Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1993-03-19
1994-09-13
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148112, C21D 812
Patent
active
053465598
ABSTRACT:
The present invention provides a process for manufacturing a double oriented electrical steel sheet having a high flux density by suppressing the growth of the secondary recrystallization of {110} <uvw> oriented grains from the surface of the steel sheet in the hot-rolling stage or cold-rolling stage, which process comprises subjecting a hot rolled sheet comprised of 0.8-6.7% by weight of Si, 0.008-0.048% by weight of acid soluble Al, 0.010% by weight or less of N, and the balance being Fe and unavoidable impurities to a cold-rolling at a reduction rate of 40-80%, and then subjecting the resulting sheet to another cold-rolling in the direction vertical to the above cold-rolled direction at the reduction rate of 30-70% in the final thickness, followed by the steps of annealing for the primary recrystallization, applying an annealing separator, and applying finishing annealing for the secondary recrystallization and purification of steel, wherein the rolling in the finishing hot-rolling stage is carried out at the accumulated reduction rate of 20% or more under the condition that the friction coefficient between the rolls and the steel sheet is not more than 0.25; and wherein the accumulated reduction rate in the last three passes in the hot-rolling is not more than 80%; and further, wherein material of more than 1/10 of the total thickness is removed from both surfaces of the hot-rolled sheet; or wherein the cold-rolling is carried out using a work roll having a diameter of not less than 150 mm.
REFERENCES:
patent: 2046717 (1936-07-01), Bitter
patent: 3130093 (1964-04-01), Kohler
patent: 3130095 (1964-04-01), Kohler et al.
patent: 3136666 (1964-06-01), Taguchi et al.
patent: 3163564 (1964-12-01), Taguchi et al.
patent: 4204891 (1980-05-01), Shiozaki et al.
patent: 4406715 (1983-09-01), Nakayama et al.
patent: 4437909 (1984-03-01), Mori et al.
patent: 4997493 (1991-03-01), Ushigami et al.
K. T. Aust, J. W. Rutter: Trans. Met. Soc. AIME 215(1959) pp. 119/127.
Ushigami et al. Abstract of 96th Symposium of Metallurgy Society of Japan, p. 373, 1985.
Arai Satoshi
Senuma Takehide
Suga Yozo
Takahashi Nobuyuki
Ushigami Yoshiyuki
Nippon Steel Corporation
Wyszomierski George
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