BENDING METHOD OF SUPER ALLOY MEMBER

PROBLEM TO BE SOLVED: To provide a bending method of a super alloy member, which can prevent the occurrence of an intergranular crack on a surface layer of a supper alloy member composed of an Ni-based alloy system or a Fe-Ni-based alloy system due to bending.SOLUTION: In a bending method, after a work hardened layer elimination step is performed on a pipe A to a pipe C, a bending step is performed. In the work hardened layer elimination step, the pipe A to the pipe C are heated inside a heating furnace. In the work hardened layer elimination step, first, the pipe A to the pipe C are heated to a temperature range (called a work hardened layer elimination temperature range) higher than a softening temperature allowing bending and below a melting temperature at which the crystal grain boundary of the pipe A to the pipe C melts. In this embodiment, the work hardened layer elimination temperature range is set to be 1, 175°C or higher and below 1,250°C.