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:
Jan. 28, 1997
Filed:
Jul. 13, 1995
Yasunari Yoshitomi, Kitakyushu, JP;
Takehide Senuma, Kitakyushu, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention relates to the provision of a process for producing a grain oriented electrical steel sheet having excellent magnetic properties, and comprises heating a slab comprising by weight 0.021 to 0.075% of C, 2.5 to 4.5% of Si, 0.010 to 0.060% of acid sol. Al, 0.0030 to 0.0130% of N, 0.014% or less of (S and 0.405 Se) and 0.05 to 0.8% of Mn with the balance being Fe and unavoidable impurities to a temperature below 1280.degree. C. to hot-roll the slab, subjecting the hot rolled sheet to cold rolling with a draft of 80% or more and subjecting decarburization annealing and then finish annealing, characterized in that, after the hot rolling, the hot strip is taken up at a temperature of 600.degree. C. or below and subjected to nitriding at any stage from after the hot rolling to the completion of the secondary recrystallization in the finish annealing without annealing of the hot rolled sheet.