Galvanized square tubes are divided into hot-dip galvanized square tubes and cold-dip galvanized square tubes in terms of production process. It is precisely because the processing of these two galvanized square tubes is different that they have many different physical and chemical properties. In general, they have many differences in strength, toughness and mechanical properties.
Hot-dip galvanized square tube: It is a square tube made by welding after curling and forming steel plates or steel strips, and then placing the square tube in a hot-dip galvanizing pool after a series of chemical reactions. A square tube is formed. The production process of hot-dip galvanized square tubes is relatively simple, and the production efficiency is very high. There are many varieties and specifications. This kind of square tube requires very little equipment and funds, which is suitable for the production of small galvanized square tube manufacturers. However, in terms of strength, the strength of this steel pipe is far lower than that of seamless square tubes.
Cold-dip galvanized square tubes
Cold-dip galvanized square tubes use the principle of cold galvanizing on the square tubes used to make the square tubes have anti-corrosion properties. Unlike hot-dip galvanizing, cold-dip galvanizing mainly uses electrochemical principles to prevent corrosion. Therefore, it is necessary to ensure that the zinc powder is in full contact with the steel to produce an electrode potential difference, so the surface treatment of the steel is very important.
Difference between hot and cold galvanizing
Galvanized square tubes are divided into two categories: hot-dip galvanized square tubes and electro-galvanized square tubes. Hot-dip galvanized square tubes include wet method, dry method, lead-zinc method, oxidation-reduction method, etc. The main difference between different hot-dip galvanizing methods is what method is used to activate the surface of the pipe body to improve the quality of galvanizing after the steel pipe is acid-soaked and cleaned. The dry method and oxidation-reduction method are mainly used in production, and their characteristics are shown in the table. The surface of the zinc layer of electro-galvanized zinc is very smooth and dense, with uniform structure; it has good mechanical properties and corrosion resistance; the zinc consumption is 60% to 75% lower than that of hot-dip galvanizing. Electro-galvanizing has certain technical complexity, but this method must be used for single-sided coating, double-sided coating with different coating thickness on the inner and outer surfaces, and thin-walled tube galvanizing.
Uses of galvanized square tubes
Since galvanized square tubes are galvanized on square tubes, the application range of galvanized square tubes has been greatly expanded compared to square tubes. They are mainly used in curtain walls, buildings, machinery manufacturing, steel construction projects, shipbuilding, solar power generation brackets, steel structure projects, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc.
Characteristics of galvanized square tubes
Galvanizing has a stronger protective effect and strong corrosion resistance. The entire structure is made of zinc, forming a dense quaternary crystal, which forms a barrier on the steel plate, thereby effectively preventing corrosion factors from penetrating. Corrosion resistance comes from the strong barrier layer protection function of zinc. When zinc is used as sacrificial protection on the cut edges, scratches and plating scratches, zinc forms an insoluble oxide layer to play a barrier protection function.
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