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Company production of steel lining plastic pipe, the use of seamless steel tubes for the shell matrix, heat flow area with thermoplastic materials () rotating rotomolding a molding process, its characteristic is natural cooling contraction after the steel plastic thermoforming, gangsu binding force strong, not easy to take off a layer, different work without overlap joints, impact resistance, high strength, smooth surface, the friction coefficient is small, not easy to scale, good corrosion resistance and other properties.