Galvalume Steel Manufacturer – Strips, Pipes & Sheets
Yanshan Steel is your trusted manufacturer and supplier of Galvalume (Al-Zn alloy coated) steel. Combining the barrier longevity of aluminum with the sacrificial galvanic protection of zinc, our Galvalume products deliver up to 6 times longer lifespan than conventional galvanized steel in harsh atmospheric and coastal climates.
Specifications of Galvalume (Al-Zn Alloy Coated) Steel
Manufactured strictly in accordance with ASTM A792, EN 10346, and JIS G3321 international standards.
| Specification Item | Mill Specification & Dimension Range |
|---|---|
| Base Metal Substrate | Prime Cold-Rolled (CRC) or Continuous Hot-Rolled (HRC) steel strip |
| Coating Chemical Composition | 55% Aluminum, 43.4% Zinc, 1.6% Silicon (intermetallic bonded) |
| Coating Mass Designation | AZ30, AZ50, AZ60, AZ70, AZ90, AZ100, AZ120, AZ150 g/m² (total both sides) |
| Sheet / Coil Thickness Range | 0.15 mm – 2.50 mm (±0.015 mm precision gauge tolerance) |
| Width Range Available | 600 mm – 1250 mm (Precision rotary slitting down to 10mm width) |
| Surface Treatment Options | Anti-Fingerprint (AFP clear / tinted), Chromated, Passivated, Lightly Oiled, Skin-Passed |
| Spangle Appearance | Regular Spangle, Minimized Micro-Spangle with metallic silvery luster |
| Governing Standards | ASTM A792/A792M, EN 10346 DX51D+AZ / S350GD+AZ, JIS G3321, GB/T 14978 |
| Inner Diameter (ID) | 508 mm (20 inch) / 610 mm (24 inch) |
| Export Packaging | Waterproof barrier paper + galvanized iron outer cover + eye-to-sky wooden pallets |
Advantages of Galvalume Steel
Why engineers and pre-engineered metal building fabricators worldwide prefer 55% Al-Zn alloy coated steel:
1. Superior Atmospheric Corrosion Resistance
In outdoor atmospheric exposure, Galvalume steel demonstrates 2 to 6 times greater corrosion resistance than standard hot-dip galvanized steel with equivalent coating thickness.
2. Outstanding Heat Reflectivity
Reflects more than 70% of incident solar thermal radiation, making it an premier cool-roofing material that dramatically reduces air conditioning energy costs.
3. High-Temperature Oxidation Resistance
Withstands continuous high-temperature service up to 315°C (600°F) without surface discoloration or scaling, and up to 700°C under intermittent cyclic duty.
4. Exceptional Paintability & Formability
The micro-crystalline spangle surface exhibits superior paint primer adhesion without requiring pre-weathering, while accommodating tight radius roll-forming without micro-cracking.
5. Sacrificial Cut-Edge Self-Healing
When sheared or drilled, the zinc component of the Al-Zn alloy migrates galvanically across the exposed cut edge, providing long-term sacrificial cathodic protection against edge rust.
6. Modern Silvery Architectural Aesthetics
Uniform crystalline spangle with smooth anti-fingerprint resin finish maintains an attractive metallic appearance for modern unpainted industrial roofing.
7. 100% Recyclable Green Building Material
Environmentally sustainable and fully recyclable, contributing toward LEED certification points in sustainable building design.
Galvalume Steel vs. Galvanized Steel: Key Technical Differences
Both materials offer distinct advantages; selection depends on environmental corrosivity and target operating temperatures.
| Evaluation Factor | Galvalume Steel (55% Al-Zn / GL) | Galvanized Steel (Hot-Dip Zinc / GI) |
|---|---|---|
| Coating Composition | 55% Aluminum + 43.4% Zinc + 1.6% Silicon | 99% Pure Zinc with trace antimony/lead |
| Corrosion Lifespan | 2x to 6x longer in atmospheric and marine zones | Standard outdoor protection (15–25 years) |
| High-Temperature Limits | Continuous 315°C without discoloration; 700°C peak | Starts peeling and discoloring above 200°C |
| Heat / Solar Reflectivity | Reflects > 70% of solar radiation (Cool Roof rated) | Reflects ~40%–50% of solar thermal energy |
| Environmental Suitability | Ideal for industrial, acid rain, and coastal roofs | Better in highly alkaline or agricultural ammonia environments |
| Surface Finish & Resin | Anti-Fingerprint (AFP) resin coating standard | Oiled or passivated chemical treatment |
Galvalume Steel Applications Across Global Markets
Architectural Roofing & Cladding
The global benchmark material for commercial standing seam roofs, industrial pre-engineered steel buildings (PEB), and wall facades.
High-Temperature & Automotive
High oxidation endurance makes Galvalume the ideal cost-effective substitute for aluminized and stainless steels.
Agricultural & Household Appliances
Exceptional surface cleanliness, durability, and moisture protection for long-term domestic and agricultural equipment.
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