What is zinc aluminum-magnesium steel coil?
Galvanized aluminum-magnesium steel is a new type of high-corrosion-resistant coated steel plate. Its coating composition is mainly zinc, composed of zinc plus 1.5%-11% aluminum, 1.5%-3% magnesium, and a small amount of silicon (the proportion of different manufacturers is slightly different). Currently, the thickness range that can be produced in China is 0.4-2.5mm; our company can supply the thickness range of 0.4mm---4.0mm and the production width range is 580mm---1500mm.
Due to the combined effect of these added elements, its corrosion-inhibiting effect is further enhanced. In addition, it has excellent processing performance under severe conditions (stretching, stamping, bending, paint welding, etc.), and the coating has high hardness and excellent damage resistance. Compared with ordinary galvanized and galvalume products, it has better corrosion resistance. Due to this super corrosion resistance, it can be used instead of stainless steel or aluminum in some fields. The corrosion-resistant self-healing function of the cut section is a significant feature of the product.
Usage of Zinc aluminum, magnesium steel coil
Zinc-aluminum-magnesium products are widely used, mainly used in civil construction (keel ceiling, perforated plate, cable tray), agriculture and livestock (steel structure of agricultural feeding shed, steel structure accessories, greenhouse, feeding equipment), railway road, power communication (transmission Power distribution high and low voltage switchgear, outer body of box-type substation), photovoltaic support, automobile motor, industrial refrigeration (cooling tower, large outdoor industrial air conditioner) and other industries, the application field.
What issues should be paid attention to when purchasing as a plus use?
Zinc-aluminum-magnesium products have a wide range of uses. Different uses require different ordering standards, such as
① passivation + oiling,
② non-passivation + oiling,
③ passivation + non-oiling,
④ non-passivation + non-oiling,
⑤Fingerprint resistance,
so in the process of small batch purchase and use, it is necessary to confirm the use scenario and surface delivery requirements with the supplier to avoid subsequent processing problems.
Composition of the substrate
| Element | Content (%) | Function |
|---|---|---|
| C | ≤ 0.12 | Ensures ductility and weldability |
| Mn | 0.20-0.60 | Improves strength and hardenability |
| Si | ≤ 0.05 | Deoxidizes, reduces inclusions |
| P/S | ≤ 0.025 | Controls contaminants, prevents brittleness |
Mechanical properties of the substrate
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 270~550 MPa | 140~350 MPa | 20%~40% | 60~120 HV |
Composition of coatings
| Elemental | content (%) | Function |
|---|---|---|
| Zn | 90-94 | Sacrificial anodic protection, dominant corrosion reaction |
| Al | 4-11 | Formation of oxide film, high-temperature resistance, and barrier protection |
| Mg | 0.2-3 | Promote self-healing, generate an Alkaline protective film |
| Si | 0.1-0.5 | Inhibits the overgrowth of Fe-Al alloy layer |
Which is Better ZAM, GI, GL?
| Indicators | GI (Galvanized) | GL (Aluminum-Zinc Plated) | ZAM (Zinc-Aluminum-Magnesium) |
|---|---|---|---|
| Salt Spray Resistance (hrs) | 200-400 (Z120) | 600-1500 (AZ150) | 1500-3000 (ZM150) |
| Cutting Corrosion Resistance | Poor (susceptible to red rust) | Medium (Aluminum Retarded Corrosion) | Superior (Self-healing) |
| Process Hardness (HV) | 70-150 | 200-300 | 250-400 |
| Cost | Low | Medium | High |
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FAQ
1.What thicknesses are available for Al-Zn-Mg steel coils?
Commonly 0.2mm to 2.0mm, depending on application.
2.Can Galvalume steel be painted?
Yes, it can be pre-painted or painted after fabrication.
3.Is Al-Zn-Mg steel suitable for roofing?
Yes, widely used for industrial, commercial, and residential roofing.
4.Can Galvalume steel be welded?
Yes, it can be welded, though surface coating may require special handling.
5.How long does Galvalume steel last outdoors?
Typically 20-30 years, depending on environmental conditions.
6.Can Al-Zn-Mg steel be bent or formed?
Yes, it has good formability for profiles, panels, and structural shapes.
7.What are common applications of Galvalume steel?
Roofing, wall panels, gutters, HVAC, automotive parts, and light steel structures.
