MANUFACTURE OF GRAIN ORIENTED SILICON STEEL SHEET WITH HIGH MAGNETIC FLUX DENSITY AND LOW IRON LOSS

Japanese Patent JP3885391

B2

PROBLEM TO BE SOLVED: To increase the integration degree of crystal orientation and to obtain stabilized high magnetic flux density and low iron loss by subjecting a continuously cast slab containing specific amounts of C, Si, Mn, B, N, S, Se, and Al and having specific columnar crystal ratio, to specific heating and soaking and then applying hot rolling and cold rolling to it.
SOLUTION: A continuously cast slab for silicon steel sheet which has a composition containing, by weight, 0.03-0.10% C, 2.5-4.5% Si, 0.05-1.5% Mn, 0.0010-0.0060% B, 0.0030-0.010% N, and 0.010-0.040% of S and/or Se within the range satisfying Mn/(S+Se)≥2.5, further containing 0.0010-0.0080% Al, and further containing, if necessary, 0.005-0.30% each of Cu, Sb, Sn, Bi, and Mn as inhibitor elements, is cast, and its columnar crystal ratio is regulated to ≥40%. This cast slab is subjected to temperature-raise and heating from 1250°C up to a temperature T not lower than 1350°C within 1 hr and soaked for (t) min, where 1/5(1450-T)≤t≤2/5(1500-T) is satisfied. Then the cast slab is hot rolled, cold rolled, and subjected to decarburizing annealing and to final finish annealing.

Kazuaki Tamura
Mitsumasa Kurosawa

JP33117498A

February 21, 2007

November 20, 1998

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jfe Steel Corporation

C21D8/12; C21D9/46; C22C38/00; C22C38/02; C22C38/60; H01F1/16; (IPC1-7): C22C38/00; C21D8/12; C21D9/46; C22C38/02; C22C38/60

JP3017230A

Kosaku Sugimura
Hiroshi Tokunaga
Umemoto Masao
Juno Aoki
Shiro Fujitani

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