Corrugated Galvanised Steel Sheet
Corrugated Galvanised Steel Sheet
Product Specifications
| Dimension Name | Value |
| Thickness | 0.3–1.0 mm (standard); customizable up to 1.5 mm |
| Effective Width | 665 / 800 / 890 / 990 mm (common); customizable 600–1500 mm |
| Length | 0.5–12 m (cut to size); coils available on request |
| Chemical Composition (ASTM A653 / A36 / A525) | C ≤ 0.25 %, Mn ≤ 1.50 %, P ≤ 0.035 %, S ≤ 0.035 %, Si ≤ 0.30 %, Al ≤ 0.10 % |
| Chemical Composition (JIS G3302 / JIS G3101) | C ≤ 0.20 %, Mn ≤ 1.20 %, P ≤ 0.030 %, S ≤ 0.030 %, Si ≤ 0.30 % |
| Mechanical Properties | Tensile Strength: 270–450 MPa; Yield Strength ≥ 140 MPa; Elongation ≥ 22 % |
| Zinc Coating Weight | Z30–Z275 g/m² (hot-dip galvanized); Al–Zn AZ30–AZ150 g/m² available |
| Available Grades | ASTM A653, A36, A525; DX51D/DX52D; SGCC/SGCH; Q195/Q235; SS400 |
| Corrugation Profile (Pitch × Depth) | YX18-76, V840 (Pitch: 76 mm, Depth: 18–21 mm); custom profiles optional |
| Surface Treatment | Hot-dip galvanized; Pre-painted (PE, SMP, PVDF); PVC film coating |
| Material Form | Cold-rolled steel; supplied as Sheets, Coils, or Plates |
| Edge Type | Mill edge or Slit edge |
| Tolerance | ±1% (thickness, width, length) |
| HS Code | 7210.30.00 (galvanized sheets); 7210.90 (other coated steel) |
| Packaging | Waterproof kraft paper + plastic film + steel strip + wooden pallet |
| Certifications | ISO9001, ASTM, JIS, CE, ROHS, SABS, SASO, PVOC, SONCAP |
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More Details
- Key Benefits
- Recommended Coatings
- Typical Applications
- Installation Guidelines
- Key Steps in Manufacturing Process
Key Benefits
- Superior Corrosion Resistance: Galvanised zinc coating protects the steel core from rust, even in harsh or wet environments.
- High Strength-to-Weight Ratio: Suitable for structural roofing, especially in high-wind or snow-prone regions.
- Customisable Lengths & Coatings: Choose from up to 12 colours and three coatings, including PVC Plastisol (for maximum lifespan) and Polyester Paint (for colour-rich visual appeal).
- Fast Water Drainage & Structural Integrity: Corrugated profiles allow water to drain efficiently, reducing ponding and leak risks.
- Wide Effective Coverage: Each sheet offers an effective cover of 990mm, reducing the number of panels required per roof.
- Flexible Pitch Compatibility: Can be installed on roof pitches as low as 10 degrees, offering flexibility in design.
Recommended Coatings
- PVC Plastisol Coating: Best for longevity and resistance to scratches and UV damage.
- Polyester Paint Coating: Great for aesthetic variation and longer life than plain galvanised steel.
- Plain Galvanised Finish: Most economical for temporary or purely functional structures.
Typical Applications
Corrugated galvanised steel sheets are commonly used in:
- Agricultural barns and cattle sheds
- Lean-to and canopy covers
- Storage and garden sheds
- Garages and workshops
- Pergolas and greenhouses
- Conservatories and modern residential builds
Installation Guidelines
Overlap: At least two corrugations are recommended for weatherproof performance.
Pitch: Install at a minimum pitch of 10° for effective rainwater drainage.
Key Steps in Manufacturing Process
- Cold-Rolling the Steel Base
High-quality low-carbon steel coils are cold-rolled to the desired thickness (e.g., 0.5 mm or 0.7 mm), enhancing flatness, tensile strength, and surface uniformity.
- Continuous Hot-Dip Galvanising
The steel strip is passed through a bath of molten zinc at controlled temperatures. Our fully automated line guarantees uniform zinc coating adhesion (Z120–Z275g/m²), which resists corrosion and prolongs the sheet’s lifespan.
- Chromate Passivation & Skin Pass
After galvanising, the sheet surface is treated with chromate passivation to improve corrosion resistance and paint adhesion. A light skin-pass rolling gives the sheet a smoother finish and enhances paintability.
- High-Precision Corrugation Profiling
Using advanced roll-forming equipment, the sheet is pressed into a consistent wave pattern (e.g., sinusoidal or trapezoidal). This corrugation dramatically increases sheet rigidity without adding weight.
- Optional Organic Coating Application
For enhanced durability and aesthetics, we apply Polyester Paint or PVC Plastisol coatings in a variety of colours. These coatings are cured in a high-temperature oven to ensure proper bonding and resistance to peeling or fading.
- Custom Cutting and Quality Control
Sheets are cut to the requested lengths (up to 7m) with minimal edge burring. Each batch undergoes a multi-point inspection for coating thickness, adhesion, wave depth, and dimensional accuracy.
