A manufacturing method of a heating furnace tube and heating furnace

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PROBLEM TO BE SOLVED : To provide a heating furnace pipe and the manufacture of the heating furnace pipe, capable of preventing the lowering of productivity accompanied by the measuring a carburization depth, the increase of maintenance cost, etc., as much as possible. SOLUTION : In this heating furnace pipe 1 comprising two elements, one heating furnace pipe element 10 made of a rare earth oxide particle dispersion type steel alloy containing 17-26 wt.% of Cr and 2-6 wt.% of Al is interconnected to the other heating furnace pipe element 20 made of heat- resistant metal by diffused junction. Further, the manufacture of this heating furnace pipe includes a step of forming a film M of insert metal on one heating furnace pipe element 10 and the other heating furnace pipe element 20, a step of pressure-contacting the heating furnace pipe element 10, the heating furnace pipe element 20, and a short joint pipe 30 to one another, and a step of performing the diffused junction of the heating furnace pipe element 10 and the heating furnace pipe element 20 with the aid of the short joint pipe 30 under pressure.