G350/G550 Aluzinc Coated Galvalume Steel Coil for Building Materials

Overview

The G350/G550 Aluzinc Coated Galvalume Steel Coil is a versatile building material designed to meet the diverse needs of modern construction, offering a range of mechanical strengths and corrosion protections. Available in G350 (yield strength ≥350 MPa) and G550 (yield strength ≥550 MPa) grades, this coil features an aluminum-zinc alloy coating (AZ40g, AZ90g, AZ150g) that balances cost-efficiency with durability for applications ranging from lightweight cladding to heavy-duty structural components.

Manufactured to international standards (ASTM A924, EN 10143), the coil provides a customizable solution for architects, contractors, and manufacturers, with thicknesses from 0.2mm to 2.0mm and widths up to 1500mm. The Aluzinc coating—55% aluminum, 43.4% zinc, 1.6% silicon—delivers superior weather resistance compared to pure zinc, while the choice of steel grade allows optimization for specific load requirements.

Features

Grades for Every Load Requirement:

G350: Ideal for non-load-bearing cladding, roofing, and general fabrication (e.g., wall panels, gutters).

G550: Designed for load-bearing structures like roof trusses, steel beams, and heavy machinery supports, reducing material thickness by 20% compared to lower-strength grades.

Customizable Corrosion Protection:

AZ40g: Suitable for indoor/dry environments (e.g., office partitions, storage racks), offering basic rust protection at a budget price.

AZ90g: Balances cost and performance for urban/suburban outdoor use (e.g., residential roofing, commercial cladding).

AZ150g: For severe environments (coastal, industrial), with salt spray resistance exceeding 2,000 hours and a predicted lifespan of 40+ years with proper maintenance.

Formability & Process Compatibility:

G350 grade: Excellent ductility (elongation ≥22%) for roll-forming into complex profiles (e.g., trapezoidal roofing sheets).

G550 grade: High tensile strength (≥590 MPa) for structural stamping, compatible with automated welding robots for precision fabrication.

Sustainable & Compliant:

Low Carbon Footprint: Aluzinc production uses 30% less energy than stainless steel, with 95% of manufacturing waste recycled.

Global Approvals: Meets ISO 14001 environmental standards and regional building codes (e.g., IBC in the US, GB/T 14978 in China).

Application

Lightweight Construction: G350 with AZ90g coating forms cost-effective roofing and cladding for prefab homes, temporary shelters, and agricultural buildings.

Heavy-Duty Infrastructure: G550 with AZ150g coating is used in bridge components, offshore platforms, and industrial steel frames, enduring harsh marine and chemical environments.

Architectural Design: Available in pre-painted finishes (200+ colors), ideal for creating iconic building facades with G350 grade and spangle-free surface for seamless color application.

Agricultural & Industrial: Protects barns, silos, and factory roofs from moisture, fertilizer, and airborne pollutants with AZ150g coating, minimizing maintenance in corrosive settings.

FAQ

Q: How do I select the right grade and coating combination?

A: Use G350 for non-structural roles, G550 for load-bearing; choose AZ40g for indoor, AZ90g for urban, AZ150g for coastal/industrial. Our team provides free technical consultations for complex projects.

Q: Can G550 coil be bent into curved shapes?

A: Yes, but minimum bend radius increases with strength: G350 (2x thickness), G550 (3x thickness). Pre-heating (100-150°C) improves formability for extreme curves.

Q: Is AZ90g suitable for green roofs with soil and plants?

A: Yes, but apply a waterproof underlayment to protect the coating from root penetration and organic acids; AZ90g provides adequate corrosion resistance for vegetative roofing systems.

Q: What is the typical lead time for custom-coated coils?

A: Standard orders (RAL colors, AZ90g/G350) ship in 15 days; custom grades/coatings require 30-45 days, including material testing and quality certification.