After cooling to room temperature, the Hc values of stepwise heated samples present a peak behavior, in correspondence to a pronounced decrease in Ms. The maximum value of Hc is found for the sample annealed up to 600 °C. Such peak behavior of Hc indicates that during reversion, martensite regions become progressively smaller and isolated, as supported by EBSD results. Shape magnetic anisotropy effects become stronger with increasing number of α0/γ interfaces leading to the increase of Hc.