Determining the effect of grain size and maximum induction upon coercive field of electrical steels

► In electrical steels, coercive field (Hc) depends linearly on the reciprocal of grain size (GS). ► Slope of such dependence lies around 0.9 (A/m)mm at 1.0 T maximum induction. ► Possibility of an inverse square root proportionality Hc∝1/sqrt(GS) is to be discarded. ► Slope and y-intercept of the Hc∝1/GS relation grow with maximum induction (Bmax). ► A general relation can be obtained, with average deviation below 4%: Hc=22B0.50−0.89(B0.13/ℓ).