With the expansion of urbanization, there is no doubt that the requirement for various steel products, like the galvanized steel pipe would be increased among every kind of engineering project. Shopping for galvanized steel pipe from manufacturer would be increased too. Galvanized steel pipe, with steel grade q195, q215, q235, q345, s235jr, s275jr, stk400, stk500 in threewaysteel, is for size of 21.3 - 610mm out diameter. All pipes have been hot dipped in a zinc rich galvanizing process. Of course, there are three types of the galvanized steel pipe including pre-painted (zinc: 60-120g/m2); hot-dipped galvanized steel pipe (zinc: 120-500g/m2) and cold-dipped galvanized steel pipe (zinc:10-50g/m2). Why it is an option for customers galvanized pipes are a lower cost alternative to stainless steel to achieve rust free protection once they have the helper of the zinc. Of course, maintaining comparable strength with a durable surface coating would be good for the corrosion resistance.