The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 23, 2017
Filed:
May. 13, 2014
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Tatsuhiko Sakai, Tokyo, JP;
Koji Hirano, Tokyo, JP;
Satoshi Arai, Tokyo, JP;
Yoshiyuki Ushigami, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A silicon steel sheet () containing Si is cold-rolled. Next, a decarburization annealing () of the silicon steel sheet () is performed so as to cause a primary recrystallization. Next, the silicon steel sheet () is coiled so as to obtain a steel sheet coil (). Next, an annealing () of the steel sheet coil () is performed through batch processing so as to cause a secondary recrystallization. Next, the steel sheet coil () is uncoiled and flattened. Between the cold-rolling and the obtaining the steel sheet coil (), a laser beam is irradiated a plurality of times at predetermined intervals on a surface of the silicon steel sheet () from one end to the other end of the silicon steel sheet () along a sheet width direction (). When the secondary recrystallization is caused, grain boundaries passing from a front surface to a rear surface of the silicon steel sheet () along paths of the laser beams are generated.