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Galvalume Steel Coil
Product Overview
Our Aluzinc Steel Coil (also known as Galvalume®) is a high-quality coated steel product designed to offer the best combination of corrosion protection, heat reflectivity, and formability. The coating consists of approximately 55% aluminum, 43.5% zinc, and 1.5% silicon, creating a unique structure that delivers exceptional performance in a wide range of environments.
This product combines the long-term corrosion resistance of aluminum with the galvanic protection of zinc, making it an ideal choice for applications requiring durability, aesthetic appeal, and cost-effectiveness. Available in various thicknesses, widths, and surface finishes, our Aluzinc coils are manufactured to strict international standards (ASTM, JIS, EN) and are suitable for both indoor and outdoor applications.
Key Features & Buyer Benefits
| Feature | Benefit to You |
| Superior Corrosion Resistance | 2–4 times longer service life than conventional galvanized steel in most environments. Ideal for coastal, industrial, and polluted atmospheres. |
| Excellent Heat Reflectivity | Reflects up to 80% of radiant heat, reducing cooling costs in roofing applications and improving energy efficiency. |
| High Temperature Resistance | Withstands temperatures up to 315°C (600°F) without discoloration or degradation, suitable for oven panels and exhaust systems. |
| Cut-Edge Protection | The zinc component provides sacrificial protection at cut edges and scratches, preventing red rust from spreading. |
| Excellent Formability | Can be roll-formed, bent, stamped, and profiled without cracking or flaking of the coating. Suitable for complex shapes. |
| Smooth Surface Finish | Provides an excellent base for painting or can be used bare for a distinctive spangled or matte appearance. |
| Lightweight & Strong | Combines the strength of steel with the lightweight benefits of a thin, protective coating. |
| 100% Recyclable | Environmentally friendly and fully recyclable at end of life. |
Buyer Priorities Addressed
Durability vs cost: service life in various environments, lifecycle value.
Surface quality & paintability: suitability for prepainted coil (PPGL/PPGI) or bare use.
Process compatibility: coil ID/weight/width, formability, weldability for buyer equipment.
Standards & traceability: MTRs, coating mass reports, compliance with ASTM/EN/JIS/GB.
Logistics & packaging: export packing, MOQ, lead time, Incoterms and documentation.
Quick Specification Table (Typical Options)
| Item | Typical Range / Options | Buyer Notes |
| Base steel grades | DX51D, SGCC, SPCC, DC01, S220–S450 | Select by forming, stamping and strength needs |
| Base thickness | 0.12 mm – 3.0 mm (common: 0.25–1.5 mm) | Tight tolerances available on request |
| Strip/coil width | 600 mm – 2000 mm (common: 914, 1000, 1250 mm) | Slit/coils per buyer processing needs |
| Coil ID | 508 mm, 610 mm (others on request) | Must match buyer uncoiler |
| Coil weight | 0.5 MT – 10 MT per coil | Specify handling capacity limits |
| Coating type | Al‑Zn alloy (typically 55% Al / 43.4% Zn / 1.6% Si) | Market names: Galvalume, Aluzinc, Aluzinc etc. |
| Coating mass / thickness | AZ30 – AZ180 g/m² (expressed as g/m² total or g/m² per side) | Higher mass for aggressive environments; specify per side or total |
| Surface finish | Smooth, Embossed (rare), Silicon residue/Matte | Smooth finish favored for painting and reflective roofs |
| Surface treatment | Passivation, chromate-free passivation, oiling | Pre-treatment improves paint adhesion and storage resistance |
| Coating appearance | Bright/metallic with thin Al oxide layer | Less spangle than HDG; stable appearance for roofs |
| Tolerances & standards | Per ASTM A792 / EN 10346 / JIS G3321 / GB/T 2518 | Specify standard and tolerance class in contract |
| Packing | Inner VCI/kraft wrap, steel straps, wooden crate/pallet, shrink film | Custom export packing available for long voyages |
| Certificates & tests | MTR, coating mass report, third-party inspection (SGS/BV) | Specify required certification at inquiry |
| Lead time | 10–30 days depending on stock and customization | Rush options sometimes available |
| MOQ | Typically 1–5 MT per spec; depends on mill | Negotiable for long-term contracts |
Typical Applications (buyer-oriented)
Roofing & cladding: superior corrosion resistance and heat reflectivity improve roof life and energy performance.
Prepainted coil (PPGL): widely used as substrate for durable paint systems (coil coating for gutters, facades).
HVAC components & ducting: where improved corrosion resistance and heat stability are desired.
Agricultural buildings & storage: longer life in corrosive atmospheres than Zn coating.
Light gauge steel framing & purlins: offers good protection while allowing roll-forming.
Appliance panels & architectural elements: preferred when appearance and longevity matter.
FAQ — Frequently Asked Questions (for International Buyers)
Q: What is the difference between Al‑Zn coated coil (Galvalume) and traditional hot‑dip galvanized coil?
A: Al‑Zn coated coil uses an alloy coating (typically ~55% Al / 43.4% Zn / 1.6% Si) that offers better barrier protection, heat reflectivity, and long-term performance in many exposures compared to conventional Zn-only coatings.
Hot‑dip galvanized provides stronger sacrificial protection in some cut-edge or very aggressive environments, but Al‑Zn generally outperforms Zn for roof and cladding applications.
Q: How is coating mass specified for Al‑Zn coil?
A: Coating mass is usually given in g/m² (total or per side).
Typical ranges might be AZ30–AZ180 g/m² (total both sides or expressed per side—confirm which convention your supplier uses).
Higher coating mass increases corrosion life and price.
Q: Can Al‑Zn coils be painted or prepainted?
A: Yes. Al‑Zn is an excellent substrate for coil coating and prepainting (PPGL).
Proper surface pretreatment (passivation, cleaning) and primer selection are important to meet paint warranty and adhesion requirements.
Q: How does Al‑Zn perform in coastal or industrial environments?
A: Al‑Zn generally performs well in moderately aggressive environments and often better than Zn-only coatings on horizontal surfaces.
For extreme coastal or highly corrosive industrial environments, higher coating mass or specialized coatings (e.g., heavy AZ coating, stainless, or protective paint systems) may be required.
Request salt spray or cyclic corrosion data for critical projects.
Q: Are there any forming or welding concerns with Al‑Zn coils?
A: Generally Al‑Zn is formable and weldable for typical fabrication methods (bending, roll-forming, spot welding).
For tight bends, deep drawing, or specialized welding, run qualification tests (bend, mandrel, weld trials) and specify allowable forming radius to ensure coating integrity.
Q: What tolerances should I expect on thickness and width?
A: Tolerances follow applicable standards (ASTM A792, EN 10346, JIS G3321).
Thickness tolerance depends on nominal thickness (e.g., ±0.02–0.10 mm).
Always confirm required tolerances in the purchase order.
Q: Do you provide MTRs and third‑party inspections?
A: Yes. Mill test reports, coating mass reports, and third‑party inspections (SGS, Bureau Veritas, Intertek) are available and should be specified at RFQ stage.
Q: How should I store Al‑Zn coils upon arrival?
A: Store coils in a dry, ventilated area on dunnage, protected from direct contact with the ground and from condensation.
Do not expose coils to prolonged moisture; if anti-corrosive oil was applied, follow removal instructions before painting.
Contact our sales team today for a quotation or to discuss your project requirements. We are committed to providing high-quality galvalume steel coils that meet your exact specifications and delivery deadlines.
Your trusted partner in galvanized steel solutions.For further technical information, pricing, or customization, please contact our sales team:
Tel/WA/Wechat: +86 13225105678
Email: sales01@duohessplate.com
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