From the production process point of view, galvanized square tubes can be divided into hot-dip galvanized square tubes and cold-dip galvanized square tubes. There are significant differences in the physical and chemical properties of these two types of galvanized square tubes, especially in terms of strength, toughness and mechanical properties.

The production process of hot-dip galvanized square tubes includes welding after the steel plate or steel strip is curled and formed, and then the square tube is immersed in a hot-dip galvanizing pool and undergoes a series of chemical reactions. This production method is relatively simple, efficient, and has a variety of varieties and specifications, which makes it suitable for small galvanized square tube manufacturers. However, in terms of strength, hot-dip galvanized square tubes have lower strength than seamless square tubes.

On the other hand, cold-dip galvanized square tubes use cold-dip galvanizing technology to give square tubes corrosion resistance. Unlike hot-dip galvanizing, cold-dip galvanizing coatings are mainly based on electrochemical principles for corrosion protection. Therefore, it is crucial to ensure that the zinc powder is in full contact with the steel to generate an electrode potential difference, which is the key link in the production of cold-dip galvanized square tubes.

Galvanized square tubes are divided into hot-dip galvanized square tubes and cold-dip galvanized square tubes according to the production process.

Hot-dip galvanized square tubes are square tubes that are plated with a layer of zinc on the outer surface of the square tube through the hot-dip galvanizing process. The hot-dip galvanizing process involves pickling the square tube to remove surface impurities and then immersing it in the molten zinc liquid in the galvanizing pool so that the zinc liquid fully reacts with the surface of the square tube, thereby forming a uniform galvanized layer on the square tube. Its anti-corrosion performance is significantly higher than that of cold-dip galvanized square tubes. The excellent anti-corrosion performance is due to the protection of the zinc layer, which can effectively isolate the square tube from the external environment, prevent corrosion, and ensure that the square tube can maintain a long service life and good durability in various environments.

The galvanizing process of cold-dip galvanized square tubes is carried out at room temperature. This type of pipe not only has similar anti-corrosion performance to hot-dip galvanized square tubes, but also shows its unique advantages in many aspects. First of all, the production cost of cold-dip galvanized square tubes is relatively low, and the price is more competitive. Secondly, its coating is uniform and delicate, and its appearance quality is excellent, which can meet customers' requirements for beauty. The surface of cold-dip galvanized square tube is relatively smooth and bright. The electroplating layer using the white passivation process is bluish white or white, with a slightly colored luster in the sun.

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