Six questions and answers about galvanized aluminum-magnesium steel plate. Below, Hengze Steel will show you what zinc-aluminum-magnesium steel plate is, as well as precautions during the processing, quality objections and other issues.
What is galvanized aluminum-magnesium steel plate?
Galvanized aluminum-magnesium steel plate is a new type of highly corrosion-resistant coated steel plate. Its coating composition is mainly zinc, with 1.5%-11% aluminum, 1.5%-3% magnesium and trace silicon (the proportions vary slightly from manufacturer to manufacturer). The current domestically produced thickness range is 0.4-2.5mm, our company can provide a thickness range of 0.4mm—4.0mm, and a producible width range of 580mm—1500mm.
Due to the combined effect of these added elements, its corrosion inhibition effect is further improved. In addition, it has excellent processing performance under severe conditions (stretching, stamping, bending, painting, welding, etc.), high coating hardness, and excellent damage resistance. Compared with ordinary galvanized and galvanized products, it has better corrosion resistance. Due to this super corrosion resistance, it can replace stainless steel or aluminum in some fields. The corrosion-resistant self-healing effect of the cut section is a major feature of the product.
What are the uses of galvanized aluminum-magnesium steel plates?
Zinc-aluminum-magnesium products are widely used, mainly in civil construction (keel ceilings, porous plates, cable trays), agricultural animal husbandry (agricultural greenhouse steel structures, steel structure accessories, greenhouses, breeding equipment), railways and roads, power communications (power transmission and distribution high and low voltage switchgear, box-type substation exteriors), photovoltaic brackets, automotive motors, industrial refrigeration (cooling towers, large outdoor industrial air conditioners) and other industries, with a very wide range of uses.
Why are there occasional black spots on the surface of zinc-aluminum-magnesium steel plates?
Zinc-aluminum-magnesium, because it is a ternary alloy and magnesium ions are relatively active, black spots are common on the surface of zinc-aluminum-magnesium products. It exists objectively and is unpredictable.
1.Large-scale production can relatively avoid the black spot problem.
2.In the process of small-scale production, it will be relatively obvious. The main reason is that the alloy zinc ingots are not given enough time to react during the heating process.
3.At present, both domestic and international galvanized aluminum-magnesium products have this problem. Whether the black spots are obvious is directly related to the comparison of the brightness of the board surfaces of various manufacturers.
What issues should customers pay attention to when purchasing?
Zinc-aluminum-magnesium products have a wide range of uses. Different uses require different ordering standards. For example:
① Passivation + oiling ② Non-passivation + oiling ③ Passivation + non-oiling ④ Non-passivation + non-oiling ⑤ Fingerprint resistance
Therefore, 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.
Why is there a difference in surface brightness between the latest purchased galvanized aluminum-magnesium steel plates and the previous inventory?
Zinc, aluminum and magnesium steel mills also adjust the brightness according to user needs. Some plate colors change from dark to light, and some change from light to dark. Therefore, there may be slight deviations in color between different manufacturers and different batches.
Is the ratio of high aluminum to high magnesium definitely the best?
High magnesium and high aluminum, the coating is brittle and relatively corrosion-resistant. The salt spray test can last up to 4000 hours, but there will be cracks when magnified under a microscope after bending, so it is suitable for flat plate use. If bending, stamping and other processing are performed during use, it is recommended to use a low aluminum and low magnesium solution, because the coating is more flexible and can last up to 3300 hours in the salt spray test, making it the most cost-effective product on the market.
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