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Anisotropy constants and rotational hysteresis have been investigated at different stages of optimal heat treatment on 8-mm-diameter spherical samples. The changes in the uniaxial anisotropy constant obtained upon tempering are in good agreement with the respective changes in coercive force. Rotational hysteresis has been measured in the range from 400 to 28 800 Oe. Two maxima have been obtained on the curves of the rotational hysteresis versus field after all heat treatments. The first maximum is interpreted in terms of reversal magnetization of single-domain precipitates in a low magnetic matrix. The nature of the second maximum is not clear.