Production method for grain-oriented electrical steel sheet
US9708682B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 25, 2013 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Dec 25, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Grain-oriented electrical steel sheets with good magnetic properties are industrially stably produced, by using as the material, a steel slab having a predetermined composition, wherein after cold rolling and before the start of secondary recrystallization annealing, the cold rolled sheet is subjected to nitriding treatment with nitrogen content of 50 mass ppm or more and 1000 mass ppm or less, and a total content of 0.2 mass % to 15 mass % of a sulfide and/or sulfate is contained in an annealing separator, and a staying time in the temperature range of 300° C. to 800° C. in the heating stage of secondary recrystallization annealing of 5 hours or more is secured to precipitate silicon nitride (Si3N4) and MnS, and using the silicon nitride in combination with MnS as inhibiting force for normal grain growth to significantly reduce variation of magnetic properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.