You should opt for hot-dipped galvanized steel pipes when your project involves exposure to severe weather,high moisture,or chemical environments.Their robust protection makes them the best choice for long-term use in applications like outdoor construction,sewage systems,and water treatment plants.If your project requires galvanized steel pipes for less demanding conditions or you are working with a tighter budget,pre-galvanized steel pipes may be the better option.They are perfect for applications where moderate corrosion resistance is needed,such as in indoor systems or structures with less exposure to the elements.