Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1998-06-04
2000-04-04
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
H01F 104
Patent
active
060456272
ABSTRACT:
A silicon steel sheet contains 0.01 wt. % or less C, 4 to 10 wt. % Si, 0.5 wt. % or less Mn, 0.01 wt. % or less P, 0.01 wt. % or less S, 0.2 wt. % or less sol. Al, 0.01 wt. % or less N, 0.02 wt. % or less O and the balance being Fe. The silicon steel sheet has grain boundaries and carbides which are precipitated on the grain boundaries. The carbides have an area of 20% or less to an area of the grain boundaries. The steel sheet is cooled at a cooling speed of 5.degree. C./sec. or more in a temperature range of from 300 to 700.degree. C.
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Fujita Koichiro
Hiratani Tatsuhiko
Kasai Shoji
Ninomiya Hironori
Tanaka Yasushi
NKK Corporation
Sheehan John
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