High-strength low-iron-loss silicon steels fabricated by cold rolling

In this study, solid solution strengthening and dislocation strengthening is employed to fabricate high-strength electrical steels with low iron loss at a high frequency. Cast ingots with silicon content up to 4.5 wt% exhibit much lower Vickers hardness than 6.5 wt% Si steel and are feasible for forging and rolling. The cold-rolled thin sheets demonstrate good surface quality without edge cracks. The yield strength and magnetic properties can be tailored using heat treatment. Compared with data from state-of-the-art high-strength silicon steel 15HST780Y, the iron loss P-1.0T/400Hz is 20% lower at the same yield strength.