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Types of Steel Pipes: Hot-dip galvanized steel pipe: Hot-dip galvanized steel pipe is used to prevent damage to the wire or its insulation, as well as to protect the external elements against unwanted contact with the conductor. Cold Galvanized Steel Pipe: Cold galvanized steel pipe is used to prevent damage to the wire or its insulation, as well as to protect the external elements against unwanted contact with the conductor. The 21 Mansourian Galvanized Pipe is one of the types of steel electric pipes that b Due to their high resistance and high resistance, they have become very popular in the construction industry. The main applications of these pipes are power lines, telephones, internet etc. and can protect electrical appliances against various damages. The 21mm cross section is available in two types of hot and cold galvanizing, and their differences are in the plating method and whether or not they are stainless.