METHOD FOR PRODUCING ELECTRICAL STEEL EXHIBITING A HIGH MAGNETIC INDUCTION

摘要

The invention relates to the iron and steel industry and can be used for producing oriented electrical steels exhibiting high magnetic flux penetrability. The inventive method consists in melting a metal, continuously casting a melt, heating a slab, and carrying out hot rough and finishing rollings, two cold rollings separated by recrystallising-decarbonising annealing, and high-temperature and rectifying annealings. The slab is heated to temperatures which make it possible to obtain the ferrite structure of the metal. The hot finishing rolling is carried out within a range of phase-recrystallisation temperatures alpha } gamma } alpha in such a way that an austenite volume fraction is equal to or less than 3 % at the final stage of the hot finishing rolling. Before casting the melt comprises 0.020-0.028 mass % of carbon, 3.05-3.15 mass % of silicium, 0.1-0.3 mass % of manganese, 0.4-0.6 mass % of copper, 0.011-0.025 mass % of acid soluble aluminium, 0.008- 0.016 mass % of nitrogen, the rest being iron. Prior to casting, a carbon concentration in the melt is adjusted in relation to a silicium concentration: when the silicium concentration is increased by 0.1 mass % in excess of 3.15 mass %, the carbon concentration being increased by 0.003 mass % over 0.028 mass %.