Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Masahide Urago

Kazumi Mizukami

Yoshiyuki Ushigami

Atsushi Shibayama

Fumiaki Takahashi

Shuichi Nakamura

Masato Yasuda

Norikazu Fujii

Nobusato Morishige

Takeru Ichie

Norihiro Yamamoto

Fuminobu Murakami

Daichi Hamada

Daisuke Itabashi

There is provided a non-oriented electrical steel sheet in which, in a cross section of a base material in a sheet thickness direction, the number density Nof precipitates with an equivalent circle diameter of 50 to 500 nm present in a range of 2.0 to 5.0 μm from the surface of the base material in the sheet thickness direction is 0.30 pieces/μmor less, and the relationship between the number density Nand the number density Nof precipitates with an equivalent circle diameter of 50 to 500 nm present in a range from the surface of the base material to 2.0 μm satisfies Formula (1):()/()≤0.5  Formula (1).

Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet

A grain-oriented electrical steel sheet being a grain-oriented electrical steel sheet containing Si of 0.8 mass % to 7 mass %, Mn of 0.05 mass % to 1 mass %, B of 0.0005 mass % to 0.0080 mass %, each content of Al, C, N, S, and Se of 0.005 mass % or less, and a balance being composed of Fe and inevitable impurities and having a glass coating film made of composite oxide mainly composed of forsterite on the steel sheet surface, in which when glow discharge optical emission spectrometry (GDS) to the surface of a secondary coating film formed on the surface of the glass coating film under a predetermined condition is performed, a peak, of B, in emission intensity having a peak position in emission intensity different from a peak position, of Mg, in emission intensity is obtained and the peak position, of B, in emission intensity from the steel sheet surface is deeper than the peak position, of Mg, in emission intensity.

Grain-oriented electrical steel sheet and manufacturing method thereof

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Tokyo, Japan

Masahide Urago