Process for preparation of thin grain oriented electrical steel sheet having superior iron loss and high flux density

摘要

Disclosed is a process for preparing a thin grain oriented electrical steel sheet having a final thickness of 0.05 to 0.25 mm from a silicon steel cast strip having a thickness of 0.2 to 5 mm and obtained by rapid cooling and coagulation comprising 0.050 to 0.120% by weight of C, 2.8 to 4.0% by weight of Si and 0.05 to 0.25% by weight of Sn, wherein the starting silicon cast strip further comprises up to 0.035% by weight of S and 0.005 to 0.035% by weight of Se, with the proviso that the total amount of S and Se is in the range of 0.015 to 0.060% by weight, 0.050 to 0.090% by weight of Mn, with the proviso that the Mn content is in the range of {1.5 x [content (% by weight) of S + content (% by weight) of Se]} to {4.5 x [content (% by weight) of S + content (% by weight) of Se]} % by weight, 0.0050 to 0.0100% by weight of N, and {[27/14] x content (% by weight) of N + 0.0030} to {[27/14] x content (% by weight) of N + 0.0150} % by weight of acid-soluble Al.