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:
Dec. 28, 2010
Filed:
May. 19, 2006
Tomoji Kumano, Kitakyushu, JP;
Kenichi Murakami, Futtsu, JP;
Yoshiyuki Ushigami, Kitakyushu, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
Reheating a grain-oriented electrical steel sheet slab comprising predetermined components to 1280° C. or more and a solid solution temperature of inhibitor substances or more, hot rolling, annealing, and cold rolling it, decarburization annealing it, nitriding it in a strip running state, coating an annealing separator, and finish annealing it during which making a precipitation ratio of N as AlN after hot rolling 20% or less, making a mean grain size of primary recrystallization 7 μm to less than 20 μm, and making a nitrogen increase ΔN in the nitridation within a range of Equation (1) and making nitrogen contents σNand σN(front and back, mass %) of a 20% thickness portion of one surface of the steel strip (sheet) within a range of Equation (2):0.007−([N]−14/48×[Ti])≦ΔN≦[solAl]×14/27−([N]−14/48×[Ti])+0.0025  Equation (1)|σN1−σN2|/ΔN≦0.35  Equation (2).