AZ150 Aluzinc Galvalume Steel Zinc Aluminized sheet coil Thickness
0.3 - 3.0mm Small Spangle
| Product Name | Hot Dipped Galvalume Steel Coil |
| Thickness | 0.12-8.0mm ( One of few suppliers in China who can produce thick
coils up to 8.0mm) |
| Width | Within 2000mm (Have unique strength on 1500-2000mm in China) |
| Base steel | Cold rolled/Hot rolled |
| Zinc Coating | AZ30~AZ1200 (High coating) |
| Coil Inner Diameter | 508/610mm |
| Spangle | Big/Small/Zero |
| Payment | L/C, T/T, / Alibaba Trade Assurance ( USD, EURO, RMB ) |
| Packing | Mill's standard export sea-worthy packing |
| No tricks | Never steal zinc coating, never short weight |
| High Capacity | 10,000 MT per month |
| Efficient Service | Respond your inquiry within 5 minutes |
| Professional Shipment | Very professional both in sea freight and door to door service |
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.
| 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 |
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.
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
Galvalume Steel Codes
| Chinese Code | European Code | American Code | Japanese Code |
| DC51D+AZ | DX51D+AZ | CS type B, type C | SGLCC |
| DC52D+AZ | DX52D+AZ | DS | SGLCD |
| S250GD+AZ | S250GD+AZ | 255 | – |
| S300GD+AZ | – | – | – |
| 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.
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.
