“…It is known that in this steel, in rolled specimens, the magnetic hysteresis behavior is sharply sheared by what is considered to be a rather small plastic deformation (0.5%) [1]. A new modification [2] to the Jiles-Atherton hysteresis model has made it possible to model the magnetic effects of plastic deformation on the magnetic hysteresis B2H curve [3]. The flow curve of the steel, especially in the tensilely deformed specimens, shows evidence of discontinuous yield, which can be explained by a Cottrell atmosphere of carbon atoms initially pinning the dislocations [4]; hence, the ''apparent'' yield stress needed to start dislocation flow is actually greater than what is needed to continue dislocation flow.…”