Description

Galvanized coil, full name hot-dip galvanized steel coil, is a steel product with good corrosion resistance. It is made of hot-rolled or cold-rolled steel plate as the substrate. After continuous hot-dip galvanizing process, a zinc layer is formed on the surface of the steel plate, so as to obtain a steel product with good corrosion resistance. Its surface presents a silvery white metallic luster, the zinc layer is uniform and dense, the appearance is flat and smooth, and there are no obvious zinc flower defects, scratches, indentations and other surface quality problems. According to the production process and the amount of zinc layer adhesion, galvanized coils can be divided into hot-dip galvanized coils and electro-galvanized coils.

Parameters

 Applications​

Construction industry: It is one of the most widely used materials in the construction industry and can be used to manufacture roof panels, wall panels, ventilation ducts, rainwater pipes, steel structures, etc. The good corrosion resistance and strength of galvanized coils can ensure that buildings are not easy to rust and damage during long-term use, extending the service life of buildings. ​

Home appliance manufacturing: In the field of home appliance manufacturing, galvanized coils are often used to produce the outer shells and internal structural parts of home appliances such as refrigerators, air conditioners, washing machines, and microwave ovens. Its beautiful surface and strong corrosion resistance can not only improve the appearance quality of home appliance products, but also protect internal components from corrosion. ​

Automobile manufacturing: In automobile manufacturing, galvanized coils are used to manufacture body panels, chassis components, fuel tanks, etc. By using galvanized coils, the corrosion resistance of automobiles can be effectively improved, the maintenance cost of automobiles during use can be reduced, and the strength and safety of the car body can be enhanced. ​

Light industry: In the field of light industry, galvanized coils can be used to make furniture, shelves, office equipment, hardware products, etc. Its good processing performance and decorative properties make the products both practical and beautiful. ​

Agriculture: In agriculture, galvanized coils can be used to build greenhouses, livestock and poultry breeding houses, granaries and other facilities, which can withstand harsh environments and provide a good growth environment for crops and livestock. ​

Performance

Corrosion resistance: This is the most outstanding performance of galvanized coils. The zinc layer reacts with oxygen, carbon dioxide and moisture in the air in the atmospheric environment to form a dense basic zinc carbonate protective film, which prevents the steel plate substrate from being further corroded, thereby significantly improving the corrosion resistance of the steel and extending its service life. ​

Processing performance: Galvanized coils have good formability and can be made into parts of various shapes and sizes through various processing methods such as stamping, bending, shearing, and welding. The material and performance of its substrate determine the difficulty of processing and the quality of the final product.​

Decorative performance: The surface of the galvanized coil is flat and smooth. After proper treatment (such as passivation, oiling, color coating, etc.), it can present different colors and gloss, has good decorative effect, and can meet the needs of different users for product appearance. ​

Economical efficiency: Although the price of galvanized coil is higher than that of ordinary steel plates, due to its excellent corrosion resistance and long service life, it can reduce maintenance and replacement costs during long-term use, and has a high cost performance. ​

V. Packaging description ​

Inner packaging: Generally, moisture-proof paper, plastic film and other materials are used to wrap the galvanized coil to prevent the surface from being scratched, damp and rusted during transportation and storage. For some special uses or galvanized coils with high surface quality requirements, anti-rust paper or anti-rust oil will be added to the moisture-proof paper or plastic film to further enhance the anti-rust effect. ​

Package

For galvanized products, we have three layers of waterproof packaging.

1. Waterproof thick plastic paper is used inside to prevent water ingress.

2. The second layer is packed with thick kraft paper, which is waterproof and prevents surface scratches, further enhancing the anti-rust effect.

3. Thick iron sheet packaging is used outside, which not only protects the steel coils in depth, but also plays a wear-resistant role. We use special full-wrapped corner guards for the corners. It can effectively prevent the steel coils from being collided and damaged during transportation and loading and unloading.

Custom concerns：

Q: What is the relationship between the zinc layer thickness and corrosion resistance of galvanized coils? ​

A **: The zinc layer thickness is positively correlated with corrosion resistance. The thicker the zinc layer, the thicker the protective film formed, the stronger the protective effect on the steel plate substrate, and the longer the corrosion resistance of the galvanized coil under the same use environment. However, as the thickness of the zinc layer increases, the cost will also increase accordingly. Therefore, it is necessary to reasonably select the zinc layer thickness according to the actual use environment and requirements. ​

Q: What issues should be paid attention to during the welding process of galvanized coils? ​

A **: When welding galvanized coils, due to the presence of the zinc layer, welding defects such as pores and spatter may occur. Therefore, before welding, the zinc layer of the welding part needs to be polished to remove part of the zinc layer to reduce the occurrence of welding defects. At the same time, it is necessary to select appropriate welding materials and welding process parameters, such as using welding methods such as argon arc welding, and control parameters such as welding current, voltage and welding speed to ensure welding quality.

Q: What are the requirements for the storage conditions of galvanized coils? ​

A **: Galvanized coils should be stored in a dry and well-ventilated warehouse to avoid open-air storage. The warehouse floor should be kept dry to avoid water accumulation. When stacking galvanized coils, they should avoid direct contact with the ground. Timbers or pallets can be used to raise the steel coils to prevent the bottom from getting damp and rusting. At the same time, the steel coils should be prevented from being subjected to heavy pressure and collision. The stacking height should not be too high, generally not more than 3 layers. ​

Q: Will the slight zinc flower defect on the surface of the galvanized coil affect its use? ​

A **: Slight zinc flower defects usually do not have a significant impact on the performance of the galvanized coil, especially in some application areas that do not require high surface appearance, such as building structures, general hardware products, etc., and can still be used normally. However, if the surface quality requirements are high, such as home appliance shells, decorative panels, etc., you may need to choose galvanized coil products with uniform zinc flowers and better surface quality. ​

The above covers the details of many aspects of galvanized coils. If you still have questions about some parts, or want to know more about specific application scenarios, please feel free to tell me