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US 2024/0254602 A1Published application
Grain-oriented electrical steel sheet
AssigneeNippon Steel Corporation
InventorsYoshiyuki USHIGAMI, Shinsuke TAKATANI, Masaru TAKAHASHI, Kazutoshi TAKEDA
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Abstract
A grain-oriented electrical steel sheet includes a base steel sheet, an oxide film, and a phosphate-based coating. The phosphate-based coating includes a first crystalline phosphorus oxide whose crystal structure corresponds to Fe2P2O7 and a second crystalline phosphorous oxide whose crystal structure corresponds to Fe7(P2O7)4, and the second crystalline phosphorous oxide includes at least one element selected from a group consisting of V, W, Zr, Co, and Mo.
Claims7
A grain-oriented electrical steel sheet comprising:
- a base steel sheet which is a silicon steel sheet;
- an intermediate layer arranged in contact with the silicon steel sheet;
- and
- an insulation coating arranged in contact with the intermediate layer,
- wherein the intermediate layer is an oxide film satisfying:
- 20 atomic % or more and 70 atomic % or less of a Si content;
- 30 atomic % or more and 80 atomic % or less of an O content;
- less than 20 atomic % of a Mg content;
- less than 5 atomic % of a P content;
- and
- less than 20 atomic % of a Fe content, and
- an average thickness of the oxide film is 2 nm or more and 500 nm or less,
- wherein the insulation coating is a phosphate-based coating satisfying:
- 5 atomic % or more and 30 atomic % or less of a P content;
- 5 atomic % or more and 30 atomic % or less of a Si content;
- 30 atomic % or more and 80 atomic % or less of an O content;
- 1 atomic % or more and less than 25 atomic % of a Fe content;
- less than 1.0 atomic % of a Cr content;
- 0 atomic % or more and 10 atomic % or less of an Al content;
- 0 atomic % or more and 10 atomic % or less of a Mg content;
- 0 atomic % or more and 10 atomic % or less of a Mn content;
- 0 atomic % or more and 10 atomic % or less of a Ni content;
- 0 atomic % or more and 10 atomic % or less of a Zn content;
- 0.1 atomic % or more and 10 atomic % or less in total content of Al, Mg, Mn, Ni, and Zn;
- 0 atomic % or more and 10 atomic % or less of a V content;
- 0 atomic % or more and 10 atomic % or less of a W content;
- 0 atomic % or more and 10 atomic % or less of a Zr content;
- 0 atomic % or more and 10 atomic % or less of a Co content;
- 0 atomic % or more and 10 atomic % or less of a Mo content;
- and
- 0.1 atomic % or more and 10 atomic % or less in total content of V, W, Zr, Co, and Mo, and
- an average thickness of the phosphate-based coating is 0.1 μm or more and 10 μm or less, and
- wherein the phosphate-based coating includes a first crystalline phosphorus oxide whose crystal structure corresponds to Fe2P2O7 and a second crystalline phosphorous oxide whose crystal structure corresponds to Fe2(P2O7)+, and
- the second crystalline phosphorous oxide includes at least one of V, W, Zr, Co, and Mo.
31 more elements
Dependencies are inferred from the claim text.