Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1985-05-24
1987-02-10
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148111, 148 28, H01F 104
Patent
active
046421416
ABSTRACT:
A grain-oriented silicon steel sheet having high magnetic induction and low iron loss can be obtained by adhering uniformly at least one member selected from the group consisting of elements of Ge, Sn, Pb, As, Bi and Zn and compounds containing these elements to the surfaces of a silicon steel sheet before or after the decarburization annealing in a method for producing grain-oriented silicon steel sheets. According to this method, a hot rolled steel sheet is subjected to at least one cold rolling, the finally cold rolled steel sheet is subjected to a decarburization annealing, and the decarburized steel sheet is applied with an annealing separator consisting mainly of MgO and then subjected to a final annealing, or by carrying out the adhesion treatment of element in combination with a preliminary annealing before the decarburization annealing in the above described method, or by using the annealing separator further containing Bi or a Bi-containing compound in the above described method.
REFERENCES:
patent: 3932201 (1976-01-01), Steger
patent: 3956030 (1976-05-01), Lee et al.
patent: 4171994 (1979-10-01), Miller
Iida Yoshiaki
Iwamoto Katsuo
Kawasaki Steel Corporation
Sheehan John P.
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