Annealed square tube is a kind of square steel tube after high temperature treatment, by heating the square tube to a certain temperature and continuous insulation for a period of time, so that its internal organization changes, to achieve softening, stress relief, improve the processing performance and other effects of the processing technology.
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It is a circular pipe made of forming, welding and hot dip galvanizing on the basis of cold rolled steel strip. The pipe is coated with zinc to improve the corrosion resistance of the pipe.
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Annealing is a process of heat treatment of metals in which the metal is slowly heated to a certain temperature, held for a sufficient time, and then cooled at a suitable rate. The purpose is to reduce the hardness and improve the machinability
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Hot dip galvanized pipe is made of molten metal and iron matrix reaction to produce alloy layer, so that the matrix and the coating of the two combination. Hot dip galvanizing is to first pickling the steel pipe. In order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned by ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium chloride and zinc chloride, and then sent into the hot dip plating tank.
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Color coated coil is hot galvanized sheet, hot aluminum plating zinc plate as the substrate, after surface pretreatment (chemical degreasing and chemical conversion treatment), coated on the surface of a layer or several layers of organic coating, then after baking and curing products.
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Galvanized strip steel is cold rolled or hot rolled, long and narrow steel plate coated with a layer of raw materials called (zinc, aluminum).
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