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18Cr ferritic stainless steels are being widely used across a range of areas including architectural parts and architectural parts, household electric appliances and kitchen utensils.1,2) The stainless steels exhibit superior corrosion resistance and formability, whereas they have relatively low room temperature ductility due to their ductile-brittle transition temperature (DBTT) located around ambient temperature.1) In order to improve their ductility, trace transition metal elements (e.g. Nb and Ti) are often added in a series of the commercial ferritic stainless steels.1–3) In general, these transition metal elements would play a role of stabilizing trace solute interstitial elements in the ferrite (α-Fe) matrix by forming carbide and/or nitride precipitates.4–7) It has been reported that the addition of stabilizing elements often improves mechanical properties8,9) and its associated room temperature ductility.10) These general understandings can provide an assumed mechanism that the scavenging effect by added stabilizing elements might influence DBTT of the steels. DBTT can be considered responsible for varied stress levels controlled by thermally activated process of dislocation glide.11–13) In practical terms, 18Cr ferritic stainless steels Strain Rate Sensitivity of Flow Stress Measured by Micropillar Compression Test for Single Crystals of 18Cr Ferritic Stainless Steel