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Galvalume steel is a carbon steel sheet coated with an aluminum-zinc alloy (55%Aluminum, 43.4% Zinc, 1.6% Silicon) via a hot-dip process, offering superior corrosionresistance, high-temperature oxidation resistance, and long-term durability. It acts as aself-healing material against rust at cut edges, lasting up to twice as long as galvanizedsteel of similar thickness, making it ideal for roofing, siding, andappliances.
Galvalume is primarily used to protect iron-based alloys that are prone to rust. Galvalume-coated steel is better able to resist oxidation than plain carbon steel because the zinc and aluminum protect the underlying steel from the environment. The zinc also will more readily oxidize than the steel it contacts. This is similar to galvanized steel.
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation % (No less than, A₈₀mm) |
|---|---|---|---|
| DC51D+AZ | 190~360 | 270~500 | 22 |
| DC52D+AZ | 140~300 | 270~420 | 26 |
| DC53D+AZ | 140~260 | 270~380 | 30 |
| DC54D+AZ | 120~220 | 260~350 | 36 |
| Q/BQB 425 | QB/T 14978 | AS 1397 | EN 10346 | ASTM A792M | JIS G 3321 |
|---|---|---|---|---|---|
| DC51D+AZ | DX51D+AZ | G2+AZ | DX51D+AZ | CS type BCS type C | SGLCC |
| DC52D+AZ | DX52D+AZ | G3+AZ | DX52D+AZ | DS | SGLCD |
| DC53D+AZ | DX53D+AZ | - | DX53D+AZ | - | SGLCDD |
| DC54D+AZ | DX54D+AZ | - | DX54D+AZ | - | - |
| S250GD+AZ | S250GD+AZ | G250+AZ | S250GD+AZ | SS 255 | - |
| S300GD+AZ | S300GD+AZ | G300+AZ | - | - | SGLC400 |
| S350GD+AZ | S350GD+AZ | G350+AZ | S350GD+AZ | SS 345Class1 | SGLC440 |
| S450GD+AZ | - | G450+AZ | - | SS 410SS 480 | SGLC490 |
| S550GD+AZ | S550GD+AZ | G550+AZ | S550GD+AZ | SS 550Class1 | SGLC570 |
The main difference between galvanizing and Galvalume is that galvalume is a combination of zinc, aluminum, and silicon, while galvanizing is 100% zinc. The makeup of the three elements in a Galvalume coating is just over 50% aluminum, just under 50% zinc, with trace amounts of silicon.
An advantage that Galvalume has over normal galvanized material is that it has enhanced protection abilities. Over time, Galvalume tends to perform better than galvanized steel, especially when exposed to water or other liquids that can speed up the oxidation process. Even after a few decades, Galvalume-coated steel will be less likely to rust than normal galvanized steel.
Galvalume is also considered more aesthetically pleasing than hot-dipped galvanized materials.
Galvalume is applied to a material using the hot-dipping process. Therefore, a Galvalume coating has similar thicknesses to that of hot-dipped galvanized material. The thickness for the hot-dipping process is around 1 mil thick. The thickness can range somewhat depending on the coating specification. If the coating thicknesses of a Galvalume-coated steel and a galvanized steel are equal, the Galvalume steel will generally outlast the galvanized one, depending on the environment.
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Q: 1. What is Galvalume Steel?
A: Galvalume is a carbon steel sheet coated with an alloy of 55% aluminum, 43.4% zinc, and 1.6% silicon. This unique coating combines the barrier protection of aluminum with the sacrificial protection of zinc, offering superior durability compared to standard steel.
Q: 2. What is the difference between Galvalume (GL) and Galvanized (GI)?
A: This is the most common inquiry from buyers:
Coating Composition: Galvanized steel is coated with 100% zinc, while Galvalume features an aluminum-zinc alloy.
Corrosion Resistance: Galvalume typically lasts 2 to 4 times longer than Galvanized steel in most atmospheric conditions.
Appearance: Galvalume has a smoother, smaller, and more distinct metallic "spangle" (crystal pattern) compared to the larger flakes often seen on Galvanized steel.
Q: 3. How long is the service life of Galvalume Steel?
A: Under normal environmental conditions, high-quality Galvalume steel offers a perforation-resistant life of 20 to 25 years. Its exceptional resistance to rust makes it the premier choice for long-term outdoor infrastructure.
Q: 4. Can Galvalume Steel be painted?
A: Yes. Galvalume is an excellent substrate for Prepainted Galvalume (PPGL). Its surface provides great paint adhesion. However, it is crucial to ensure the surface is clean and dry; typically, no complex pre-treatment is required for industrial coating.
Q: 5. How does it perform in high-temperature environments?
A: Galvalume has excellent heat resistance. It can withstand temperatures up to 315°C (600°F) for long periods without surface discoloration or oxidation. This makes it ideal for oven components, chimney pipes, and water heater parts.
Q: 6. What are the primary applications of Galvalume?
A: Construction: Roofing, wall panels, garage doors, and fencing.
Appliances: Refrigerator base plates, air conditioning systems, and microwave oven linings.
Automotive: Mufflers and exhaust pipe heat shields.
Agriculture/Industry: Grain bins, ventilation ducts, and outdoor electrical cabinets.
Q: 7. Is Galvalume suitable for livestock or animal housing?
A: Not recommended. This is a critical limitation. The aluminum-zinc coating degrades quickly when exposed to ammonia (alkaline environments) produced by animal waste. For barns or animal sheds, heavy-duty Galvanized (GI) steel is usually the better choice.
Q: 8. Does Galvalume have high thermal reflectivity?
A: Yes. Galvalume has high heat reflectivity (approx. 65%–75%). It reflects a significant amount of solar heat, which can substantially reduce indoor cooling costs during the summer. It is considered an energy-efficient "cool roofing" material.
Q: 9. How is the formability and weldability of Galvalume?
A: Galvalume steel offers excellent formability, allowing it to be bent, stamped, and folded similarly to galvanized steel. While it is weldable, welding parameters may need adjustment due to the aluminum content to ensure a strong, clean joint.
Q: 10. Why do black spots sometimes appear on Galvalume?
A: If Galvalume coils are stored in damp, poorly ventilated areas, moisture can get trapped between the layers, causing a chemical reaction known as "Black Rust" or "Wet Storage Stain." To prevent this, always store material in a dry environment and request passivated (chromated) or oiled surface treatments from the manufacturer.
As one of the most professional galvalume steel manufacturers and suppliers in China, we're featured by good service and competitive price. Please rest assured to buy high quality galvalume steel for sale here from our factory. Contact us for pricelist and free sample.
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