Disadvantages: the zinc layer of cold galvanized steel pipe is electroplated, and the zinc layer is separated from the steel pipe matrix independently. The zinc layer is thin, simply attached to the steel pipe matrix, and easy to fall off. Therefore, its corrosion resistance is poor. It is forbidden to use cold galvanized steel pipes as water supply pipes in new houses.
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use
1. Fire fighting project: At present, the fire fighting water supply pipes are basically galvanized pipes, and the outer layer of galvanized pipes is painted, so that everyone can see that the red fire fighting pipes are actually made of galvanized pipes.
2. Steel structure and welding engineering: At present, many scaffolding factories outside are made of welded steel pipes, but welded steel pipes are easy to rust and need to be painted to prevent rust. In order to solve this problem, many new steel structures are directly made of galvanized pipes, which can save working hours and last longer.
3. Agriculture: mainly used to build greenhouses, flower sheds and melons.
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