AZ150 Galvalume Steel Sheet / Aluminum Zinc Coated Steel Coil

Galvalume (also called Aluzinc or aluminum-zinc coated steel) is a hot-dip coated steel sheet whose coating is composed of 55% aluminum, 43.4% zinc and 1.6% silicon. This alloy coating combines the barrier protection of aluminum with the sacrificial (galvanic) protection of zinc, delivering 2-6 times the corrosion resistance of ordinary hot-dip galvanized steel at the same coating weight.

Key Features

• Excellent corrosion resistance - ideal for long-life roofing and cladding
• High heat reflectivity and low thermal expansion
• Good formability and paintability for post-processing
• Anti-fingerprint, chromated and oiled surface options available

Specifications

Available as coil, sheet and strip. Custom sizes, coatings and spangle types can be produced to your requirements. Please contact us for the latest price and free samples.

AZ150 Galvalume Steel Sheet

Alias: Aluzinc / Zincalume, Hot-dip 55% Al-Zn coated steel Standards: ASTM A792, EN 10346, JIS G3321 Definition: AZ150 means total coating mass 150 g/m² on both sides (75 g/m² per side), 55% aluminum-zinc alloy hot-dip coated low carbon steel substrate

1. Chemical Composition

Two parts: Coating Alloy and Steel Substrate (typical DX51D+AZ)

1.1 Coating Alloy (wt%)

表格

Silicon improves coating adhesion and prevents intermetallic layer growth during hot dipping. Aluminum provides barrier protection; zinc provides sacrificial cathodic protection for cut edges & scratchesAnsteel Gr....

1.2 Substrate Steel (DX51D+AZ, wt%)

Other substrate grades available: DX52D+AZ, DX53D+AZ, DX54D+AZ, S220GD, S250GD, S350GD, S550GD for different forming / strength requirements.

2. Mechanical Properties (room temperature, typical values)

Physical Properties

• Coating thickness: ~18 μm per side, total ~36 μm
• Maximum long-term service temperature: 315°C (much higher than ordinary hot-dip galvanized steel)
• Solar reflectivity: ≥75%, good heat reflection
• Surface: Silver-grey spangle pattern; options: bare, chromate passivated, anti-fingerprint (AFP), oiled
• Density: ~7.85 g/cm³ (substrate steel)

3. Corrosion Characteristics

1. 2–6 times longer service life than conventional hot-dip galvanized steel with same coating weight.
2. Dual protection: Aluminum forms dense barrier film; Zinc offers sacrificial protection on cut edges and scratches.
3. Good atmospheric corrosion resistance, suitable for rural, mild industrial and coastal low-chloride environments.
4. Not recommended for strong acid, continuous immersion in salt water or heavy chloride splash zones.
5. Anti-oxidation performance at high temperature is superior to GI galvanized sheet.

4. Applications

Construction (largest market)

• Metal roof panels, wall cladding, gutters, downpipes
• Warehouse, factory, poultry house, greenhouse, garage, partition panels
• Light steel structure components

Home Appliance

• Refrigerator back panels, air conditioner casings, electrical control cabinets, microwave parts

Automotive

• Mufflers, exhaust shields, truck body parts, wiper components

Other industries

• Heat exchangers, dryers, ventilation ducts, agricultural silos, solar mounting brackets

5. Fabrication Notes

1. Forming: Good bendability. DX52D/DX53D preferred for deep drawing; DX51D for simple profiling.
2. Welding: Can be spot welded and arc welded. Weld area will lose coating, so post-weld touch-up is required for corrosion protection.
3. Paintable: Excellent base for paint / PVDF / polyester coating, widely used as substrate for prepainted steel (PPGI/PPGL).
4. Limitation: Avoid prolonged contact with wet cement, strong alkaline or acidic media.

6. Quick Comparison: Galvalume AZ150 vs GI Galvanized