The drainage pipe is made of special shaped steel and plastic composite strip by spiral winding welding (extrusion welding on the lap surface), and its inner wall is smooth and flat.
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Cold rolled steel is steel produced by cold rolling. Cold rolling is the further rolling of No.1 steel plate to the desired thickness at room temperature
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Annealing is a metal heat treatment process in which the metal is slowly heated to a certain temperature, maintained for a sufficient time, and then cooled at a suitable rate.
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Galvanized steel plate is to prevent corrosion on the surface of the steel plate to prolong its service life, coated with a layer of metal zinc on the surface of the steel plate, the zinc coated steel plate is called galvanized plate.
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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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Galvanized coil, dip a sheet steel plate into a melted zinc tank, so that the surface adhesion of a zinc sheet steel.
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