High Strength Structural PPGI Steel Coil – S350GD Heavy Zinc Grade
Product Overview
High-strength structural pre-painted galvanized steel (PPGI) combines the load-bearing performance of high-strength low-alloy steel with the corrosion protection and decorative performance of heavy galvanized and HDP coating. This S350GD Z275 grade is specially engineered for steel framing systems, industrial building envelopes and structural cladding. It provides a cost-effective alternative to bare structural steel with on-site painting, delivering better coating quality, faster construction and lower total project cost.
Why Choose CNB Structural PPGI?
Our structural PPGI products are produced on dedicated heavy-gauge coating lines with strict control of mechanical properties, coating weight and paint adhesion. We use optimized heating and curing processes to ensure paint performance is not compromised by high-strength steel thermal history. Every batch is certified for mechanical properties and coating quality to meet structural design codes, making it reliable for load-bearing building applications.
Key Specifications
| Item | Specification |
|---|---|
| Product Name | High Strength Structural PPGI Steel Coil |
| Base Substrate | Hot-dip Galvanized Steel (GI), minimized spangle |
| Paint System | High Durability Polyester (HDP) – Topcoat + Primer + Backcoat |
| Paint Film Thickness | Top 18–22μm / Primer 5–7μm / Back 5–7μm |
| Zinc Coating Mass | Z180 – Z275g/m² (double side), Z275 standard |
| Steel Grade | S350GD |
| Thickness Range | 0.8mm – 2.5mm |
| Standard Widths | 1000mm, 1200mm, 1250mm, 1500mm |
| Coil Inner Diameter | 508mm / 610mm |
| Coil Weight | 5MT – 10MT per coil |
| Surface Finish | Semi-gloss / matte |
| Color System | Standard industrial RAL colors, custom available |
| Applicable Standards | ASTM A755, EN 10169, structural steel standards |
| Minimum Yield Strength | ≥350MPa |
Core Advantages
- High structural strength: S350GD grade delivers reliable load-bearing performance for framing and cladding systems.
- Heavy corrosion protection: Z275 heavy zinc coating provides excellent edge and scratch corrosion protection for structural components.
- Cost and time saving: Eliminates on-site painting, reducing construction time and total project cost.
- Consistent coating quality: Factory-controlled coating delivers better and more uniform protection than field painting.
- Good formability: Suitable for roll forming into purlins, girts and structural profiles.
Applications
This structural PPGI coil is widely used for steel building framing, C/Z purlins, wall girts, floor decking, industrial plant cladding, warehouse structures, agricultural buildings and large-span metal building envelopes.
Get a Quotation
We supply structural PPGI in a full range of strength grades (S220GD to S550GD), zinc coatings and paint systems for steel construction projects. Material test certificates and structural design support are available upon request. Contact our construction steel team for a detailed project quotation.
