Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1990-10-26
1992-08-25
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, H01F 104
Patent
active
051415739
ABSTRACT:
An electrical steel sheet having a very small watt loss can be provided by improving the conventional magnetic domain-controlling treatment. Namely, a high-flux density, grain-oriented electrical steel sheet having a superior watt loss characteristic and a flux density of at least 1.88 T at a magnetizing force of 800 A/m, which comprises, as the steel sheet components, up to 0.0030% by weight of C, 2.8 to 4.5% by weight of Si, 0.045 to 0.100% by weight of Mn, up to 0.0050% by weight of one or two elements selected from the group consisting of S and Se, up to 0.0050% by weight of Al, up to 0.0030% by weight of N, 0.03 to 0.25% by weight of Sn, 0.35 to 2.0% by weight of Ni and if necessary, 0.03 to 0.08% by weight of Cu, with the balance consisting of Fe and unavoidable impurities, wherein a tension coating is formed on the surface of a steel sheet and after the secondary recrystallization, the surface of the steel sheet is subjected to an artificial magnetic domain-controlling treatment in a direction substantially orthogonal to the rolling direction, and a process for the preparation of this steel sheet, are disclosed.
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Patents Abstracts of Japan, vol. 10, No. 56 (C-331) [2113] Mar. 26, 1986.
European Search Report EP 89 10 7068.
Nippon Steel Corporation
Sheehan John P.
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