Patent ID: 8020897

Claim:
A joint structure of a steel pipe and a metal pipe, comprising: a socket integrally fixed to said steel pipe at a face substantially perpendicular to an axis of the steel pipe; and an epoxy resin or polyimide resin having a glass transition temperature of 140° C. or higher, the steel pipe including a joining end including a flat portion on an outer surface of the joining end adjacent to a base of said steel pipe, and an uneven portion of the outer surface of the joining end adjacent to a front end of said steel pipe, the socket covering the joining end of said steel pipe, the metal pipe including a joining end, the metal pipe joining end being interposed between the socket and the joining end of said steel pipe, wherein the joining end of said steel pipe is joined to the joining end of said metal pipe at a crimped portion, and wherein the epoxy resin or the polyimide resin is located between an inner surface of the socket and an outer surface of the joining end of said metal pipe and located between the outer surface of the joining end of said steel pipe and an inner surface of the joining end of said metal pipe.