Plastic lined steel pipe with end corrosive protection core and method for producing same

A plastic lined pipe with an end corrosive protection core used for snow removal, water supply, air-conditioning, firefighting, drainage, and other piping etc. and a method of production of the same, more particularly a plastic lined pipe with an end corrosive protection core, used connected by a coupling not having an end corrosive protection function, having an adhesive layer on an inner surface of a steel pipe or a steel pipe galvanized on its outer surface, having a polyolefin plastic layer or cross-linked polyolefin plastic layer on its further inner side, the steel pipe given substrate treatment on its inner surface in advance, the substrate treatment comprising forming a phosphate chemical conversion coating treated for grain refinement, and provided at its end with a corrosive protection core formed by a cylindrical part having dimensions and rigidity enabling strong fitting to the end inner surface of the plastic lined steel pipe and a flange part having a shape and rigidity enabling attachment, then close fitting to the end while completely covering the end face of the plastic lined steel pipe, the outer surface of the cylindrical part being provided with circumferential grooves, the material being a high corrosion resistance metal, and the inner surface of the flange part of the corrosive protection core having a rubber ring closely fit to it, and a method of production of the same.