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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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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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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Pre galvanized pipe, with galvanized strip (that is, has been galvanized steel strip) production, the raw material is galvanized strip steel.
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Galvanized strip steel is the cold rolled or hot rolled, long and narrow strip steel plate on different degrees of a layer of raw materials called (zinc, aluminum). Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Complex physical and chemical reactions occur between hot dip galvanized strip steel matrix and molten plating solution to form a tightly structured zinc-ferroalloy layer with corrosion resistance. The alloy layer is integrated with pure zinc layer and strip steel matrix. So its corrosion resistance is strong.
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