As a basic material widely used in the industrial field, the selection of galvanized coils needs to comprehensively consider the three key factors of thickness, zinc layer weight and anti-corrosion performance. Reasonable selection can not only meet the use needs, but also effectively control costs. Let's analyze in detail how to choose the most suitable galvanized coil products from these three dimensions.
1. Thickness selection: the key to matching the use scenario
The thickness selection of galvanized coils must first consider the load-bearing requirements and processing requirements of the actual application scenario. The common thickness range can be roughly divided into three categories: 0.2-0.5mm thin plates are suitable for light uses such as home appliance housings and ventilation ducts. This type of product has good processing performance and low cost; 0.5-1.2mm medium-thick products are ideal for applications such as building roofs, walls and cable trays, and have achieved a good balance between strength and cost; thick plates above 1.2mm are mainly used in heavy scenes such as steel structure frames and industrial equipment. Although the price is high, the durability is excellent.
When choosing thickness, you need to pay special attention to two key points: although too thin plates save costs, they may not meet the strength requirements; and although too thick products are strong, they will increase the difficulty of processing and are prone to cracking of the zinc layer when bending. Therefore, it is recommended to choose a thickness specification that just meets the requirements according to the actual load-bearing requirements.
2. Zinc layer weight: the core indicator that determines the service life
The zinc layer weight is the most critical parameter affecting the anti-corrosion performance of galvanized coils, usually expressed in grams per square meter (g/m²). The marking methods of different standards are different: G60 in the American standard ASTM A653 indicates a single-sided zinc layer weight of 60g/m², and Z120 in the European standard EN 10346 indicates a double-sided total zinc layer weight of 120g/m². Generally speaking, G60 products are suitable for ordinary indoor environments and can be used for 10-15 years; G90 or Z120 products are more suitable for high humidity environments and can last for 15-25 years; in strong corrosive environments such as coastal areas or industrial areas, it is recommended to choose Z275 with a thicker zinc layer or switch to galvanized products.
It is worth noting that the weight of the zinc layer is not the greater the better. Although an overly thick zinc layer can extend the service life, it will increase the cost and may affect the subsequent processing performance. Therefore, it is necessary to select the appropriate zinc layer specifications according to the degree of corrosion in the use environment.
<!--[if !supportLists]-->3. <!--[endif]-->other important factors affecting anti-corrosion performance
In addition to the weight of the zinc layer, the galvanizing process and the substrate material will also affect the performance of the final product. Hot-dip galvanized products have a thicker zinc layer and excellent anti-corrosion performance, which are suitable for outdoor use; although the zinc layer of electroplated galvanized products is thinner, the surface is smoother and flatter, which is suitable for home appliances and other fields that require precision processing. In terms of surface treatment, conventional zinc flower products are beautiful but may affect subsequent spraying, while non-zinc flower products are more suitable for occasions that require secondary processing.
The choice of substrate material is equally important. Low-carbon steel substrates are low-cost, easy to process, and suitable for most general purposes; while high-strength steel substrates are stronger, they require a special galvanizing process to ensure the adhesion of the zinc layer. In addition, when purchasing, you should also pay attention to the implementation standards of the product to ensure that it meets the quality specifications required by the project.
4. selection suggestions and precautions
When actually purchasing, it is recommended to first clarify the use environment and performance requirements. For ordinary dry environments, choose medium-thick products with specifications of G60 or Z120; for humid or rainy areas, specifications of G90 or above are required; for highly corrosive environments, consider Z275 or aluminum-zinc-plated products. At the same time, confirm the required surface treatment type, and choose zinc-free products for subsequent processing.
In addition, it is recommended to give priority to products from well-known brands and require suppliers to provide complete quality certification documents. During acceptance, focus on checking the uniformity and surface quality of the zinc layer. If necessary, a salt spray test can be performed to verify the anti-corrosion performance. When storing, pay attention to keeping it dry and ventilated to avoid early rust due to moisture.
Through such a systematic selection method, we can control costs while purchasing the galvanized coil products that best suit the project needs to ensure the quality and service life of the project.