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:
Mar. 25, 1997
Filed:
Jul. 15, 1991
Yozo Suga, Kitakyushu, JP;
Hotaka Honma, Kitakyushu, JP;
Yoshiyuki Ushigami, Kitakyushu, JP;
Syuji Kitahara, Kitakyushu, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention provides a thin sheet product having a combination of excellent magnetic properties inherent in the steel having a silicon content of 6.5% or near 6.5% with a further lowered iron loss property, particularly in a high frequency region, through the production of a magnetic thin steel sheet having a thickness of 0.23 mm or less by cold-rolling a steel sheet comprising by weight not more than that 0.006% of carbon, 5.0 to 7.1% of silicon, 0.07 to 0.30% of manganese, not more than 0.007% of sulfur, 0.006 to 0.038% of acid soluble aluminum and 8 to 30 ppm of total nitrogen with the balance consisting of iron and unavoidable impurities at a sheet temperature in the range of from 120.degree. to 350.degree. C. optionally after annealing the sheet at a temperature in the range of from 750.degree. to 1020.degree. C., and annealing the cold-rolled sheet at a temperature in the range of from 800.degree. to 1020.degree. C. for recrystallization and grain growth, to thereby prepare a magnetic steel sheet having a small thickness of 0.23 mm or less.