The bending processing method of stainless steel elbow is a method of bending the heated tube blank with a die on a hydraulic press; This method is the earliest process method used for elbow, and it has been widely used in elbow production. However, the elbow produced by this method has uneven wall thickness and poor appearance quality, and the die manufacturing cost is high when processing large elbows. Austenitic stainless steel elbow has the characteristics of corrosion resistance, wear resistance, high strength and exquisite appearance, and is widely used in industrial fields and all aspects of daily life. Austenitic stainless steel has also become one of the important and popular metal materials. The content of chromium and nickel in austenitic stainless steel is higher than that in martensitic stainless steel, and its corrosion resistance is higher because of its single-phase structure. The lattice type of austenitic stainless steel is face-centered cubic, with many slip systems and single-phase structure, so it has good plasticity and can be successfully processed by hot pressing and cold pressing. However, in the process of machining, work hardening and deformation induce austenite to transform into partial martensite, which significantly reduces the plasticity and corrosion resistance of materials.