Galvalume steel coil offers excellent corrosion resistance
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Galvalume steel coil uses cold-rolled or hot-rolled steel as a substrate. Through a continuous hot-dip coating process, a layer of alloy coating composed of aluminum, zinc, and a small amount of silicon is deposited on the substrate. Combining the advantages of aluminum and zinc, it offers excellent corrosion resistance and good workability, making it a highly efficient and economical corrosion-resistant steel.
As the foundation for galvalume steel coil, the substrate is typically made of high-quality cold-rolled or hot-rolled steel. Cold-rolled substrates offer a smooth surface and high thickness accuracy, making them suitable for applications requiring high appearance and machining precision. Hot-rolled substrates offer higher strength and a relatively lower cost, making them ideal for applications requiring high strength but less demanding appearance.
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Material |
SGCC,SGCH,G550,DX51D,DX52D,DX53D,DX54D,DX554D,S280GD,S350GD |
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Standard |
JIS-CGCC, JIS-G3312, ASTM-A635, EN-1043, EN-1042,etc. |
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Alu-Zinc coating |
30-275g/m2 |
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Surface treatment |
Light oil,Unoil,dry,chromate passivated,non-chromate passivated |
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Thickness |
0.12-3mm or customized |
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Width |
600-1250mm or customized |
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Length |
1000mm-12000mm or customized |
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Tolerance |
Thickness: +/-0.02mm, Width:+/-2mm |
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Processing service |
Bending, Welding, Decoiling, Cutting, Punching |
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Payment term |
30% payment by T/T as deposit, the balance 70% before dispatch or received the copy of the BL or 70%LC |
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Packing |
Standard Seaworthy Packing |
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Spangle |
Regular spangle,minimal spangle, zero spangle,big spangle |
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Price term |
CIF CFR FOB EX-WORK |
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Delivery term |
7-15 workdays |
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MOQ |
10 Tons |
Excellent Corrosion Resistance
Galvalume steel coil's corrosion resistance is one of its most prominent properties, far exceeding that of traditional hot-dip galvanized steel coil.
- Barrier Protection: The aluminum in the coating forms a dense aluminum oxide film on the surface of the steel coil. This stable film effectively blocks contact between oxygen, moisture, carbon dioxide, and other corrosive media, acting like a protective shield for the substrate, ultimately slowing corrosion.
- Sacrificial Anodic Protection: When the coating is scratched or damaged, exposing the substrate, the zinc in the coating preferentially undergoes electrochemical corrosion, providing sacrificial anodic protection and preventing corrosion. This "self-healing" protective mechanism significantly extends the service life of the steel coil.
- Salt Spray and Acid Rain Resistance: Galvalume steel coils perform exceptionally well in coastal environments with salt spray or in industrial areas subject to frequent acid rain. Testing has shown that their salt spray resistance is 3-5 times that of ordinary hot-dip galvanized steel coils. In neutral salt spray tests, they can withstand over 1,000 hours without developing red rust. They also effectively resist acid rain with a pH of 4.0-6.0, minimizing corrosion damage.
