Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1975-04-24
1976-11-09
Satterfield, Walter R.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148112, H01F 104
Patent
active
039909239
ABSTRACT:
A method of producing a grain-oriented electromagnetic steel sheet comprising the step of subjecting a sheet of hot-rolled steel containing silicon less than 4.5% to more than one operation of cold rolling and more than one operation of annealing, so as to set the thickness of said sheet to that of a commercially standard sheet, and also subjecting the sheet to the step of final high-temperature annealing. Prior to said final high-temperature annealing, part of the surface of said sheet is worked for controlling the growth of secondary recrystallization grains by working the sheets such that lines of less than 3.0 mm wide are formed on the surface of the steel sheet spaced apart at intervals of more than 5.0 mm so that the total effect is to produce worked and unworked regions alternatively arranged in lines across the steel sheet. Such working is effected by mechanical plastic working, local thermal treatment and by chemical treatment. The worked regions serve to control the growth of secondary recrystallization.
REFERENCES:
patent: 3159511 (1964-12-01), Taguchi et al.
patent: 3165428 (1965-01-01), Albert et al.
patent: 3347718 (1967-10-01), Carpenter et al.
patent: 3647575 (1972-03-01), Fiedler et al.
patent: 3700506 (1972-10-01), Tanaka
Fukumoto Masahiro
Kuroki Katsuro
Suga Yozo
Takashina Kikuo
Tanaka Osamu
Nippon Steel Corporation
Satterfield Walter R.
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