Hot stamping is a technology to produce automobile parts (e.g. A,B-pillar, roof rail, bumper, etc.) that require high strength and high formability. Applications of hot stamping are expanding rapidly because of its advantages of precise dimension, high rigidity and complex geometry of the formed parts. However, hot stamping shows limitations in process; it needs high temperature for forming (over A3 temperature), rapid quenching for hard martensite phase at room temperature, and additional tempering for better toughness. Recently, the medium Mn steel with 3-10 wt.% Mn have been actively studied due to its excellent tensile strength (< 1.2 GPa) and ductility (< 40%). In present study, we studied the Nb-bearing medium Mn steel for the warm stamping process. The low A3 temperature and martensitic transformation occurring even during slow cooling of medium Mn steel could solve the disadvantages of present hot stamping, and Nb precipitation produces additional hardening.