Abstract: This paper analyzes the acceptance requirements for coiler bending of the high temperature sampling cooler, The rebound phenomenon is controlled as far as possible by reasonable design bending and stress relief heat treatment process. All inspection and test indexes of the evaluated parts are qualified, and the snake tube meeting the requirements of dimensional accuracy is obtained. Stress relief heat treatment can effectively eliminate the residual stress caused by cold bending. It has no effect on material properties and microstructure.