Grain oriented electrical steel sheet and producing method thereof

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United States of America Patent

PATENT NO 12123068
SERIAL NO

17258968

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Abstract

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A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.010% or less of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.020% or less of S; and a balance comprising Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 μm at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, when a surface of the intermediate oxide film layer is analyzed by an infrared reflection spectroscopy, a peak intensity IA at 1250 cm−1 and a peak intensity IB at 1200 cm−1 satisfy IB/IA≥0.010.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 1008071 ?1008071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujii, Hiroyasu Tokyo, JP 60 275
Kataoka, Takashi Tokyo, JP 81 1132
Nakamura, Shuichi Tokyo, JP 77 719
Okumura, Shunsuke Tokyo, JP 32 63
Ushigami, Yoshiyuki Tokyo, JP 83 295

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