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 Galvanized pipe used In order to improve the corrosion resistance of steel pipe, galvanized steel pipe have commonly. Galvanization steel tube hot dip galvanized and electro galvanized, hot dip galvanized zinc layer thickness, electrical galvanized the cost is low, the surface is not very smooth. Oxygen tube welding: used for steelmaking oxygen pipe, generally with small diameter welding pipe, specifications by 3/8-2 inch eight. With 8, 10, 15, 20, or 195 - Q235 steel strip production, in order to anti-corrosion, some for aluminized processing. Old houses most of the use of galvanized pipe, gas, heating, now using the iron pipe and galvanized pipe, galvanized pipe as the pipe, using a few years later, the tube to produce large amounts of rust scale, flow of sanitary wares, including not only pollution and mixed with smooth inner wall not breed bacteria, heavy metal corrosion caused by the water content is too high, cause serious damage to the health of human body. Sixties and seventies, international developed countries began to develop new pipe material, and disable the galvanized pipe. China ministry of construction and other four ministries and commissions also issued a clear from bas