Plastic-lined steel pipes, based on galvanized seamless steel pipes and welded steel pipes, with the inner wall weld ribs removed, food-grade polyethylene (PE) pipes of the same diameter as the galvanized pipe are inserted. The thickness of the polyethylene lining must meet the HG/T 20538-2016 standard. After a certain period of pressure and heat treatment, it is shaped, representing an upgraded version of the traditional galvanized pipe.
