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What Is Aluzinc Steel?

Aluzinc steel is a kind of highly corrosion-resistant material. It is formed with cold-rolled steel and applied with a coating consisting of 55% aluminum, 43.3% zinc, and 1.6% silicon. It is also known as Galvalume steel. Aluzinc-coated steel is more durable and long-lasting than galvanized steel, which is a versatile material for exterior roofing or wall panels, chimney breasts, the substrate of color-coated steel, etc.

Galvalume Coil

Galvalume Coil

Galvalume Metal Sheet

Aluzinc Metal Sheet

What Is Aluzinc Steel?

Aluzinc coating consists of 55% aluminum, 43.3% zinc, and 1.6% silicon (55% Al-Zn coating). The production process of aluzinc steel sheet and coil is similar to that of galvanized steel, that is, hot-dip continuous coating process.

Hot-dip Galvalume Process

Galvalume Process

Its corrosion resistance is 2-5 times better than that of galvanized steel. Besides, it has good heat resistance, which can withstand a high temperature of more than 300 degrees. Its surface is smooth with beautiful spangles. But its forming and welding performance is slightly poor. Aluzinc steel is mainly used for roofing and walls, electrical cabinets, home appliances, automobiles, substrates of prepainted steel, etc.

Uses of Aluzinc-Coated Metal

Construction use: Roofing and walls of civil and industrial buildings, garage doors, grilles, shutters, ventilation ducts, prefabricated houses, etc.

Automotive industry: mufflers, exhaust pipes, wiper accessories, fuel tanks, truck boxes, etc.

Home appliances: refrigerator back panel, gas stove, air conditioner, electronic microwave oven, LCD frame, CRT explosion-proof belt, LED backlight, electrical cabinet, etc.

Agricultural use: pig houses, chicken houses, granaries, greenhouse pipes, etc.

Others: heat insulation covers, heat exchangers, dryers, water heaters, vending machines, etc.

Use Guide of Aluzinc Steel

1. Use galvanized sheets instead of GL steel under an alkaline environment;

2. The aluzinc roofing sheets should be installed with a certain slope, which is conducive to drainage and avoids corrosion;

3. Avoid direct contact with wet cement and wet wood, lead, copper, and graphite;

4. Try to not cut on the GL sheets on the construction site;

5. It is not recommended to use alcohol solvents to wipe and clean the surface to avoid damage to the coating surface.

Aluzinc Steel VS Galvanized Steel

1. Excellent Corrosion Resistance

The corrosion resistance of aluzinc steel is mainly due to the protection of aluminum. When the zinc is worn away, the aluminum will form a dense layer of aluminum oxide, which prevents the corrosive substances from further corroding the interior.

2. Superior Heat Resistance

The thermal reflectivity of Al-Zn coated steel is very high, which is twice that of galvanized sheet. It has good heat resistance, which can withstand a high temperature of more than 300 degrees Celsius. So it is often used in chimney pipes, ovens, lighting, lampshades, etc.

3. Good Adhesion

There is excellent adhesion between the aluzinc sheet and the paint. So it can be painted without pretreatment and weathering.

4. Beautiful Appearance

The surface of galvalume steel is smooth and with even spangles, which is more beautiful than GI steel. So it can be used directly as roofing sheets. Galvanized steel looks bright and shiny.

Spangles of Galvalume Coil

Spangles of Galvalume Coil

Normal Spangles on Galvanized Steel

Normal Spangles on Galvanized Steel

Below is a table for your reference.

Item Corrosion resistance Heat resistance Weldability Adhesion Cutting edge  protection  Anode protection
Galvanized steel Good Good Good Good Good Good
Galvalume steel Excellent Excellent Poor Great Great Good


Wanzhi Steel is a leading manufacturer of aluzinc steel sheets and coils in China. The stock thickness is 0.2-2 Also, we supply galvanized steel, zinc magnesium aluminium coated steel, and pre-painted steel in coils, sheets, and strips. Moreover, we offer value-added services, such as profiling, cutting, slitting, etc. Welcome to contact us for more details.

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