Grain-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-11145446-B2
Application number	US-201816628983-A
Country	US
Kind code	B2
Filing date	Jul 13, 2018
Priority date	Jul 13, 2017
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A grain-oriented electrical steel sheet includes: a steel sheet; an oxide layer including SiO 2 that is formed on the steel sheet; and a tension-insulation coating that is formed on the oxide layer, in which the steel sheet includes, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80% to 7.00%, Mn: 1.00% or less, acid-soluble Al: 0.065% or less, S: 0.013% or less, Cu: 0% to 0.80%, N: 0% to 0.012%, P: 0% to 0.50%, Ni: 0% to 1.00%, Sn: 0% to 0.30%, Sb: 0% to 0.30%, and a remainder of Fe and impurities, the tension-insulation coating includes a chromium compound, and the Fe content in the oxide layer and the tension-insulation coating is 70 mg/m 2 to 250 mg/m 2 .

First claim

What is claimed is:

1. A grain-oriented electrical steel sheet comprising:
a steel sheet;
an oxide layer including SiO 2 that is formed on the steel sheet; and
a tension-insulation coating that is formed on the oxide layer,
wherein the steel sheet includes, as a chemical composition, by mass %,
C: 0.085% or less,
Si: 0.80% to 7.00%,
Mn: 1.00% or less,
acid-soluble Al: 0.065% or less,
S: 0.013% or less,
Cu: 0% to 0.80%,
N: 0% to 0.012%,
P: 0% to 0.50%,
Ni: 0% to 1.00%,
Sn: 0% to 0.30%,
Sb: 0% to 0.30%, and
a remainder of Fe and impurities,
the tension-insulation coating includes a chromium compound, and
a Fe content in the oxide layer and the tension-insulation coating is 70 mg/m 2 to 250 mg/m 2 .

2. The grain-oriented electrical steel sheet according to claim 1 ,
wherein the chemical composition of the steel sheet includes, by mass %, Cu: 0.01% to 0.80%.

Assignees

• Nippon Steel Corp

Inventors

• TAKATANI Shinsuke
• Okumura Shunsuke
• Nagano Shohji
• Kataoka Takashi

Classifications

• C22C38/34

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

• C23C22/00

  Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals · CPC title

• C21D2201/05

  Grain orientation · CPC title

• C22C38/08

  containing nickel {(C22C38/105 takes precedence)} · CPC title

• C22C38/60

  containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur · CPC title