So-called plastic-lined steel pipes refer to steel pipe interiors coated with materials for rust or corrosion prevention. Common lining materials include plastic or zinc. After using plastic-lined steel pipes, many areas no longer need to worry about rusting issues.

People have adopted a three-layer protective method. The first layer is the galvanized layer, which is the innermost layer, applied through electroplating zinc technology to coat the surface of steel with zinc. The second layer involves applying an epoxy primer to the galvanized layer, forming a high-molecular protective film to safeguard it. The third layer's protective measure is the application of topcoat paint, which not only further ensures the protective effect but also facilitates the identification of different pipes. With this three-layer protection, people can now confidently lay pipes in various terrains without worrying about corrosion issues.