Method for producing silicon-chromium grain oriented electrical steel

Producing a grain oriented electrical steel having improved magnetic properties comprises: (a) providing a hot processed strip having an austenite volume fraction and an isomorphic layer on each surface strip, where the strip comprises 2.54.5% silicon, 0.1-1.2% chromium, less than 0.050% carbon, less than 0.005% aluminium, not greater than 0.1% sulphur, not greater than 0.14% selenium, 0.01 1.0% manganese and balance iron, and the strip has a volume resistivity of at least 0.010% carbon so that the austenite volume fraction is at least 2.5% and each isomorphic layer having a thickness of at least 10% of the total thickness of the hot processed strip; (b) cold rolling the strip to an intermediate thickness; (c) annealing; (d) cold rolling to a final thickness; (e) decarburise annealing to prevent magnetic ageing; and (f) coating at least one surface of the annealed strip with an annealing separator coating, and final annealing the coated strip to effect secondary grain growth and thereby providing a permeability measured at 796 A/m of at least 1780.