Galvanized steel pipes are divided into two categories - hot galvanized steel pipes and cold galvanized steel pipes. Cold galvanized steel pipes are electro-galvanized steel pipes. The content of zinc is very small, only about 10g to 20g per square meter, and its corrosion resistance is not as good as hot-dip galvanized steel pipes; The corrosion resistance of hot-dip galvanized steel pipe is better than that of cold-dip galvanized steel pipe. In addition, what are the differences between the two? Let's take a look at the specific differences between them.



The difference between hot galvanized steel pipe and cold galvanized steel pipe



First: there are great differences between the two in the way of operation. The zinc used in hot galvanizing is obtained at the temperature of 450 ℃ to 480 ℃; The zinc in cold galvanized steel pipe is obtained through an electroplating process at room temperature.

BS1387 Hot Galvanized Steel Pipe supplier

Second: there is a great difference in the thickness of zinc coating between cold galvanized pipe and hot galvanized pipe. The thickness of zinc in hot galvanized steel pipe is greater than that in cold galvanized steel pipe.



Third: galvanized steel pipes are divided into two categories - hot galvanized steel pipes and cold galvanized steel pipes. Cold galvanized steel pipes are electro-galvanized steel pipes. The content of zinc is very small, only about 10g to 20g per square meter, and its corrosion resistance is not as good as hot-dip galvanized steel pipes; The corrosion resistance of hot-dip galvanized steel pipe is better than that of cold-dip galvanized steel pipe. In addition, what are the differences between the two? Let's take a look at the specific differences between them.



The difference between hot galvanized steel pipe and cold galvanized steel pipe



Fourth: there are great differences between the two in the way of operation. The zinc used in hot galvanizing is obtained at the temperature of 450 ℃ to 480 ℃; The zinc in cold galvanized steel pipe is obtained through an electroplating process at room temperature.

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Fifth: there is a great difference in the thickness of zinc coating between cold galvanized pipe and hot galvanized pipe. The thickness of zinc in hot galvanized steel pipe is greater than that in cold galvanized steel pipe.



Sixth: there is also a big difference in the adhesion between the two. The adhesion of cold galvanized steel pipe is worse than that of hot-dip galvanized steel pipe, because the steel pipe matrix and zinc layer of the cold galvanized steel pipe is mutual, the zinc layer is very thin, and it is simply attached to the surface of the steel pipe matrix, which is easy to fall off.



The process used for cold galvanized steel pipe is electroplating. The inner wall of the steel pipe is not galvanized, only the outer wall of the steel pipe is coated with zinc; The process adopted for hot-dip galvanized steel pipe is hot-dip galvanizing, and the inner and outer walls of the pipe are coated with zinc. Relevant regulations have been made that the corrosion resistance of cold galvanized pipes are poor, and the zinc layer is easy to fall off, so they can not be used as gas pipes and water pipes.