Method for removing creases of thermal machining surface of heat-resisting alloy

The method relates to a method for removing creases of a thermal machining surface of a heat-resisting alloy and belongs to the technical field of heat-resisting alloy machining. The method is characterized in that technical parameters controlled in the process are that lower-limit hot machining temperature is strictly controlled when a tube-making blank is upset, wherein the lower-limit hot machining temperature is 1050-1100 DEG C, and upper-limit hot machining temperature is 1200-1230 DEG C; the encapsulation is carried out in a blank forming process so as to limit the flow of metal before the outer surface of the metal is contacted with the wall of an extruding cylinder during upsetting, wherein an encapsulation material is carbon steel or stainless steel, and the thickness of the encapsulation material is 3-5mm. The method is suitable for eliminating the surface crease defect caused by the fact that recrystallization does not occur or local recrystallization occurs in the blank forming process of a heat-resisting alloy pipeline of an ultra-supercritical thermal power generating unit at steam temperature of 700 DEG C, so that the surface quality in the blank forming process is improved, the material yield of the alloy is improved, and the production cost is lowered.