Galvalume Steel Sheet Carbon Steel — Factory Direct Supplier | Huaxia-Steel

Galvalume steel sheet combines the strength of carbon steel with the corrosion resistance of an aluminum-zinc alloy coating. Containing approximately 55% aluminum, 43.4% zinc, and 1.6% silicon, the AZ coating outperforms traditional galvanized steel in harsh atmospheric environments. Huaxia-Steel supplies Galvalume coil and sheet in AZ50 to AZ150 coatings, tailored for roofing, cladding, and appliance panels.

Product Overview

Galvalume is produced by hot-dipping cold-rolled steel into a molten Al-Zn-Si bath. The resulting microstructure features an aluminum-rich outer layer for barrier protection and a zinc-rich inner layer for sacrificial cut-edge protection. This dual mechanism delivers 2–4× the service life of galvanized steel in marine and industrial atmospheres.

Specifications

Parameter	Standard / Range
Base Steel Grade	DX51D+AZ, DX52D+AZ, CS Type B per ASTM A792
Coating Designation	AZ50, AZ70, AZ90, AZ150 (g/m², both sides)
Thickness	0.16 mm – 2.0 mm
Width	600 mm – 1,500 mm (slit coils available)
Coil Weight	3 – 12 metric tons
Surface Finish	Regular spangle, minimized spangle, skin-passed
Oil Passivation	Chromated / chromate-free / oiled

Available Steel Grades

• Commercial Quality (CQ): DX51D+AZ, CS Type B
• Drawing Quality (DQ): DX52D+AZ, DS Type B
• Structural Quality (SQ): S350GD+AZ, SS Grade 50/80 per ASTM A792
• High-Strength Low-Alloy: S550GD+AZ

Manufacturing Standards

• ASTM A792 / A792M – Standard for Steel Sheet, 55% Al-Zn Alloy-Coated
• EN 10346 – Continuously Hot-Dip Coated Steel Flat Products
• JIS G3321 – Hot-Dip 55% Al-Zn Alloy-Coated Steel Sheets and Coils
• GB/T 2518 – Chinese Standard for Continuously Hot-Dip Coated Sheet

Applications

• Industrial and residential roofing systems
• Wall cladding and facade panels
• Garage doors and appliance outer panels
• HVAC ducting and air-handling units
• Agricultural buildings and grain silos

Quality Assurance

Every Galvalume coil is tested for coating weight (X-ray fluorescence), adhesion (tape test), bend ductility (T-bend), and salt-spray resistance. Mill test certificates include base-steel chemistry, mechanical properties, and coating-mass readings per side. Third-party inspection by SGS, BV, or TÜV is available on request.

Packing and Shipping

Coils are shipped eye-to-sky or eye-to-wall on wooden skids, wrapped in VCI film and edge protectors. Sheets are palletized with paper interleaving and steel strapping. Moisture-absorbent packets are included for ocean freight. Standard packaging is seaworthy and suitable for 20-ft and 40-ft container loading.