Galvalume Metal

Galvalume is a silver alloy coating metal with a smooth surface and beautiful sequins. The galvalume alloy structure is composed of 55% aluminum, 43.4% zinc and 1.6% silicon, and is cured at a high temperature of 600°C. Due to this special coating structure, it has the advantages of excellent corrosion resistance, good process performance, heat resistance, and long life.

Its process is the same as galvanized steel and aluminum steel, using a continuous hot dip process. The corrosion resistance of the 55% aluminum-zinc alloy coating of galvlume steel is better than that of galvanized steel of the same thickness.

Wanzhi Steel offers aluminum-zinc coated steel in various standards, with thicknesses ranging from 0.13 mm to 2.0 mm. A variety of substrates and coatings are available, and customization is also accepted. Please contact us for more information.

Galvalume Metal Specifications

Item	Galvalume Metal
Place of Origin	Shandong, China
Standard	AISI, ASTM, DIN, JIS, GB, EN
Material	DX51D+AZ, DX52D+AZ, DX53D+AZ, S220GD-S550GD
Al-Zn Coating	AZ30-AZ150
Thickness	0.13 mm – 2.0 mm
Width	600-1,250 mm
Width	Customizable
Coil Weight	3-8 tons or as per your requirements
Aluminum Content	55%
Sample	Free Available
Payment term	TT 30% Advance + 70% Balance
Price Item	FOB, CIF, EXW, CFR, etc
Packing	Standard export packaging
Certification	ISO 9001, SGS, ABS, BV
MOQ	10 tons
Transportation	By land, by sea

What is Galvalume?

Galvalume, commonly known as 55% aluminum-zinc alloy coated steel, is essentially a composite coating that combines 55% aluminum, 43.4% zinc, and 1.6% silicon. These components are melted at high temperatures and then uniformly coated onto a steel substrate using a continuous hot-dip galvanizing technique, resulting in a triple-protective coating.

• Aluminum (55%) provides “barrier protection”: Aluminum rapidly forms a dense alumina film in air, effectively preventing the intrusion of moisture and corrosive substances, providing excellent resistance to atmospheric corrosion.
• Zinc (43.4%) provides “sacrificial protection”: When the steel substrate is exposed due to cutting or scratching, zinc, with its more reactive electrochemical properties, preferentially corrodes as the anode. It “sacrifices” itself to block the corrosion process of the steel substrate.
• Silicon (1.6%) as a “key medium”: The addition of silicon effectively inhibits the formation of brittle intermetallic compounds between the aluminum-zinc alloy and the steel substrate at high temperatures, ensuring a strong bond between the coating and the steel sheet, giving it excellent processability.

Benefits Of Galvalume Metal

1. Thermal reflectivity: Galvalume metal had high thermal reflectivity, twice that of galvanized steel. You can use it as a thermal insulation material

2. Heat resistance: Because of its good heat resistance, galvalume metal can withstand a high temperature of more than 300℃. It is often used in chimney tubes, ovens, illuminators, and daylight lampshades.

3. Corrosion resistance: Due to aluminum having a protective function, galvalume metal has high corrosion resistance. If the zinc is worn, the aluminum will prevent the corrosion resistance from further eroding the interior.

4. Easy to paint: Galvalume metal and paint have excellent adhesion, do not need pretreatment, and weathering treatment can be painted.

5. Corrosion resistance: The comprehensive anti-corrosion capacity of 55% galvalume metal is 4 times that of galvanized steel.

Uses

Galvalume metal has the advantages of corrosion resistance, hot resistance, cost-effectiveness, thermal reflectivity, etc. Therefore, galvalume metal is widely used in commercial buildings, automobiles, household appliances, and agriculture. In addition, many clients order galvalume metal to produce color-coated steel. The specific applications of galvalume steel are as follows.

• Buildings: roofs, walls, garages, sound walls, pipes and composite houses, etc.
• Automobiles: mufflers, exhaust pipes, wiper accessories, fuel tanks, truck boxes.
• Household appliances: refrigerator backboard, gas stove, air conditioner, electronic microwave oven.
• Agricultural use: Pig house, chicken house, granary, greenhouse pipe, etc.

Galvalume vs. Galvanized: Which Is Better?

1. Coating Composition

• Galvanized Steel: A single layer of zinc plating on the steel surface, relying solely on zinc for protection.
• Aluminum-Zinc Alloy: A layer of zinc-aluminum-silicon alloy (55% Al + 43.4% Zn + 1.6% Si) is coated on the surface of galvanized steel, providing multiple layers of protection.

2. Performance Comparison

• Corrosion Resistance: Galvalume steel exhibits superior corrosion resistance compared to galvanized steel, especially in salt spray, humid, or chemically corrosive environments.
• Heat Resistance: Galvalume alloy can withstand temperatures above 300°C, while galvanized steel may experience performance degradation due to zinc oxidation above 200°C.
• Durability: Under harsh conditions, the service life of aluminum-zinc alloy is 2-3 times that of galvanized steel.

3. Application Scenarios

• Galvanized steel: Suitable for general environments, such as indoor furniture, non-coastal buildings, and low-corrosion automotive parts.
• Galvalume steel: Ideal for highly corrosive environments (chemical plants, coastal areas, marine facilities) and high-temperature applications.

4. Cost & Appearance

• Cost: Due to high-temperature processing and stringent quality control, the production cost of galvalume steel sheet is higher than that of galvanized steel sheet.
• Appearance: Galvalume steel has a smooth, shiny, silvery surface, while galvanized steel sheet has a relatively darker surface.

Note: In extreme environments, the cutting edges of galvalume steel sheet may require additional protection.

When choosing between GL and GI steel, the primary consideration should be the application requirements and environment. If you are unsure which to choose, our professional engineers are available to assist you. Please feel free to contact us!

Galvalume Metal Exporter-Wanzhi Steel

Galvalume metal includes galvalume steel coil and galvalume steel sheet. Every year, lots of clients import Galvalume metal from China. Wanzhi Steel is a professional manufacturer and exporter of galvalume metal.

• We have two advanced galvalume metal production lines with an annual 300000 tons.
• High technology and precise instruments to ensure the product size is with zero error.
• We also produce color-coated steel coil; all RAL colors are available. Provide PE, HDP, PVDF, and SMP four paint options.
• We can provide customers with a full range of one-stop services. Available in various forms including plates, coils, strips, and tubes.
• Provide all machining services such as punching, embossing, slitting, cutting, etc.
• If you want to visit the factory, you can contact us in advance, and we will send a car to pick you up.

Conclusion

In an era that prioritizes sustainable development and long-term value, galvalume steel, with its reliable performance, is an ideal material for building roofs, industrial facilities, and agricultural equipment. It operates reliably in harsh climatic conditions, such as coastal, humid, and high-temperature environments, reducing maintenance costs and minimizing environmental impact with its exceptionally long service life.

Whether you’re building commercial buildings, manufacturing automotive parts, or upgrading agricultural facilities, aluminized zinc steel sheets deliver lasting value to your projects with their superior performance and economic benefits. Contact Wanzhi Steel today to discuss your needs, get a quote, or request a free sample.