Steel-plastic composite pipe is assembly with engineering plastic pipe which lined with a metal thin-walled pipe, the inner pipe is made of ultra high molecular weight polyethylene (UHMW-PE pipe). The use of steel-plastic composite pipe: using with steel-plastic composite pipe fittings, it has a corrosive effect for conveying fluids, gases, solid-liquid mixture to replaced by stainless steel, rubber lined pipes, glass pipes and other precious metal lined pipe. Usually function as follows: 1, Thermal power plant-----For fly ash pipeline, wear-resistant, non-scaling. 2, Mining industry-----Used to transport ore powder solids etc. and also can be used as a tailings pipe, concentrates pipe. 3, Dredging Industry-----Used to dredge sand pipe. 4, Granary-----Used for air delivery of food pipe