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The process where steel is coated with protective corrosion resistant zinc is known as galvanization. The coating formed by the zinc protects the steel from corrosion. Please note that the galvanizing does not change the mechanical properties of steel. Hot dipped galvanized steel pipe: The hot dipped galvanized process is where an already formed part, for example round pipe, square or rectangular tube is dipped in a zinc bath. A reaction takes place between the steel and the zinc during the time the steel part is in the zinc bath. The thickness of the zinc coating is influenced by a number of factors, including the surface of the steel, the time the steel is dipped in the bath, the composition of the steel as well as the steel's size and thickness. One advantage of hot dip galvanizing is that the entire part is covered including the edges, welds, etc. giving it an all-round corrosion protection. The end product can be used outdoors in all different weather conditions. It is the most popular galvanizing method and is widely used in the construction industry. Pre-galvanized steel pipes: Pre-galvanized steel refers to steel which was galvanized while in sheet format, thus prior to further manufacturing. Pre-galvanization is also known as mill galvanized, due to the fact that the steel sheet is rolled through molten zinc. After the sheet is sent through the mill to be galvanized it is cut to size and recoiled. A specific thickness is applied to the entire sheet, for example pre-galvanized Z275 steel has a 275g per square meter zinc coating. One of the advantages which pre-galvanized steel has over hot dip galvanized steel is that it has a better appearance. pre-galvanized materials are used for a wide variety of products including conduit, lip and open channels.