In order to improve the corrosion resistance of the steel pipe, galvanized steel pipe for general. Galvanized steel hot galvanized and electro-galvanized two, hot dip galvanized galvanized thickness, low cost galvanized surface is not very smooth. Oxygen pipe: steel used for blowing tube, usually with a small diameter welded steel pipe specifications by 3 / 8-2 inch eight. With 08,10,15,20 or 195-Q235 strip made into, in order to prevent corrosion, and some to be an effective treatment aluminized. Most are old house with galvanized pipe, and now gas, heating with the kind of iron pipe is galvanized pipe, galvanized pipe as the water pipes, the use of a few years, a large amount of rust inside the tube, not only out of the yellow water Pollution ware, and mixed with non-smooth inner wall of breeding bacteria, corrosion caused by heavy metal content in the water is too high, serious harm to human health. Sixties and seventies, the international developed countries have started to develop new pipe, galvanized pipe and gradually disable. Chinese Ministry of Construction and other four ministries also issued a document explicitly disabled galvanized pipe from 2000 onwards, the new district currently has rarely used the cold water pipe galvanized pipe, and some residential hot water pipes using a galvanized pipe. [1]