On the other hand, when focusing on materials used for medical parts, austenitic stainless steels are used for various parts from the viewpoint of corrosion resistance and biocompatibility. Particularly JIS 304 and 316L stainless steels are used in many varieties [6]. The austenitic stainless steels are known to martensitic transformation by the strain. Its properties are clearly different from other metal materials, and it is assumed that some effects appear when parts are processed.