Hot dip galvanized steel pipe is first pickling, in order to remove iron oxide on the surface of the steel pipe, after pickling, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank for cleaning, and then into the hot dip plating tank.
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Annealing is a metal heat treatment process in which the metal is heated to a certain temperature, kept for a sufficient time, and then cooled at a suitable rate (usually slowly or sometimes controlled).
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Galvanized C steel size adjustable, high compressive strength and other advantages. The section size of the steel formed by cold bending is light and light, and can be connected into different combinations, which is very consistent with the stress characteristics of roof purlin, so that the mechanical efficiency of the steel can be used. At the same time, it can reduce the weight of building roof and reduce the amount of steel used in engineering, so it is called economical and efficient steel.
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Steel - plastic composite pipe is a new type of pipe material. Steel-plastic composite steel pipe, the products are seamless steel pipe, welded steel pipe as the base pipe, the inner wall is coated with high adhesion, anti-corrosion, food grade sanitary polyethylene powder coating or epoxy resin coating.
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Cold rolled sheet is made of hot rolled steel strip of ordinary carbon structural steel, which is further cold rolled to make steel sheet with thickness less than 4mm. Due to rolling at room temperature, does not produce iron sheet, therefore, cold rolled plate surface quality, high dimensional accuracy, coupled with annealing treatment, its mechanical properties and technological properties are better than hot rolled thin steel plate, in many fields, especially in the field of home appliances manufacturing, has gradually replaced hot rolled thin steel plate.
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If cold rolled steel is heated to annealing temperature and the surface color turns black due to high temperature contact with air, it is called black faded steel. Its surface has not been polished so it is black. The physical properties become soft, convenient for further welding into steel pipe.
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