The PE coating of external PE and internal EP anti-corrosion steel pipes has excellent corrosion resistance and water resistance, which can effectively resist the erosion of chemicals such as acid, alkali, and salt; The EP coating has good wear resistance and high-temperature stability, which can prevent steel pipes from falling off, cracking, and other phenomena in high-temperature environments. Therefore, the outer PE and inner EP anti-corrosion steel pipes can not only be suitable for general corrosive environments