Metal treatment – Stock – Magnetic
Patent
1988-04-08
1989-09-05
Sheehan, John P.
Metal treatment
Stock
Magnetic
420 89, 420117, H01F 104
Patent
active
048635324
ABSTRACT:
In a grain-oriented electromagnetic steel sheet which is produced by a process including a cold-rolling step(s), the final reduction ratio of the cold-rolling step(s) being high, a technical means for refining the secondary recrystallized grains is particularly important. One technical means is the incorporation of tin into silicon steel material. This, however, involves a problem because tin incorporated into silicon steel material deteriorates the surface coating which imparts tension to a grain-oriented electromagnetic steel sheet.
The incorporation of copper into silicon steel material has been avoided since it causes secondary recrystallization to be unstable.
The present invention is characterized by the combined incorporation of tin and copper into molten steel so as to simultaneously refine the secondary recrystallized grains and to form a good surface coating. The grain-oriented electromagnetic steel sheet of the present invention contains from 2.5% to less than 4.0% of silicon, from 0.03% to 0.15% of manganese, from 0.03% to 0.5% of tin, and from 0.02% to less than 0.3% of copper.
REFERENCES:
patent: 3159511 (1964-12-01), Taguchi et al.
patent: 3239332 (1966-03-01), Goss
patent: 3770517 (1973-11-01), Gray et al.
patent: 3855018 (1974-12-01), Salsgiver et al.
patent: 3855020 (1974-12-01), Salsgiver et al.
patent: 3873380 (1975-03-01), Malagari
patent: 3929522 (1975-12-01), Salsgiver et al.
patent: 3933024 (1976-01-01), Matsumoto et al.
patent: 3940299 (1976-02-01), Goto et al.
patent: 4046602 (1977-09-01), Stanley
patent: 4113529 (1978-09-01), Fiedler
patent: 4123299 (1978-10-01), Fiedler et al.
patent: 4244757 (1981-01-01), Malagari
patent: 4338144 (1982-07-01), Fiedler
patent: 4493739 (1985-01-01), Fujiwara et al.
Journal of Magnetism and Magnetic Materials 2(1976) 121-131; The Development of Grain Oriented Silicon Steel With High Permeability, S. Taguchi, et al.
Journal of Applied Physics, vol 41, No. 7, 2981-2984, (1970), Effect of Tensile Stress on Total Loss of Single Crystals of Si-Fe, T. Yamamoto et al.
J. App. Phys., vol. 55, 1984, No. 6, Part IIB, pp. 2136-2138, Roles of Sn and Cu in the 0.23 mm Thick Grain Oriented Si Steel, K. Iwayama et al.
Transactions ISIJ, Vol. 17, 1977, pp. 32-43, Review of the Recent Development of Electrical Steel Sheet in Japan, S. Taguchi.
Kuroki Katsuro
Nakashima Shozaburo
Wada Toshiya
Nippon Steel Corporation
Sheehan John P.
LandOfFree
Grain-oriented electromagnetic steel sheet does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Grain-oriented electromagnetic steel sheet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Grain-oriented electromagnetic steel sheet will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-241005