Zn-Al-Mg Alloy Coated Ultra-Corrosion Resistant Construction Steel Coil – Harsh Environment Grade
Product Overview
Zinc-Aluminum-Magnesium (Zn-Al-Mg) alloy coated steel is the next-generation corrosion-resistant building material designed for harsh coastal, industrial and agricultural environments. The ternary alloy coating delivers unique self-healing cut-edge corrosion protection, outperforming both standard galvanized and galvalume steel in long-term atmospheric exposure. This grade is ideal for building envelopes in high-corrosion regions, providing extended service life and reduced maintenance cost.
Why Choose CNB Al-Zn-Mg Construction Steel?
We supply advanced Zn-Al-Mg alloy coated steel from leading Chinese mills with patented alloy composition and coating technology. Every coil undergoes strict corrosion testing including salt spray and cut-edge corrosion verification to guarantee performance in harsh environments. We offer both bare alloy and pre-painted versions, with various coating weights and strength grades to match specific project requirements.
Key Specifications
| Item | Specification |
|---|---|
| Product Name | Zn-Al-Mg Alloy Coated Construction Steel Coil |
| Base Steel Grade | S250GD / S350GD structural grade |
| Coating System | Zn-Al-Mg ternary alloy |
| Coating Mass | ZM100 – ZM200g/m² (double side) |
| Base Steel Thickness | 0.4mm – 2.0mm |
| Standard Coil Widths | 1000mm, 1220mm, 1250mm |
| Coil Inner Diameter | 508mm / 610mm |
| Key Feature | Self-healing cut-edge corrosion protection |
| Corrosion Performance | 2–3x vs standard hot-dip galvanized |
| Applicable Standards | ISO 17961, EN 10346 |
| Expected Service Life | 20–25 years (coastal/industrial) |
Core Advantages
- Self-healing corrosion: Automatic cut-edge and scratch protection via magnesium passivation.
- Superior durability: 2–3x longer service life than standard galvanized steel.
- Harsh environment proven: Excellent for coastal, industrial and agricultural corrosion.
- Paint compatible: Excellent adhesion for subsequent color coating systems.
- Sustainable performance: Lower coating thickness for equal or better corrosion protection.
Applications
This Al-Zn-Mg construction steel is widely used for coastal building roofing, industrial plant cladding, agricultural barns, waste treatment facilities, salt storage buildings, renewable energy structures and high-corrosion building envelopes.
Get a Quotation
We supply Zn-Al-Mg alloy coated steel in coil, sheet and profiled forms for harsh environment construction projects. Corrosion test reports and project-specific material recommendations are available upon request. Contact our advanced construction materials team for a detailed quotation.
