Nippon Steel Corporation

Shigenobu Koga

Yoshiaki Shimoyama

Shuichi Yamazaki

Hisashi Mogi

Naruhiko Nomura

Masahiro Fujikura

Ichiro Tachino

Katsuyki Ohba

The present invention provides a method for indirect-electrification-type continuous electrolytic etching of a metal strip suitable for producing a low-core-loss, grain-oriented silicon steel sheet not susceptible to the deterioration of core loss after stress-relief annealing, and an apparatus for the indirect-electrification-type continuous electrolytic etching. It is a method for indirect-electrification-type continuous electrolytic etching of a metal strip and an apparatus for the same for continuously forming grooves by indirect-electrification-type electrolytic etching on a metal strip on which an etching mask is formed in etching patterns on one or both surfaces, wherein: plural electrodes of an A series and a B series are arranged alternatively, at least in a pair, in said order in the travelling direction of the metal strip so that they face the surface to be etched of the metal strip on which the etching patterns are formed; the space between the metal strip and the group of the electrodes is filled with an electrolyte; and voltage is applied across the A series and B series electrodes.

Method for indirect-electrification-type continuous electrolytic etching of metal strip and apparatus for indirect-electrification-type continuous electrolytic etching

A non-oriented magnetic material consisting essentially of .ltoreq.0.065% C, .ltoreq.0.10% Al, 0.31 to 3.15% Si, .ltoreq.0.020% O, .ltoreq.0.01% N and B present in such amounts that the ratio of B/N is in the range of 0.5 to 2.50. The non-oriented magnetic material of this invention is produced by hot rolling a material of the above composition, subjecting the hot-rolled sheet to at least one cold-rolling step with intermediate annealing followed by a continuous annealing step and optionally a reannealing step to produce a non-oriented magnetic material.

Non-oriented electric iron sheet and method for producing the same

A non-oriented silicon steel sheet with a low watt loss value as well as uniform magnetic properties which contains 1.5-3.5% Si, an exceedingly low C content, and a low soluble Al content, and has a ratio of B to N in the range of 0.4 to 2.0, and further contains at least one rare earth element.

Non-oriented silicon steel sheet with stable magnetic properties

Growing community of inventors

Kitakyushu, Japan

Shigenobu Koga