The coated steel pipe combines the high strength of ordinary steel pipes and the anti-corrosion performance of plastic grease products, with a compressive performance of 0-5.0 MPa. The usage temperature is 0-110 degrees Celsius, and the coating thickness is between 100 microns and 400 microns, usually 350 microns. The powder coating of coated steel pipes has added flame retardants and modified epoxy resin powder. The coating has superior temperature resistance and does not burn or soften during long-term use.