● The Aluminum-Zinc Coated Steel Coil is a high-performance, corrosion-resistant steel product. Its coating consists of approximately 55% aluminum, 43.4% zinc, and 1.6% silicon. This alloy coating combines the superior corrosion resistance and heat resistance of aluminum with the galvanic protection of zinc. Its service life can be 2 to 6 times longer than that of standard galvanized steel under comparable conditions. The product features a distinctive bright, spangled appearance and offers good heat resistance and thermal reflectivity. It is widely used for roofs and walls in industrial plants and storage facilities, as well as in heat-resistant components like ovens and automotive exhaust systems, representing a cost-effective protective solution.Galvalume steel coil (typically with 55% Al-Zn alloy coating) offers excellent overall performance, with corrosion resistance 2-4 times that of regular galvanized steel of comparable coating weight, along with good heat resistance.
Coating Composition
55% Aluminum
43.4% Zinc
1.6% Silicon - Silicon is added to inhibit the excessive growth of brittle iron-aluminum intermetallic layers.
Coating Weight/Thickness - Core Parameter
Unit: g/m² (Total both sides)
Common Designations & Meaning:
AZ 70 (35/35) - 35g/m² min per side, 70g/m² total.
AZ 100 (50/50)
AZ 120 (60/60)
AZ 150 (75/75) - Most common for building roof/wall
AZ 180 (90/90)
AZ 200 (100/100)
Corrosion Resistance Comparison: The corrosion resistance of AZ150 is generally superior to GI Z275 (135/135).
Yield Strength (YS)
Unit: MPa
DX51D+AZ: 140 - 300 MPa
DX52D+AZ: 180 - 320 MPa
DX53D+AZ: 180 - 320 MPa
DX54D+AZ: 140 - 260 MPa
Tensile Strength (TS)
Unit: MPa
DX51D+AZ: 270 - 500 MPa
DX52D+AZ: 270 - 420 MPa
DX53D+AZ: 270 - 380 MPa
DX54D+AZ: 270 - 350 MPa
Elongation (El)
Unit: %
DX51D+AZ: ≥ 20%
DX53D+AZ: ≥ 26%
DX54D+AZ: ≥ 30%
| Category | Parameter | Conventional Value/Ranges | Notes |
| Substrate | Steel Grade | DX51D+AZ | Most common for building applications |
| Substrate | Thickness | 0.4mm – 0.8mm | |
| Substrate | Width | 1000mm, 1250mm, 1200mm | Common widths |
| Coating | Coating Mass | AZ100 – AZ180 | AZ150 is the gold standard for construction |
| Coating | Treatment | Chromium-free / Oiled | |
| Coating | Finish | Spangle-Free | Recommended for painting |
| Performance | Yield Strength | 140 – 300 MPa (DX51D) | |
| Performance | Tensile Strength | 270 – 500 MPa (DX51D) | |
| Performance | Elongation | ≥ 20% (DX51D) |
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