
From visible crystal patterns to perfectly smooth surfaces, we offer various spangle types to meet your post-processing requirements.
Regular Spangle
The classic "snowflake" crystalline pattern visible to the naked eye. Best for general industrial use where aesthetic painting is not required.
Big Spangle
Features large, well-defined zinc crystals. Often used for decorative HVAC ducts or roofing where the metallic pattern is part of the design.
Zero / Mini Spangle
A smooth, uniform surface without visible grains. Essential for high-end appliances and automotive parts that require powder coating or high-gloss paint.
Post-Galvanizing Treatments
To ensure your galvanized sheets arrive in pristine condition and offer the best performance, we provide several chemical surface treatments:
- Chromated (Passivated): Prevents white rust during transit.
- Oiled: Reduces friction for deep-drawing processes.
- Skin-Passed: Ensures ultimate surface flatness.
- Unoiled/Dry: Ideal for immediate welding or painting.
The Metallurgy of Durability
Sacrificial Anode Protection
Unlike organic coatings, galvanized zinc provides active protection. In the event of surface damage, the zinc layer sacrifices itself to protect the underlying steel through cathodic protection.
Metallurgical Bond Integrity
The Hot-Dip process creates a series of zinc-iron alloy layers that are physically integrated with the steel substrate, ensuring the coating won't delaminate under mechanical stress.
Zero-Maintenance Lifecycle
With a G90 coating, the material is engineered to withstand atmospheric corrosion for over 50 years in rural environments and 20-25 years in heavy industrial areas.
Material Performance Index
Global Industrial Applications
From infrastructure to consumer goods, galvanized steel is the backbone of durable manufacturing.
Roofing & Decking
High-strength corrugated sheets providing long-term structural integrity and weather resistance for industrial warehouses.
HVAC Systems
The standard for air handling units and ductwork, offering internal corrosion resistance against humidity and condensation.
Body Panels
Zinc-coated panels provide critical rust protection for vehicle underbodies, frames, and internal structural components.
Silos & Fencing
Designed to withstand ammonia-rich environments and extreme outdoor moisture in livestock housing and grain storage.
🔍 Expert Advice: G60 vs. G90 Coating
Choosing the correct coating weight is critical for balancing cost and performance. Here is our engineering recommendation based on atmospheric exposure:
- G60 (Z180): Best for indoor appliances, standard HVAC ducting, and light-duty construction where humidity is controlled.
- G90 (Z275): The industry standard for outdoor exposure, roofing, and structural decking. Provides nearly 50% more zinc for superior rust prevention.
- Environment Check: For coastal regions (within 5 miles of the ocean), we strongly advise upgrading to G115 or considering Stainless Steel.
Visualization: Coating Mass Comparison (G60 vs G90)