Shozaburo Nakashima1, Kunihide Takashima1, Jirou Harase1 and Katsuro Kuroki1
R & D Laboratories III, Nippon Steel Corporation, Kitakyushu. Present address: Electromagnetic Materials, Steel Research Laboratories, Nippon Steel Corporation, Futtsu
A study was made on the effect of Sn addition on the secondary recrystallization of 3.8 mass%Si grain-oriented electrical steel.
(1) With increasing Si content (3.0→3.7 mass%), secondary recrystallization is suppressed. This is attributed to the large size of primary-recrystallized grains, the small amount of Goss nuclei in the primary-recrystallized matrix and the less effective inhibitors for secondary recrystallization in the steel with a high content of Si.
(2) Upon Sn addition to the steel with a high content of Si (3.8 mass%), secondary recrystallization occurs with a highly oriented Goss texture, which results in excellent magnetic properties. Sn addition is considered to eliminate urfavorable factors for secondary recrystallization caused by the increased Si content mentioned above.
single-stage cold rolling process, electrical steel, grain-oriented elecrical steel, secondary recrystallization, magnetic property, tin
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