Product Description
The Galvanized Steel Coil Plate with Z40 coating (40g/m² zinc per side) is a prime-quality building material designed for structural and non-structural applications requiring moderate corrosion protection. Manufactured through hot-dip galvanization, the steel substrate (mild steel or high-strength low-alloy steel) is coated with a zinc layer that bonds metallurgically, forming a protective barrier against rust. With a thickness range of 0.3-3.0mm and widths up to 1500mm, this coil plate offers excellent weldability, formability, and paintability. The Z40 coating is ideal for inland environments with low to moderate humidity, providing a cost-effective solution for non-critical structural components.
Features
Balanced Corrosion Protection: The 40g/m² zinc coating (total 80g/m²) offers 5-10 years of protection in rural environments, making it suitable for applications where extreme coastal or industrial corrosion is not a concern.
High Mechanical Performance: Yield strength ranges from 235MPa (standard) to 550MPa (high-strength grades), supporting load-bearing structures like purlins, girders, and roof trusses.
Easy Fabrication: Good ductility and bendability allow for cutting, punching, and roll-forming into various profiles without coating spalling, especially when proper edge treatment is applied.
Paintable Surface: The galvanized layer can be primed and topcoated for enhanced aesthetics and protection in more aggressive environments, expanding application versatility.
Economic Solution: Lower zinc coating weight reduces material cost while maintaining adequate protection for non-critical construction elements.
Application
Structural Components: Used for purlins, girts, and secondary framing in steel buildings, providing cost-effective support with moderate corrosion resistance.
Roofing & Cladding: Suitable for corrugated roof sheets and wall panels in rural or suburban areas, often painted for color customization.
Fencing & Guardrails: Manufactures chain-link fences, guardrails, and scaffolding components requiring durability and ease of installation.
General Fabrication: Ideal for metal furniture, storage racks, and agricultural equipment in non-coastal regions.
FAQ
Q: What does "Z40" mean?
A: It indicates 40g/m² of zinc coating per side (total 80g/m²), specifying the coating weight for moderate corrosion environments.
Q: Can Z40 galvanized steel be used in coastal areas?
A: Not recommended for direct coastal exposure; higher coatings (Z60-Z275) are better suited. Z40 is ideal for inland use.
Q: How should I paint galvanized steel?
A: Pre-treat with a zinc-rich primer to ensure adhesion, as the smooth galvanized surface may require abrasion or chemical etching first.
Q: What is the difference between hot-dip and electro-galvanized?
A: Hot-dip (Z40) forms a thicker, metallurgical bond with rough texture, while electro-galvanized has thinner coatings (10-20g/m²) and smoother surface.
Q: Does galvanized steel rust when cut?
A: Cut edges are vulnerable; apply touch-up zinc paint or use edge-sealing compounds to prevent rust initiation.
