Aluminum-Zinc Alloy Coated Galvalume Steel Coil Sheet
Steel sheets coated with an aluminum-zinc alloy layer-typically by a hot-dip method-are known as aluminized zinc coils. This coating combines the sacrificial corrosion protection of zinc with the barrier protection of aluminum. As a result, the steel outperforms many conventional coated materials used in industrial applications in terms of durability, heat resistance, and corrosion resistance.
- Product Specifications
| Product Specifications | |||
|
Plating composition |
Plating thickness |
Product thickness |
Product width |
|
55% aluminum 43.5% zinc 1.5% silicon |
AZ30-AZ220 |
0.15–1.60mm |
700–1260mm |
- Product Warranty
| Product Warranty | ||
|
The amount of aluminum-zinc plating AZ150
Warranty period 20 years |
The amount of aluminum-zinc plating AZ180
Warranty period 25 years |
The amount of aluminum-zinc plating AZ200+
Warranty period 30 years |
Request Latest Steel Price Today
Features Of Galvalume Steel Coil Sheet
1.Plating composition
55% aluminum, 43.5%, zinc,1.5% silicon and other trace elements.
2.Corrosion resistance mechanism
It combines the physicalprotection and high durabilityof Al and the electrochemicalprotection of Zn, as well as theaddition of a variety of traceelements, and has excellentresistance to atmospheric
3.Corrosion resistance
In a neutral environment, thecorrosion resistance is 2-4times that of galvanized sheet with the same coating thickness corrosion.
Advantages Of Galvalume Steel Coil Sheet
Small dendrites space distance
Dendrite spacing is an important factor in measuring the corrosion-resistance of the coated products. The smaller the dendrite spacing, the better the corrosion resistance of the coating layers. If the dendrite spacing of galvalume steel is greater than 20μm, the corrosion resistance of the product is poor.
With unique formula of the coating and control of coating thickness, the dendrite spacing of galvalume steel is 10-15μm under electron microscopy, and the corrosion resistance of the product is excellent.
Ideal coating structure
The coating structure of GNEE STEEL's products is a staggered skeleton, which has good density and can prevent the intrusion of rainwater and other corrosive media, and that is why the product has good corrosion resistance.
If the coating structure is bamboo-like, which means the coating layer is not dense enough and the corrosion resistance can be poor.
Small-sized and uniform spangle
The stability of crystallization determines the size and uniformity of spangles. The spangles are precisely controlled under the combined effects of the steel strip temperature, zinc liquid temperature, surface roughness, post-plating cooling, and special coating formula.
The diameter of the spangle of GNEE STEEL's galvalume is controlled between 0.5-3mm, which means the spangles are small-sized and uniform, and the appearance effect is more stable.
Chromate/Passivation+AFP
We adopt double-coating and baking process for post-treatment, which means we first to passivate, dry and cool the sheets, next to apply AFP coating on the sheets and dry and cool. The AFP film is thicker and cured better, so the processing lubricity is relatively better.
Aluzinc Coils – Specification
GNEE STEEL as a professional aluzinc coils factory supplier, produces a wide range of metal coils with various specifications and material grades, coating thicknesses and surface qualities.
|
Type |
Galvalume Steel |
|---|
| Thickness | 0.15-6 mm |
| Width | 600-1250 mm |
| Packing Weight | 5-10t, customize |
| Aluzinc Coating | AZ20-AZ150 g/m2, 40-150 micron. |
| Surface Finish | oiled, chrome plated, anti-fingerprint, lacquered, etc. |
| Quality | SGS, ISO, support third-party organization testing |
Material Grade
| Grade | Yield strength (MPa) | Elongation (%) |
| DX51D+AZ | 140-280 | ≥22 |
| S250GD+AZ | 250-330 | ≥18 |
| S350GD+AZ | 340-420 | ≥14 |
| HX380LAD+AZ | 380-480 | ≥16 |
Physical Property
|
Parameter |
Value |
| Density | 3.75 g/cm³ |
| Thermal Reflectivity (300nm) | 85% |
| Coefficient of Thermal Expansion | 22×10⁻⁶ /K |
| Continuous Operating Temperature | 600°C |
Mechanical Properties
| Parameter | Standard Value |
| Yield Strength (Rp0.2) | ≥350 MPa |
| Tensile Strength (Rm) | 420-520 MPa |
| Elongation (A80mm) | ≥14% |
| Bending Performance (180°) | d=0a qualified |
International Standards
| Standard System | Coating Standard | Substrate Standard |
| Europe | EN 10346 | EN 10143 |
| North America | ASTM A792/A792M | ASTM A653 |
| Japan | JIS G3321 | JIS G3302 |
| China | GB/T 14978 | GB/T 2518 |
| International | ISO 14788 | ISO 3574 |
Aluzinc Solutions
Construction steel: We provide different solutions for durability, insulation and aesthetics of aluzinc sheet for roofing, walling, piping and other construction areas, as well as upgraded sheet painted steel solutions for different climatic conditions.
Industrial steel: Our aluzinc steel for the automotive, home appliance, and machinery manufacturing industries focuses on high strength, light weight, and processability, and we can change the substrate material and improve the thickness of the plate according to the needs of the application.
Raw material processing: We also provide steel raw materials for various processing plants, including cold rolled coils, hot rolled coils, galvalume steel coils, galvanized coils, and so on.
FAQ
1.Can Galvalume steel be used in coastal areas?
Yes, it is ideal for coastal environments due to excellent corrosion resistance.
2.What thicknesses are available for Al-Zn-Mg steel coils?
Commonly 0.2mm to 2.0mm, depending on application.
3.Can Galvalume steel be painted?
Yes, it can be pre-painted or painted after fabrication.
4.Is Al-Zn-Mg steel suitable for roofing?
Yes, widely used for industrial, commercial, and residential roofing.
5.Can Galvalume steel be welded?
Yes, it can be welded, though surface coating may require special handling.
6.How long does Galvalume steel last outdoors?
Typically 20-30 years, depending on environmental conditions.
7.Can Al-Zn-Mg steel be bent or formed?
Yes, it has good formability for profiles, panels, and structural shapes.
8.What are common applications of Galvalume steel?
Roofing, wall panels, gutters, HVAC, automotive parts, and light steel structures.
