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Galvalume Steel

Galvalume steel refers to 55% Al-Zn coated steel products, which is also called aluzinc steel. GL steel is well suited for roofing and siding applications, as well as automotive, home appliances, furniture, etc. Due to its versatility, durability, beautiful appearance, galvalume steel is favored broadly. If you are looking for a galvalume steel factory (GL), please contact Wanzhi Steel right now.

Wanzhi Steel has both GL coils and sheets for sale, which are available from AZ30 to 150. The thickness is from 0.12 to 1.2 mm and the width is from 600 to 1,250 mm. More than that, we also offer cutting, slitting, and profiling services. Welcome to contact us for samples or visit our factory on-site.

GL Coil to the Philippines

AZ50 GL Coil to the Philippines

Galvalume Plain Sheets

Galvalume Plain Sheets

Galvalume Profile Sheets

Galvalume Corrugated Sheets

Product Details

Item Galvalume Steel
Material DX51D+AZ, DX52D+AZ, DX53D+AZ, S220GD-S550GD
Al-Zn Coating AZ30-AZ150
Thickness 0.13 mm-1.2 mm
Width 600-1,250 mm
Coil Weight 3-8 tons or as per your requirements
Aluminum Content 55%
Package Standard Export Package
Outer Packaging

Outer Packaging

Inner Packaging of Coil

Inner Packaging of Coil

SGS Test of Galvalume Steel

In order to meet our client’s requirements, our galvalume steel has been tested by SGS. The quality assurance specialists from SGS came to our factory to get samples and then tested the samples. Below are parts of the SGS test report for clients from Germany.

SGS Test Result

SGS Test Result

Result of SGS Test

Result of the SGS Test

Right Galvalume Steel for Your Needs

As shown above, the common types of GL steel include galvalume coil, galvalume corrugated sheet, and galvalume plain sheet. Thanks to its shiny spangled appearance, GL steel can be used as exterior panels without a layer of paint. Wanzhi Steel offers GL steel of 0.12-1.2 mm in thickness and 600-1,250 mm in width. Besides, the weight of the GL steel coil and the length of the flat sheet can be customized on the basis of your needs. Please talk to us for more details.

Galvalume Coil

Galvalume Coil

Galvalume Steel Sheets

Packaging of Galvalume Sheets

AZ50 vs AZ150 Galvalume Steel

There are various thicknesses of galvalume sheet metal. The galvalume coating thickness is expressed by AZ+number. According to ASTM A792 Standard, AZ50 galvalume means 0.50 ounces of aluminum zinc coating per square foot (double sides); AZ150 indicates the Al-Zn coating weight of 1.5 ounces per square foot double sides. Wanzhi Steel offers AZ30 to AZ150 galvalume finish.

Generally, the higher the number, the thicker the Al-Zn coating. Coating thickness greatly affects the protective effect to the substrate. That is, the thicker the coating, the better the durability. Therefore, AZ150 will be more durable and more expensive than AZ50.

Due to the different densities of zinc and aluzinc coatings, AZ50 is not the same as G50. The thickness of G50 galvanized steel is 10.6 μm per side. While the Al-Zn layer thickness of AZ50 is about 20 μm per side. That’s why AZ50 will be more long-lasting and expensive than G50. Below is a picture for your reference.

Coating Thickness

Coating Thickness

Note: 1 mil, thou = 25.4 µm

Great Features of Galvalume Steel

1. Excellent Corrosion Resistance

Similar to galvanized steel, the Al-Zn coating will protect the base metal. Especially, when the zinc layer is worn,  there will be a layer of dense alumina to prevent the base metal from further corrosion. It is proved that GL steel will serve 3 times longer than GI steel does. That’s why GL steel is preferred in severe environments.

2. Great Heat Resistance

Aluzinc steel has good heat resistance to withstand temperatures of more than 300 degrees Celsius, and it is often used in chimney pipes, oven illuminators, and lampshades.

3. High Heat Reflectivity

The thermal reflectivity of GL is twice of galvanized steel so it is often used as a heat-insulating material. Therefore, it is a better choice for roofing in a hot climate.

4. Beautiful Appearance

The surface of GL steel is smooth and with spangles, which makes it good-looking. So it can be used directly without painting.

Galvalume Steel Roof

Galvalume Roofing

GL Steel Wall

GL Steel Wall

Wide Applications of GL Steel

1. Construction Industry, for example, roofing, interior, and exterior wall panels, soundproof wall, pipes, garages, etc.
2. Automobile Industry, such as mufflers, exhaust pipes, wiper attachments, fuel tanks, truck containers, etc.
3. Home Appliances, for instance, refrigerator backboard, air conditioner, microwave oven, LED backlight, electric cabinet, etc.
4. Agricultural Uses, like a greenhouse, granary, piggery, chicken house, etc.
5. Other Industries, such as heat exchangers, dryers, etc.

Is Galvalume Sheet A Good Roofing Material?

Definitely, yes. GL sheet is light in weight but strong enough, which is a new kind of roofing material. Also, due to its high thermal reflectivity, GL roofing sheet is preferred in hot climates. Moreover, it has a gorgeous and smooth appearance so it is widely used in commercial, civil, and public buildings.

Home Appliances

Home Appliances



What Is Galvalume Steel?

Galvalume steel is similar to galvanized steel. It uses cold-rolled steel sheet as a substrate and then is coated with 55% aluminum, 43.4% zinc, and 1.6% silicon at 600 °C. While galvalume coating aims to protect steel from oxidation. Due to the protection of aluminum, it is better able to resist rusting and corrosion. If the coating thicknesses of GL steel and GI steel are equal, the GL one will be more long-lasting to use in the same environment. The common manufacturing process is known as the hot-dipping process. Let’s review step by step.

1. Pre-treatment

Through the pre-treatment system, the contaminants on the surface of the base metal will be removed. It often includes degreasing, rinsing, pickling, etc.

Hot-dip Galvalume Process

Galvalume Process

2. Hot-dip Galvalume Process

After going through the annealing furnace, steel sheets are dipped into the Al-Zn pool. Then there is an air knife to remove the extra coating to keep the thickness of the coating.

3. Inspection & Coiling

The coated steel sheet will go through the quality control system and then be rolled up for sale.

So the structure of Galvalume steel includes:

  • Base metal (cold-rolled steel sheets)
  • The al-Zn coating layer (top and back sides).

You can also check the videos of the manufacturing process through videos.

Galvalume Steel Structure

Galvalume Metal Structure

Galvalume Steel Codes

Chinese Code European Code American Code Japanese Code
DC51D+AZ DX51D+AZ CS type B, type C SGLCC
S250GD+AZ S250GD+AZ 255
S350GD+AZ S350GD+AZ 345 Class1 SGLC490
S550GD+AZ S550GD+AZ 550 SGLC570

What Color Is Galvalume Sheet?

The bare galvalume sheet is silver-white in color, with regular spangles. It looks not bright and shiny as a galvanized sheet, but its surface is more smooth. You can check the pictures below.

Which Is Better Galvanized or Galvalume Steel?

As for corrosion resistance, galvalume is better than galvanized steel. GI and GL steel are very similar. Both of them are coated to protect the base metal from rust. The coating allows metal panels to last decades longer than non-coated metal. Essentially, GL steel is 55% aluminum to 43.4% zinc, and 1.6% silicon alloy coated sheet steel. While GI is coated with a zinc layer. Al-Zn coating combines the toughness of zinc with the rust resistance of aluminum and provides barrier protection on the metal surface. It performs better in fighting corrosion than zinc coating. However, if the zinc coating is scratched, it can continue to corrode. So the service life of GL steel will be longer than that of GI steel. Also, GL steel has better heat resistance so that it is more suitable for home appliances.

However, in terms of the price, the galvalume sheet price will be higher than that of galvanized sheet.

Galvanized Coil with Spangles

Galvanized Coil with Spangles

Galvalume Coil

GL Coil

Galvalume vs Galvanized Steel Price

Generally speaking, galvalume steel will be more expensive. For example, for the same specification, AZ50 galvalume steel will be more expensive than G50 galvanized steel. But GL steel also has a longer service life. Moreover, the price is also influenced by other factors, such as the thickness, width, packaging, etc. And they are suitable for different environments. Welcome to contact us for a free quote.

24 Ga/ 26 Ga / 29 Ga Galvalume Sheet

Ga (gauge) is commonly used to describe the thickness of metal sheets or wires. In general, the higher the number, the thinner the sheet. For example, a 24 gauge GL sheet is about 0.7 mm in thickness; while a 26 gauge galvalume sheet is about 0.55 mm in thickness. And a 29 gauge galvalume steel sheet is about 0.45 mm in thickness. You can check the gauge chart below.

Materials Stainless Steel GI/GL Aluminum
Gauge inches (mm) inches (mm) inches (mm)
30 0.0125 (0.33) 0.0157 (0.40) 0.0100 (0.25)
29 0.0141 (0.36) 0.0172 (0.44) 0.0113 (0.29)
28 0.0156 (0.41) 0.0187 (0.47) 0.0126 (0.32)
27 0.0172 (0.43) 0.0202 (0.51) 0.0142 (0.36)
26 0.0187 (0.48) 0.0217 (0.55) 0.0159 (0.40)
25 0.0219 (0.56) 0.0247 (0.63) 0.0179 (0.46)
24 0.025 (0.64) 0.0276 (0.70) 0.0201 (0.51)
23 0.0281 (0.71) 0.0306 (0.78) 0.0226 (0.58)
22 0.0312 (0.79) 0.0336 (0.85) 0.0253 (0.64)
21 0.0344 (0.86) 0.0366 (0.93) 0.0285 (0.71)
20 0.0375 (0.95) 0.0396 (1.01) 0.0320 (0.81)
19 0.0437 (1.1) 0.0456 (1.16) 0.0359 (0.91)
18 0.0500 (1.27) 0.0516 (1.31) 0.0403 (1.02)
17 0.0562 (1.4) 0.0575 (1.46) 0.0453 (1.1)
16 0.0625 (1.59) 0.0635 (1.61) 0.0508 (1.29)
15 0.0703 (1.8) 0.0710 (1.80) 0.0571 (1.4)
14 0.0781 (1.98) 0.0785 (1.99) 0.0641 (1.63)
13 0.094 (2.4) 0.0934 (2.37) 0.072 (1.8)
12 0.1094 (2.78) 0.1084 (2.75) 0.0808 (2.05)
11 0.1250 (3.18) 0.1233 (3.13) 0.0907 (2.30)
10 0.1406 (3.57) 0.1382 (3.51) 0.1019 (2.59)
9 0.1563 (3.97) 0.1532 (3.89) 0.1144 (2.91)
8 0.1719 (4.37) 0.1681 (4.27) 0.1285 (3.26)

How Long Will Galvalume Last?

The service life of Al-Zn steel is about 40-60 years. Actually, it mainly depends on the thickness of the galvalume coating, as well as the use environment. When galvalume roofing is installed in the right environment, they are able to last decades.

Does Galvalume Metal Rust?

Galvalume steel has strong corrosion resistance. But galvalume steel is actually a kind of iron steel. So it will rust finally when the protective coating is broken. It often rusts from the cut edge. Because the galvalume coating is made with less zinc, the anodic protection is poor. When a certain point of the GL sheet is corroded, the rusted area will spread over the entire surface.

Can You Paint Galvalume Steel?

Of course. The galvalume coating has great adhesion, which makes it easy to paint. You can paint it with different colors for decorative or aesthetic purposes, like PPGL steel.

Galvalume Sheet Price

In comparison, the galvalume sheet price will be higher than that of GI sheets. It is because of its great properties. Besides, the number of galvalume sheet manufacturers is less. Commonly, the price starts from $ 800 per ton. And the galvalume coil price keeps rising in recent months. Please contact us for the latest price.

Wanzhi Group is one of the top galvalume sheet manufacturers in China, which has 17 years of experience in this industry. We have our own factory, advanced production line, and professional teams. We welcome your visit sincerely.

Agent Visit Factory

Agent Visit Factory

Customer Visit Our Factory

Customer Visit Our Factory


Galvalume steel is a kind of superior material, especially for roofing and wall system. It is also ideally suitable for furniture, home appliances, automobile industry. Thanks to its wide applications and good workability, the galvalume coil is great to invest in. Wanzhi Steel has galvalume coils in stock and also the monthly production can reach up to 100,000 tons to shorten the delivery period. While for end users, you can choose plain or corrugated galvalume sheets of different sizes and designs. Welcome to contact us for details!

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