Abstract: Elaborated in the paper is the situation concerning the R&D of the 301L stainless steel seamless pipe for the hi-speed locomotive service.The stainless steel blank pipe is prepared with the hot-piercing process,and then successfully turned into theΦ44 mm×2 mm seamless steel pipe via multi-pass cold-rolling deformation.As the result of the said deformation,a great number of martensite develops along the rolling direction,and the work-hardening is obvious.The solid solution treatment as conducted at 950℃that follows results in full re-crystallization with good grain size homogeneity.It is concluded that the 301L stainless steel seamless pipe as developed is in full compliance with applicable requirements as specified under ASTM A 666—2015 for chemical composition,microstructure and property.