Reasons for Strictly Controlling the Cooling Water Temperature for Galvanized Steel Pipes

In the water cooling process for galvanized steel pipes, it is stipulated that the temperature of the cooling water should be strictly controlled within the range of 50～80°C. This is to minimize the temperature difference between the galvanized steel pipes after air cooling on the cooling bed and the cooling water. This step is crucial to prevent differential shrinkage due to the different coefficients of linear expansion between zinc and iron. By doing so, cracking of the galvanized layer can be avoided, as such cracks can compromise the quality of the galvanized layer and reduce its corrosion resistance.