Nippon Steel Corporation

Kajima Corporation

Nippon Steel Engineering Co., Ltd.

Nippon Steel & Sumikin Coated Sheet Corporation

Yoneo Yamada

Takeshi Saito

Masahiro Fujikura

Akira Sakaida

Kazutaka Higashine

Hiroshi Ishikawa

Takubi Hamano

Kentaro Chikuma

Morihiro Matsumoto

Masanori Niwa

Yuji Okuzaki

Jiroh Mino

Satoru Miura

Masanori Karikomi

Tomohiko Sakai

Koichi Fujiwara

A magnetic shield structure having openings, the structure comprising a plurality of similar magnetic blind bodies, each blind bodyhaving an imaginary blind core plane F and a plurality of magnetic material slatsbeing spaced from each other by a distance d required for magnetic shielding, each slatintersecting the blind core plane F at a longitudinal central axis C thereof, the longitudinal central axes of the slats are oriented substantially in parallel to each other on the blind core plane F. The blind bodiesare coupled in a row by serially coupling each slatin each blind bodyto a corresponding slatof adjacent blind bodythrough overlapping or abutting of slat terminal portions, whereby the blind core planes Fa, Fb of the blind bodiesare so coupled as to define a successive magnetic shield plane, and spaces d between adjacent slatsin each blind bodyform openings in the magnetic shield structure. Preferably, three or more magnetic blind bodiesare coupled in a row so as to form a closed magnetic path. The blind bodiesmay be stacked side by side in such a manner that the blind core plane Fa, Fb are parallel to each other and orientation of the slat central axes in each blind bodybeing selected so as to optimize attenuation of magnetic field across the magnetic shield structure.

Magnetic shield structure having openings and a magnetic material frame therefor

A magnetic shield panel includes a magnetic shield member made of magnetic material; and a metallic plate or a translucent plate member, wherein the magnetic shield member is attached to the metallic plate or the translucent plate member.

Magnetic shield panel

In the production of a grain-oriented electromagnetic steel strip or sheet having a low watt loss, a silicon steel slab containing not more than 0.085% by weight of carbon, from 2.0% to 4.0% by weight of silicon, from 0.030% to 0.090% by weight of manganese, and from 0.010% to 0.060% by weight of sulfur is conventionally hot-rolled, cold-rolled, and final-annealed. However, this production process involves some problems in regard to the uniformity of the magnetic properties along the full length of the coiled strip. According to the present invention, a silicon steel slab additionally contains from 0.02% to 0.2% by weight of copper, the exit temperature during the finishing-hot-rolling step is controlled in such a manner that the temperature of the top portion of the hot-rolled strip is in the range of from 900.degree. C. to 1050.degree. C. and the temperature of the middle and bottom portions thereof is in the range of from 950.degree. C. and 1150.degree. C., and final cold-rolling is carried out at a reduction ratio of from 50% to 80%, with the result that the final product has good and very uniform magnetic properties over the full length thereof.

Process for producing a grain-oriented electromagnetic steel sheet or

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Tokyo, Japan

Yoneo Yamada