Plastic-lined steel pipes, based on galvanized seamless steel pipes or welded steel pipes, with the interior weld ribs removed, food-grade polyethylene (PE) pipe material of the same diameter as the galvanized pipe is inserted. The thickness of the polyethylene lining must comply with the HG/T 20538-2016 standard, and after a certain period of pressure and heat treatment, it is shaped. It is a traditional galvanized