Galvalume Coil

Description

1. Product Overview
Galvalume Coil is a high-performance, hot-dip metallic-coated steel product composed of aluminum (55%), zinc (43.5%), and silicon (1.5%), offering the corrosion resistance of aluminum combined with the sacrificial edge protection of zinc. It is primarily used in premium building envelope systems, industrial roofing, and automotive components where long-term atmospheric exposure demands exceptional durability. With a service life up to four times longer than standard galvanized steel in most environments, Galvalume Coil represents the strategic choice for asset owners seeking lower lifetime maintenance costs and superior total cost of ownership (TCO).

2. Key Specifications & Technical Characteristics

• Chemical composition (coating): Al 55% – Zn 43.4% – Si 1.5% (by weight)

• Substrate grade: DX51D, S350GD, S550GD (ASTM A792 / EN 10346 compliant)

• Coating weight range: AZ50 – AZ185 (g/m² double-side, nominal)

• Surface finish: Spangle-free, smooth with optimized passivation (Cr⁶⁺-free option available)

• Coil dimensions: 0.12 mm – 1.5 mm thickness; 600 mm – 1,250 mm width

• Coil ID: 508 mm / 610 mm (±5 mm)

• Coil weight: 3 – 15 MT standard (customizable up to 20 MT)

• Packaging: Anti-rust VCI paper + moisture-proof film + galvanized steel skid + steel strapping (export-ready)

• Shelf life: 6 months indoors; 12 months with factory-applied protective oil / storage film

3. Core Industrial Applications

• Construction & roofing: Standing seam roofs, wall cladding, prefabricated warehouses, agricultural buildings – outperforms galvanized steel in salt spray, industrial pollution, and high-humidity zones by reducing red rust propagation.

• HVAC & ductwork: Industrial air handling units, chimney liners, and exhaust ducts – Galvalume’s high reflectivity reduces solar heat gain, lowering cooling loads by 15–25% compared to bare steel or painted galvanized.

• Automotive & transportation: Exhaust system heat shields, underbody panels, and bus structural parts – superior heat oxidation resistance up to 315°C continuous (versus 230°C for galvanized), eliminating early coating failure near hot components.

• Appliance & general manufacturing: Oven liners, industrial silos, and fuel tank housings – the aluminum-rich layer prevents micro-crevice corrosion that typically undermines painted galvanized edges.

4. Competitive Advantages

• Quality consistency: Statistical process control (SPC) with 100% online coating thickness measurement (XRF) and zero spangle uniformity across every coil – backed by mill test certificates (MTC) and third-party SGS/Bureau Veritas optional.

• Supply reliability: Vertically integrated mills with 200,000+ MT annual dedicated Galvalume capacity; 24/7 order tracking and buffer stock in Rotterdam, Houston, and Shanghai hubs.

• Logistics capability: In-house warehousing and negotiated carrier rates enable 7-day EXW, 15-day CIF major ports, with anti-telescoping coil packaging and edge protection standard.

• Price competitiveness: Direct mill allocation removes 2–3 intermediary margins; volume-based discounts published quarterly on a transparent index.

• Sustainability: 100% recyclable, Cr⁶⁺-free passivation available, and pre-paint-ready surface reduces on-site solvent usage. Compliant with LEED v4 MR Credit for recycled content.

• Technical support: Dedicated metallurgical engineers provide coil slitting optimization, corrosion life modeling (ISO 9223), and site failure analysis at no charge for contract buyers.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): BULK 20MT (can be mixed thicknesses or widths within the same commercial grade)

• Loading capacity (MT per 20ft container): 20 MT (standard steel skid packaging, max coil width 1,000 mm)

• Loading capacity (MT per 40ft container): 25 MT (optimized stacking and coil orientation, max coil width 1,250 mm)