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China galvanized steel pipe Purchasing Customized

China galvanized steel pipe Purchasing Customized

Difference between hot and cold galvanized steel pipe


There are two types of galvanized square pipes: hot-dip galvanized square pipes and galvanized square pipes. Hot-dip galvanized square tubes include wet method, dry method, lead-zinc method, and redox method. The main difference between different hot-dip galvanizing methods is how to activate the surface of the pipe body to improve the quality of galvanizing after acid-leaching cleaning of the steel pipe. Currently, the dry method and the redox method are mainly used in production, and their characteristics are shown in the table.


The surface of the galvanized zinc layer is very smooth and dense, and the structure is uniform; it has good mechanical properties and corrosion resistance; the zinc consumption is 60% to 75% lower than that of hot-dip galvanizing. Electrogalvanizing is technically complicated, but this method must be used for single-sided coatings, double-sided coatings with different thicknesses on the inner and outer surface, and thin-walled zinc plating.


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