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what's the use of Hot dip Galavanized steel pipe

Views: 0     Author: Site Editor     Publish Time: 2022-04-12      Origin: Site

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Application of hot-dip galvanized steel pipe: mainly used for conveying gas and heating.


In gas, greenhouse and heating, the kind of iron pipe is also galvanized pipe. As a water pipe, galvanized pipe produces a lot of rust and scale in the pipe. The yellow water not only pollutes the sanitary ware, but also mixed with bacteria breeding on the unsmooth inner wall. Corrosion causes the content of heavy metals in the water to be too high, which seriously endangers human health. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and successively banned galvanized pipes. China's Ministry of construction and other four ministries and commissions have also made it clear that galvanized pipes have been banned since 2000. At present, galvanized pipes are rarely used in cold water pipes in new residential areas, and galvanized pipes are used in hot water pipes in some residential areas.


Hot dip galvanized pipe: in order to improve the corrosion resistance of steel pipes, general steel pipes are galvanized. Galvanized steel pipes are divided into hot-dip galvanizing and electro galvanizing. The hot-dip galvanizing layer is thick, the cost of electro galvanizing is low, and the surface is not very smooth.


Hot dip galvanized pipe is to make molten metal react with iron matrix to produce alloy layer, so as to combine the matrix and coating. Hot dip galvanizing is to pickle the steel pipe first. In order to remove iron oxide on the surface of the steel pipe, after pickling, it is cleaned in ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank, and then sent to the hot dip galvanizing tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Complex physical and chemical reactions take place between the steel pipe matrix and the molten plating solution to form a corrosion-resistant zinc ferroalloy layer with compact structure. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. Therefore, it has strong corrosion resistance.


1. Uniformity of zinc coating: the steel pipe sample shall be immersed in copper sulfate solution for 5 times without turning red (copper plating color)


2. Surface quality: the surface of galvanized steel pipe shall have a complete galvanized layer, without black spots and bubbles, and small rough surfaces and local zinc nodules are allowed.


3. Weight of galvanized layer: according to the requirements of the demander, the weight of galvanized steel pipe can be measured, and its average value shall not be less than 500g / m2, and any sample shall not be less than 480g / m2.


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