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• Simple phenomenological model regarding the dependence of energy losses on the strip width. • Simple phenomenological model regarding the dependence of magnetization curve on the strip width. • Energy loss separation. • Estimation of cutting damaged width strip. We investigate the effect of mechanical cutting on the magnetic properties of high permeability grain-oriented (HGO) laser-scribed Fe-Si sheets. Measurements have been performed on strips of different widths (5 to 60 mm) cut from 0.27 mm thick sheets. Normal magnetization curve and energy loss have been determined by means of a digitally controlled single strip tester from 1 Hz to 1 kHz at peak magnetic polarization values J p = 1000 mT and 1700 mT. The results fit into a simple phenomenological model regarding the dependence of magnetization curve and energy loss on the strip width, in substantial continuity with the approach originally developed for non-oriented electrical steels. The hysteresis W h and excess W exc loss components are shown to depend on the strip width according to a hyperbolic law, with a limiting fully hardened strip predicted to occur for widths around 3.5 mm. It is then consistently observed that the mechanical cutting of standard 30 mm wide HGO Epstein strips is conducive to an increase of the energy loss at 50 Hz and 1.7 T of the order of 13 %. [ABSTRACT FROM AUTHOR]

• Non-oriented steels cut through guillotine and water-jet technologies. • Strain-hardened band width estimation using hyperbolic dependence based on magnetization curves. • Analysis of losses by identifying their components in strain-hardened zones. • Phenomenological formulation for hysteresis and excess loss dependence on strip width. • General and simple model to be applied for different cut profiles and technologies. Magnetization curve and energy losses have been analyzed in non-oriented (NO) Fe-Si alloys with variable thickness (0.20 mm–0.35 mm), cut at widths ranging between 5 mm and 60 mm, in order to assess the impact of cutting, either done by punching or water-jet techniques. Measurements were performed by means of a digitally controlled single strip tester, from dc up to 1.5 kHz, at peak polarization values J p = 1.0 T and 1.5 T. The evolution of the magnetization curve and the structure-dependent hysteresis W h and excess W exc loss components have been assessed as a function of the strip width using a simple phenomenological model, by which the extension of the damaged area at the edges of the cut sheets is estimated. Such a model assumes a hyperbolic dependence of the measured polarization on the cut strip width. The limiting values of W h and W exc for the fully damaged and the pristine sheets are in this way estimated, showing that one can simply and affordably predict the magnetic behavior of NO Fe-Si steels subjected to cutting. [ABSTRACT FROM AUTHOR]