Introduction of cold galvanized interlock pipe and hot galvanized interlock pipe

The galvanized interlock pipe is divided into cold galvanized interlock pipe and hot galvanized interlock pipe. The cold galvanized interlock pipe has been banned, and the latter is also recommended by the state to be used temporarily. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and gradually banned galvanized interlock pipes. Four ministries and commissions including the Ministry of Construction of China also issued a document to ban galvanized interlock pipes as water supply pipes since 2000. Galvanized interlock pipes are rarely used for cold water pipes in newly built communities, and galvanized interlock pipes are used for hot water pipes in some communities. The hot galvanized interlock pipe has a wide range of applications in fire fighting, electric power, and highways. Next, let us take a look at the introduction of cold galvanized interlock pipe and hot galvanized interlock pipe. Here are some answers.

Here is the content list:

l Introduction of hot galvanized interlock pipe.

l Introduction of cold galvanized interlock pipe.

Introduction of hot galvanized interlock pipe.

The hot-dip galvanized interlocking pipe makes the molten metal react with the iron matrix to form an alloy layer, and the matrix and the coating are combined. Hot-dip galvanizing involves pickling the steel pipe first. To remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned in the tank with an aqueous solution of ammonium chloride or zinc chloride or a mixed aqueous solution of ammonium chloride and zinc chloride and then sent to the high-temperature immersion electroplating tank. Hot-dip galvanized interlocking pipe has the advantages of uniform coating, strong adhesion, and long service life. The matrix of the hot-dip galvanized interlocking pipe undergoes a complex physical and chemical reaction with the molten plating solution to form a dense, corrosion-resistant zinc-iron alloy layer.

Introduction of cold galvanized interlock pipe.

Cold galvanized interlock pipe is electro-galvanized, and the amount of galvanization is very small, only 10-50g/m2. Its corrosion resistance is much different than that of a hot galvanized interlock pipe. Formal galvanized interlock pipe manufacturers, to ensure quality, most of them do not use electro-galvanization (cold plating). Only those small enterprises with small-scale and outdated equipment use electro-galvanization, and of course, their prices are relatively cheaper. The Ministry of Construction has officially announced that cold galvanized interlock pipes with backward technology should be eliminated, and cold galvanized interlock pipes are not allowed to be used as water and gas pipes. The galvanized layer of cold galvanized interlock pipe is electroplated, and the zinc layer is layered independently of the steel pipe substrate. The zinc layer simply adheres to the steel pipe substrate. Because the zinc layer is very thin, it is easy to fall off. Therefore, its corrosion resistance is poor. In new houses, it is prohibited to use cold galvanized interlocking pipes as water pipes.

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