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Since nanostructured bainitic microstructure with the excellent balance of strength and toughness is reported by Bhadeshia et al.,1–4) the approach of reducing the scale of the microstructure has been a hot topic. It is known that the size of bainite plates is determined by the chemical composition and heat treatment route.5–8) In industrial production, in order to obtain the microstructure of ultrafine bainite plate and film-like retain austenite (RA), it may be necessary to handle the bainitic transformation at a very low temperature. In general, decreasing the bainite starting temperature (BS) and martensite starting temperature (MS) requires a high carbon content,9) but the high carbon content will significantly deteriorate the welding property and toughness of steels. Therefore, some researchers10–18) adjusted the heat treatment technology of bainite transformation to achieve the ultrafine bainitic microstructure and improve the mechanical properties. Among them, one effective method is the multi-step austempering. Hase et al.14) and Avishan et al.15) adopted a two-step heat treatment to obtain the bimodal size-distribution of bainite plates in an ultrafine bainitic steel. Coarse bainite plates were produced by austempering at a high temperature, followed by austempering at a lower temperature. It was helpful to decrease blocky RA, and achieve the microstructure of ultrafine Transformation Behavior of Bainite during Two-step Isothermal Process in an Ultrafine Bainite Steel