Plastic lined steel pipes and a production method thereof

Have an adhesive layer on the inner surface of the steel pipe, further comprising a plastic layer on the inside, and the initial shear bond strength between the steel pipe and the plastic layer is 2.0MPa or more, in steel pipe steel tube was surface treatment in advance inside surface There, as a surface treatment, and subjected to chemical conversion coating of phosphate which was grain refinement treatment, preferably plastic lined steel pipe characterized by having an epoxy primer layer between the steel pipe and the adhesive layer. Insert the plastic pipe having an adhesive layer on the outer surface of the outer diameter smaller than the steel pipe inner diameter having been subjected to surface treatment, by narrowing the outer diameter of the steel pipe in close contact with the plastic pipe, the melting completion temperature above the plastic pipes of the adhesive layer method for producing a resin lining steel pipe characterized by heating below the melting start temperature.