Changde galvanized square tube, Hunan hot-dip galvanized square tube manufacturer, Changsha galvanized square tube price

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Galvanized square tube is a kind of hot-rolled or cold-rolled galvanized strip steel or galvanized coil plate that is cold-bent. Hollow square cross-section steel pipes with square cross-section shapes and sizes are made by high-frequency welding after forming, or galvanized square rectangular pipes are made by hot-dip galvanizing the pre-made cold-formed hollow steel pipes.
Classification
Galvanized square tubes are divided into hot-dip galvanized square tubes and cold-dip galvanized square tubes in terms of production technology. It is precisely because of the differences between these two galvanized square tubes that they have many different physical and chemical properties. Generally speaking, they have many differences in strength, toughness and mechanical properties.
<3>Hot-dip galvanized square tube
Hot-dip galvanized square tube: It is a square tube made by welding steel plate or steel strip after curling and forming, and in this square tube A square tube is formed by placing the square tube in a hot-dip galvanizing bath and undergoing a series of chemical reactions. The production process of hot-dip galvanized square tubes is relatively simple, the production efficiency is very high, and there are many varieties and specifications. This kind of square tubes requires very little equipment and funds, and 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 pipes.
<3>Cold-dip galvanized square tube
Cold-dip galvanized square tube uses the principle of cold galvanizing on the square tube used to make the square tube anti-corrosion. Different from hot-dip galvanizing, cold-dip galvanizing coating mainly uses electrochemical principles for anti-corrosion. Therefore, it is necessary to ensure full contact between zinc powder and steel to generate an electrode potential difference, so surface treatment of steel is very important.
<3>The 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 pipes include wet method, dry method, lead-zinc method, redox method, etc. The main difference between different hot-dip galvanizing methods is the method used to activate the surface of the pipe body to improve the galvanizing quality after acid leaching cleaning of the steel pipe. Dry method and redox method are mainly used in current production, and their characteristics are shown in the table. The surface of the electro-galvanized zinc layer is very smooth and dense, with a uniform structure and good mechanical properties and corrosion resistance. The zinc consumption is lower than that of hot-dip galvanizing. Electro-galvanizing is technically complex, but this method must be used for single-sided coatings, double-sided coatings with different coating thicknesses on the inner and outer surfaces, and thin-walled pipe galvanizing.