Production of electotechnical cold-rolled sheets with corrosion-resistant coatings

Abstract

A technique for the production of electrotechnical cold-rolled sheets with corrosion-resistant coatings (composed of iron, chromium and silicon) is proposed. This complex technique includes: ingot production by electric arc remelting, hot rolling of the sheets and cold rolling of the sheets. The best quality ply metal ingots are produced by electric arc remelting of a consumable electrode in a hollow revolving billet in a non-oxidizing atmosphere. The technique of hot rolling in the sheets (thickness, 0.5–10.5 mm) from the ingots includes stages of hot and warm rolling with control of temperature and deformation. The technique of cold rolling of the sheets (thickness, 0.3–0.5 mm) containing 4.5%–6.5% of silicon uses controlled pass reduction. The thinnest corrosion-resistant coating contains no more than 9% of chromium and 6.5% of silicon. Cold-rolled electrotechnical sheets are characterized by low power losses under reverse magnetization.