Method for producing a grain-oriented magnetic steel sheet having good magnetic properties
AssigneeNippon Steel Corporation
InventorsKatsuro Kuroki, Kenzo Iwayama, Takashi Sato
Life of this patent
Estimating the term…
Abstract
A grain oriented magnetic steel sheet having excellent magnetic properties containing not more than 4.5% silicon, in which a <001> axis of individual grains coincides with a rolling direction of the steel sheet, a crystal plane parallel to the steel sheet surface is composed of a {h, k, o} plane which is rotated and dispersed about an axis in the rolling direction, and a tension ranging substantially from 350 to 1500 g/mm.sup.2 is given to the steel sheet in the rolling direction.
Claims4
A method for producing a grain oriented magnetic steel sheet having excellent magnetic properties and containing not more than 4.5% silicon, comprising hot rolling a steel slab prepared by continuous casting, subjecting the hot rolled steel sheet thus obtained to intermediate annealing, then to cold rolling by means of a grooved roll to produce a steel structure in which a <001>
- axis of individual grains coincides with a rolling direction of the steel sheet, a crystal plane (h, k, o) parallel to the steel sheet surface plane is rotated and dispersed about an axis in the rolling direction in a range from 0.degree. to .+-.20.degree., subjecting the cold rolled steel sheet thus obtained to decarburizing annealing, magnesium oxide coating, final annealing and then coating the steel sheet with a coating liquid containing colloidal silica, aluminum phosphate, chromic anhydride and boric acid so as to give a tension during cooling, ranging substantially from 350 to 1500 g/mm.sup.2 in the rolling direction to the steel sheet.
Dependencies are inferred from the claim text.