Galvanized steel pipes are divided into two categories -hot -dip galvanized steel pipes and cold galvanized steel pipes. Cold galvanized steel pipes are electroplating steel pipes. The content of galvanizing is very small. It is only 10g to 20g per square meter. Its corrosion resistance is not as good as hot galvanized steel pipes. In addition, what are the differences between the two?
The difference between hot -dip galvanized steel pipe and cold galvanized steel pipe
First: The two are very different in the operation method. The zinc used in hot -dip galvanized is obtained in the temperature of 450 ° C to 480 ° C; the zinc in cold galvanized steel pipes is obtained by electroplating process at room temperature.
Second: The thickness of the cold galvanized pipe and the hot -dip galvanized pipe is very different in the thickness of the galvanized layer. The thickness of the zinc in the hot galvanized steel pipe is greater than the thickness of the zinc in the cold galvanized steel pipe.
Third: The surface of the two is different. The surface of the cold -dip galvanized steel pipe is much rough than hot -dip galvanized steel pipes.
Fourth: Cold galvanized pipes and hot -dip galvanized pipes are also very different in price. In order to ensure the quality, hot -dip galvanized steel pipes generally do not adopt a galvanized method such as electroplating; and those small -scale enterprises with relatively old -fashioned equipment will adopt electroprilizer. Therefore It is lower than hot -dip galvanized steel pipes.
Fifth: The hot -dip galvanized steel pipes are all zinc with steel pipes, while the cold galvanized steel pipe only galvanize the steel pipe side.
Sixth: The adhesion of the two is also very different. The adhesion of cold galvanized steel pipes is worse than the adhesion of hot -dip galvanized steel pipes, because the steel pipe matrix of the cold galvanized steel pipe and the zinc layer is independent, the zinc layer is very thin, and it is simply attached to the surface of the steel pipe matrix body body. It is easy to fall off.
The process of cold galvanized steel pipes is electroplating. The inner wall of the steel pipe is not galvanized, and zinc is placed on the outer wall of the steel pipe. The state has made relevant regulations that the corrosion resistance of cold galvanized pipes is poor, the zinc layer is also easy to fall off, and there are hidden safety hazards. Therefore, it cannot be used as an gas pipe and water pipeline.
In summary, the difference between the two is that the thickness of zinc, different smoothness, different price, different price, different corrosion resistance, and different adhesion.
