Products Description
DC51D+AZ Galvalume Steel Sheet is the industry standard for high-performance building materials, offering up to 4 to 6 times the corrosion resistance of traditional galvanized steel. By combining the sacrificial protection of zinc with the barrier protection of aluminum, this "55% Al-Zn" alloy coating ensures your projects withstand the harshest environments for decades.
At GNEE STEEL, we manufacture DC51D+AZ sheets that meet rigorous international standards, providing a perfect blend of thermal reflectivity, formability, and aesthetic appeal with its signature uniform "spangle" finish.
Why Choose DC51D+AZ Galvalume Steel?
Superior Corrosion Resistance: The unique microscopic structure of the Al-Zn coating creates a dense barrier that prevents oxidative penetration.
Heat Reflectivity: Galvalume reflects a significant portion of solar radiation, reducing indoor temperatures and energy costs.
High-Temperature Oxidation Resistance: Unlike galvanized steel, DC51D+AZ can withstand temperatures up to 315°C without discoloration or scaling.
Excellent Paintability: The surface chemistry provides superior adhesion for color-coated applications (PPGL).
Technical Specifications & Grade Details
To ensure the highest quality for your infrastructure or manufacturing needs, we adhere to the following technical parameters:
| Parameter | Specification Details |
| Base Material | DC51D (Stamping Grade/Commercial Quality) |
| Coating Composition | 55% Aluminum, 43.4% Zinc, 1.6% Silicon |
| Coating Mass | AZ30 to AZ150 (g/m2) |
| Surface Treatment | Anti-fingerprint (AFP), Chromated, Oiled, or Dry |
| Thickness Range | 0.12mm – 2.0mm |
| Width Range | 600mm – 1500mm |
| Surface Finish | Regular Spangle / Small Spangle |
| Standards | EN 10346, ASTM A792, JIS G3321 |
DC51D+AZ steel sheet Chemical composition
|
|
Chemical composition % |
|||||||
|
C |
Si |
Mn |
P |
S |
Alt |
Ti |
Nb |
|
|
DC51D+AZ |
0.10 |
--- |
0.5 |
0.035 |
0.035 |
--- |
--- |
--- |
DC51D+AZ steel plate mechanical property
|
|
Tensile Strength |
Yield Strength |
n90 |
r90 |
Elongation% min |
The coating adhesion |
|||
|
min |
min |
<0.7mm |
>0.7mm |
<140/140 |
>140/140-175/175 |
>175/175 |
|||
|
DC51D+AZ |
270-550 |
- |
- |
- |
20 |
22 |
0a |
1a |
2a |
a . means when the thickness is more than 1.5mm, the minimum value r90 can lower 0.2.
b . means when the thickness not more than 0.7mm, the minimum value r90 can lower 0.2, n90 can lower 0.01.
c . means For difference thickness of coating products, thick coating surface as the outer surface of the bending test.
Core Applications of DC51D+AZ Steel
Construction: Roofing, wall cladding, pre-engineered buildings (PEB), and structural decking.
Appliances: Oven liners, refrigerator back panels, and microwave components.
Automotive: Exhaust systems, heat shields, and under-body components.
Infrastructure: Drainage pipes, highway fences, and industrial ventilation systems.
Galvalume steel grades and properties
| grades | Yield strength/Mpa | Tensile strength/Mpa | Elongation at break/% |
| DX51D+AZ | ≤360 | ≤440 | 192PCS |
| DX52D+AZ | ≤260 | 300-360 | 180PCS |
| DX53D+AZ | ≤200 | 270-320 | 144PCS |
| DX54D+AZ | ≤180 | 270-310 | 108PCS |
| S250GD+AZ | ≥250 | ≥330 | 108PCS |
| S350GD+AZ | ≥350 | ≥420 | |
| S450GD+AZ | ≥450 | ≥510 | |
| S550GD+AZ | ≥550 | ≥560 | |
| LG550GD+AZ | ≥550 | ≥560 |
Frequently Asked Questions (FAQ)
1. What does "DC51D+AZ" specifically mean?
"DC51D" refers to the base metal grade (low carbon steel for cold forming), while "+AZ" indicates the hot-dip aluminum-zinc alloy coating.
2. How long does Galvalume steel last compared to Galvanized?
Under identical environmental conditions, Galvalume typically lasts 2 to 4 times longer than galvanized steel with the same coating thickness due to its superior barrier protection.
3. Can DC51D+AZ be used in coastal environments?
Yes, it is highly effective in marine environments; however, we recommend a higher coating mass (e.g., AZ150) and potentially an anti-fingerprint coating for maximum longevity.
4. Is Galvalume steel sheet weldable?
Yes, it can be welded using standard methods, though parameters must be adjusted to account for the Al-Zn coating to ensure strong joints and maintain corrosion resistance.
5. Does GNEE STEEL provide customized sizes?
Absolutely. We offer precision slitting and cutting services to provide coils or sheets in the exact widths and lengths your project requires.
6. What is the benefit of the "Anti-fingerprint" (AFP) treatment?
AFP treatment prevents staining during handling, enhances corrosion resistance during storage, and acts as a primer for subsequent painting.
7. Can I paint directly onto DC51D+AZ Galvalume?
Yes, the surface is ideal for painting. Because of its excellent adhesion, it is the preferred base material for Pre-Painted Galvalume (PPGL).
8. How do you ensure the quality of the Al-Zn coating?
We conduct rigorous testing, including coating mass tests, T-bend tests, and salt spray tests, ensuring every batch meets international EN and ASTM standards.
Contact our technical sales team today for a custom quote and a full material data sheet.
[Click Here to Request a Quote] or email us directly to discuss your specific requirements!
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