In order to improve the corrosion resistance of the steel pipe, the general steel pipe is galvanized. The galvanized steel pipe is divided into two types: 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. Blowing oxygen welded pipe: used as a steel pipe for oxygen blowing, generally with small diameter welded steel pipe, the specifications are from 8/8-2 inch. Made of steel strips of 08, 10, 15, 20 or 195-Q235, in order to prevent corrosion, some have to be effectively aluminized.
Most of the old houses are made of galvanized pipes. Now the iron pipes for gas and heating are also galvanized pipes. The galvanized pipes are used as water pipes. After several years of use, a large amount of rust is generated in the pipes, and the yellow water flowing out is not only Contaminated sanitary ware, and mixed with bacteria that grow on the inner wall of the slick, the rust causes the heavy metal content in the water to be too high, which seriously endangers the health of the human body. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and banned galvanized pipes. The Ministry of Construction and other four ministries and commissions also issued a document clarifying that galvanized pipes will be banned from 2000. At present, galvanized pipes are rarely used in cold water pipes in new residential areas. Some districts use galvanized pipes for hot water pipes.
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