PU lined composite steel pipe, wear resistant steel pipe anti-aging: The carbon nanomaterials used in polyurethane is a leading international business technology, through a certain proportion and complex process makes both complementary strengths and weaknesses, polyurethane material aging rate in 50 years does not exceed 0.26%. PU lined composite steel pipe, wear resistant steel pipe good combined: Polyurethane lined with steel pipe tightly, using a unique process, casting polyurethane elastomer with steel up to 100% of the binding, the unique overall flanging process, does not appear to fall off, tearing off the air and local. PU lined composite steel pipe, wear resistant steel pipe corrosion resistance: Addition of concentrated nitric acid, fuming sulfuric acid, chlorosulfonic acid and other strong oxidizing acids, the ability of most organic and inorganic acids, alkalis, salts, good corrosion resistance to stress corrosion, the ability of 10% nitric acid, formic acid, acetic acid, 36% or less of hydrochloric acid, hydrobromic acid 20%, the dilute hydrofluoric acid, various concentrations of carbonic acid, boric acid, butyric acid, alkali and salt majority, mercury, air, NH3, CO2, CO, NO2, HCL and other corrosive gases.