Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1994-06-14
1996-02-06
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148112, H01F 104
Patent
active
054893429
ABSTRACT:
The present invention provides a method of manufacturing a silicon steel sheet having grains precisely arranged in the Goss orientation, comprising the steps of preparing a steel material containing 0.01 wt % or less of C, 2.5 to 7.0 wt % of Si, 0.01 wt % or less of S, 0.01 wt % or less of Al, 0.01 wt % or less of N, subjecting the steel material to hot rolling maintained 1000.degree. C. or higher such that the temperature of the rolled material at an end of the hot rolling step falls within the range of 700.degree. to 950.degree. C., subjecting the steel material to a primary cold rolling process at a rolling reduction of 30 to 85%, annealing the steel material at a temperature of 600.degree. to 900.degree. C., subjecting the steel material to a secondary cold rolling process at a rolling reduction of 40 to 80%, annealing the steel material again at a temperature of 600.degree. to 900.degree. C., subjecting the steel material to a tertiary cold rolling process at a rolling reduction of 50 to 75%, and annealing the steel material in a reducing atmosphere, or in a non-oxidizing atmosphere having an oxygen partial pressure of 0.5 Pa or less, or in a vacuum having an oxygen partial pressure of 0.5 Pa or less, at a temperature in the range of 1000.degree. to 1300.degree. C.
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Patent Abstracts of Japan, vol. 14, No. 232 (C-719) (4175), May 17, 1990; & JP-A-257635 (Babcock Hitachi) Feb. 27, 1990.
Arai Ken-ichi
Hiura Akira
Ishiyama Kazushi
Namikawa Misao
Tanaka Yasushi
NKK Corporation
Sheehan John
LandOfFree
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