Grain-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-12065713-B2
Application number	US-202017761055-A
Country	US
Kind code	B2
Filing date	Sep 17, 2020
Priority date	Sep 18, 2019
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A grain-oriented electrical steel sheet comprises a base steel sheet and a glass coating that is formed on the surface of the base steel sheet, and is characterized in that: the base steel sheet contains as chemical components, in mass %, 0.010% or less of C, from 2.00% to 4.00% of Si, from 0.05% to 1.00% of Mn, from 0.010% to 0.065% of Al, 0.004% or less of N and 0.010% or less of S, with the balance of Fe and impurities, wherein the oxygen concentration in the glass coating and the base steel sheet is 2,500 ppm or less; and if I Al_1 is the first peak intensity of Al and I Al_2 is the second peak intensity of Al in the concentration profile of Al, the relationship of mathematical formula (1) I Al_1 <I Al_2 is satisfied.

First claim

The invention claimed is:

1. A grain-oriented electrical steel sheet comprising
a base steel sheet and
a glass coating that is formed on a surface of the base steel sheet,
characterized in that the base steel sheet contains as chemical components, in mass %, 0.010% or less of C, from 2.00% to 4.00% of Si, from 0.05% to 1.00% of Mn, from 0.010% to 0.065% or less of Al, 0.004% or less of N and 0.010% or less of S, with a balance of Fe and impurities;
an oxygen concentration in the glass coating and the base steel sheet is more than 500 ppm and 2,500 ppm or less; and
a concentration profile of Al obtained by glow discharge optical emission spectrometry (GDS) has at least two peaks,
in which each Al peak is set as a first peak and a second peak in order from a side closer to a surface of the glass coating opposite from the base steel sheet, and when I Al_1 is the first peak intensity of Al and I Al_2 is the second peak intensity of Al, formula (1) is satisfied,
I Al_1 <I Al_2   Formula (1).

2. The grain-oriented electrical steel sheet according to claim 1 , characterized in that in a vertical cross section of a surface layer portion of the base steel sheet in a thickness direction, which is parallel to a rolling direction of the base steel sheet, a region within a range from the surface of the glass coating to a depth of 10 μm in a direction to a center of a thickness of the base steel sheet comprises Al-containing precipitates having a circular equivalent diameter of 1 μm or more and being scattered in the rolling direction at an average frequency of 50 pieces/mm or more.

Assignees

• Nippon Steel Corp

Inventors

• Yasuda Masato
• Aramaki Takeo
• Yano Shinya
• Arita Yoshihiro
• Kataoka Takashi
• Murakami Kenichi

Classifications

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• H01F1/147

  Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} · CPC title

• C22C2202/02

  Magnetic · CPC title

• C22C38/34

  with more than 1.5% by weight of silicon · CPC title

• C22C38/16

  containing copper · CPC title