Steel lining polyurethane composite tube is one of the mainstream wear-resisting pipe (another type of HDPE) in the word, it is suitable for coarse particles and high pressure, high speed transmission medium, in this mining conditions, the better performance of polyurethane will play to the extreme. Polyurethane raw material is Active elastomer material, by the stress polyurethane shape change after stress lag time so that most of the stress generated by erosion forces into internal energy and vaporized form of heat. And with the strength of the remaining small portion of scour deformation of polyurethane lag bounce back transport medium to offset subsequent stress erosion.