The main difference between different hot-dip galvanizing methods is to activate the surface of the tube to improve the quality of the galvanizing after the steel tube is washed by acid leaching. Dry process and oxidation-reduction method are mainly used in current production. The galvanized steel pipe has two major categories: hot galvanizing and galvanizing. Hot galvanizing has wet process, dry process, lead and zinc method, oxidation reduction method and so on, and its process flow.
The galvanized zinc coating of galvanized steel pipe is very smooth and compact, with uniform structure. It has good mechanical properties and corrosion resistance. Zinc consumption is 60% to 75% lower than that of hot dip galvanizing. Zinc plating is technically complex, but this method must be applied to one side coating, double sided coating with different thickness on the inside and outside surface, and thin wall tube galvanization.
The advantages of galvanized steel pipe are good temperature and pressure resistance function, wide application, good rigidity, suitable for open loading, raw material is easy to acquire, processing skills are more sophisticated, and petrochemical technology is not sophisticated, which has always been used, so the device skills are relatively sophisticated.
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