Plastic-coated composite pipe: also known as plastic-coated pipe, plastic-coated steel pipe, and steel-plastic composite pipe, it is a new type of pipe material. It is based on welded steel pipe and seamless steel pipe, and the inner and outer walls are coated with epoxy resin or polyethylene. Powder, with anti-corrosion and corrosion resistance, is a non-toxic, non-radiation green and environmental protection pipe, which is widely used in various fluid transportation.