<p class="ql-block"> In order to improve the corrosion resistance of the steel pipe, the general steel pipe is galvanized. Galvanized steel pipe is divided into hot dip galvanized and electric galvanized two, hot dip galvanized galvanized layer is thick, electric galvanized low cost, the surface is not very smooth. Oxygen blowing welding pipe: used for steelmaking oxygen blowing pipe, generally with small diameter welded steel pipe, specifications from 3/8-2 inches of eight. Made of 08, 10, 15, 20 or 195-Q235 steel strip, in order to prevent corrosion, some should be effectively aluminized.</p><p class="ql-block"> Most of the old houses are used with galvanized pipes, and now the kind of iron pipes used for gas and heating are also galvanized pipes. Galvanized pipes are used as water pipes. After several years of use, a large number of rust and scale are produced in the pipes, and the yellow water flowing out not only contaminizes sanitary ware, but also contains bacteria that breed on the inner wall. In the 1960s and 1970s, the developed countries in the world began to develop new types of pipes and gradually banned galvanized pipes. China's Ministry of Construction and other four ministries and commissions have also issued a document to prohibit galvanized pipes from 2000, at present, the cold water pipes in the new community have rarely used galvanized pipes, and the hot water pipes in some communities use galvanized pipes.</p>