Hot dip galvanized steel pipe surface is plated layer or electric galvanized welded steel pipe.Galvanized steel pipe corrosion resistance can increase, prolong service life.Galvanized pipe USES is very wide, in addition to a general low pressure fluid such as water, gas, oil line pipe, also used as oil industry, especially the ocean oil field oil well pipe, oil pipe, chemical coking equipment of oil heater, the condensing, exchange of coal distillation wash oil cooler for tube, and trestle pile, mining tunnel supporting frame tube, etc.