Abstract: The WB36 steel medium frequency elbow is tested for water-cooled forming, and after the pipe is bent, the tempering heat treatment and normalizing + tempering heat treatment are carried out on the elbow area respectively to improve the hardness, metallographic structure and mechanical properties of the pipe bending area, and on the premise of ensuring the quality of the elbow area, the performance of the intermediate frequency bending area meets the requirements of relevant standards.