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The interest in studying Mn based steels, twinning induced plasticity (TWIP) steels and transformation induced plasticity (TRIP) steels has increased in the past few decades because of the good combination of strength, ductility and formability that they offer, which is much suited to automobile applications.1–6) Even though these steels have a good mix of mechanical properties, they are not used extensively due to drawbacks such as delayed cracking, issues pertaining to melting and homogenization with manganese addition and hydrogen embrittlement. These shortcomings can be overcome by reducing the amount of Mn and adding other suitable elements. However, a decrease in Mn content affects ductility and other mechanical properties. Grain boundary Engineering (GBE) is a possible way to compensate for the trade off in properties due to Mn addition. It is well known that GBE is an effective approach to suitably tailor properties such as ductility, stress corrosion and intergranular cracking, creep and other functional properties of polycrystalline materials.7–13) In this approach, the above mentioned properties can be improved by changing the grain boundary character distribution (GBCD), specially by increasing the fraction of Coincident site lattice (CSL) boundaries in the overall grain boundary character distribution. Watanabe and co-workers14–16) introduced the concept of GBE in polycrystalline materials by thermo-mechanical processing. Time, temperature and accumulated strain during processing are the main parameters that control the grain size, shape and boundary microstructures. Although there Grain Boundary Engineering of Medium Mn TWIP Steels: A Novel Method to Enhance the Mechanical Properties