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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