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Silicon steel sheets having low iron loss and method of producing the same
| Details |
Inventors: Ishitobi, Hirotake; Nishike, Ujihiro; Sujita, Shigeko; Kami, Tikara; Kobayashi, Yasuhiro;
Assignee: Kawasaki Steel Corporation (JP)
Primary Examiner: Sheehan; John P.
Assistant Examiner:
Attorney, Agent or Firm: Miller & Christenbury
A silicon-containing steel sheet having a low iron loss has such a crystal structure that crystal grains having an inclination angle of {110} face of not more than 10.degree. with respect to the sheet surface are included in an amount of not less than 80 vol % and exhibit a graining surface pattern in which boundaries of these crystal grains form stepwise difference or groove of not less than 0.4 .mu.m as a maximum height. This sheet is produced by subjecting a grain oriented silicon steel sheet after final annealing to a magnetically smoothening treatment by electrolysis in an squeous solution containing at least one of water soluble halides. |
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DETAILED DESCRIPTION It is, therefore, an object of the invention to advantageously solve the aforementioned problems and to provide silicon-containing steel sheets having a magnetically smooth surface, i.
e.
a surface not obstructing the movement of magnetic domain walls which cause hysteresis loss, without performing a mirror finishing treatment through the electrolytic or chemical polishing but having an excellent adhesion property to a coating.
The inventors have made various studies with respect to the influence of the surface upon the iron loss and found the following.
Namely, a first finding lies in that a factor largely influencing the hysteresis loss is mainly an oxide existent on the surface, a mirror state is not necessarily required to make the movement of magnetic domain walls smooth.
The term "mirror state" used herein is an optical concept and is not quantitatively defined, but usually indicates that the surface roughness is not more than 0.
4 .
mu.
m, particularly not more than 0.
1 .
mu.
m as a center-line average roughness.
FIG.
2 shows a comparison in iron loss among a conventional grain oriented silicon steel sheet having an oxide an its surface, a grain oriented silicon steel sheet when a conventional sheet is subjected to a mirror finishing treatment, and a grain oriented silicon steel sheet when the mirror finished surface is subjected to pickling.
As seen from FIG.
2, the iron loss property is not so degraded even if the mirror state is lost by pickling.
Thus, in order to obtain a low hysteresis loss silicon steel sheet, the mirror surface is not always required, and the surface of the steel sheet is sufficient to be a magnetically smooth surface, i.
e.
a surface not obstructing the movement of magnetic domains which causes hysteresis loss.
Therefore, electrolytic polishing and chemical polishing are not indispensable conditions, and the surface treating means may be selected more freely.
However, the introduction of strain into the surface of the silicon steel sheet during the magnetic smoothening process degrades the iron loss property, so that it should be avoided as far as possible, and hence a chemical strain-free polishing process is suitable
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