The difference between hot-dip galvanized steel pipe and cold-galvanized steel pipe, hot-dip galvanized steel pipe and cold-galvanized steel pipe are both called galvanized steel pipe, galvanized steel pipe is divided into two types, one is hot-dip galvanized steel pipe, the other is Cold galvanized steel pipe, cold galvanized steel pipe is electro-galvanized steel pipe, the content of galvanized is very small, only about 10 grams to 20 grams per square meter, its corrosion resistance is very poor compared with hot-dip galvanized steel pipe, hot-dip galvanized steel pipe Its corrosion resistance is dozens of times that of cold galvanized steel pipes. Let's take a look at the differences between hot-dip galvanized steel pipes and cold galvanized steel pipes.
Hot dip galvanized steel tube (Hot dip galvanized steel tube), in order to improve the corrosion resistance of the steel pipe, the general steel pipe is galvanized. Galvanized steel pipe is divided into two types: hot-dip galvanizing and electro-galvanizing. The hot-dip galvanizing layer is thick, the cost of electro-galvanizing is low, and the surface smoothness is reduced.
The difference between hot dip galvanized steel pipe and cold galvanized steel pipe
The first type: cold galvanized pipes and hot-dip galvanized pipes have great differences in operation methods. The zinc in hot-dip galvanizing is obtained at 450 degrees Celsius to 480 degrees Celsius, while the zinc in cold galvanized steel pipes is zinc obtained by electroplating at room temperature.
The second type: There is a big difference in the thickness of the galvanized layer between the hot-dip galvanized pipe and the hot-dip galvanized pipe. The thickness of the zinc in the hot-dip galvanized steel pipe is much thicker than that of the cold-galvanized steel pipe.
The third type: cold galvanized pipe and hot-dip galvanized pipe are very different in surface smoothness. The surface of cold-galvanized steel pipe is much rougher than that of hot-dip galvanized steel pipe.
The fourth type: cold galvanized pipes and hot-dip galvanized pipes are also very different in price. Hot-dip galvanized pipes are produced by regular galvanized pipe manufacturers. In order to ensure the quality of galvanized pipes, they generally Under the circumstance, the galvanizing method of electro-galvanizing will not be used, and those enterprises with relatively old equipment and relatively small scale mostly use electro-galvanizing. Naturally, cold galvanized steel pipe is much cheaper than hot-dip galvanized steel pipe.
The fifth type: cold galvanized steel pipe only has one side of galvanized steel pipe, and hot-dip galvanized steel pipe should be fully galvanized.
The sixth type: cold galvanized pipes and hot galvanized pipes are also very different in adhesion. The adhesion of cold galvanized steel pipes is much worse than that of hot galvanized steel pipes, because the steel pipes of cold galvanized steel pipes The matrix and the zinc layer exist independently. The zinc layer is very thin, and it is simply attached to the steel pipe base, so the cold galvanized steel pipe is easy to fall off.
The cold galvanized steel pipe adopts the electroplating process, only the outer wall of the steel pipe is galvanized, and the inner wall of the steel pipe is not galvanized; According to relevant regulations, cold galvanized steel pipes cannot be used as gas pipes and water pipes. The corrosion resistance of cold galvanized steel pipes is too poor, and the zinc layer is easy to fall off. It has been banned by the state due to potential safety hazards.
The difference between hot-dip galvanized steel pipe and cold-galvanized steel pipe shared today is here. In addition to the above, the biggest difference between the two is the difference in corrosion resistance. The amount of galvanized steel for cold-galvanized steel pipe is very small, only 10-50g/m2, hot-dip galvanizing is several times higher, which is obviously safer. If you still do not understand this content, you can contact customer service for more support.