Galvanized steel pipes are divided into cold-galvanized pipes and hot-galvanized pipes. In the purchase of galvanized steel pipe must be in the regular manufacturers, in the price comparison, can not blindly seek the price and not guarantee the quality, leaving a safety hazard.
From the detailed production process of the galvanized steel pipe, it can be clearly seen that the hot-dip galvanized pipe is an alloy layer which reacts the molten metal with the iron matrix, thereby combining the base body and the plating layer. Hot-dip galvanizing is to first pick the steel pipe for pickling. In order to remove the iron oxide on the outer surface of the steel pipe, after pickling, it is washed with ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank. Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. However, cold-galvanized strip is different. Cold-galvanizing is electro-galvanizing. The amount of galvanizing is very small. As long as it is 10-50gm2, its corrosion resistance is much worse than that of hot-dip galvanized pipe. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanized.
Therefore, cold-galvanized strip steel has been banned by the state. The reason for the ban is that the cold-galvanized strip steel does not meet the requirements in the production process and cannot reach the role it should have in its scope of use. As long as small companies with small plans and outdated equipment use electro-galvanized steel, of course, their prices are relatively cheaper. Now the Ministry of Construction has officially laid out the cold-galvanized pipes with backward skills, and the cold-galvanized pipes are used as water and gas pipes.
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