Method of producing grain-oriented electrical steel sheet
US8236110B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2008 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Apr 24, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B27/021
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention produces a grain-oriented electrical steel sheet having a primary recrystallization structure in which Goss-oriented crystal grains and crystal grains having a coincidence orientation relationship to the Goss orientation are aligned in the rolling direction. It is characterized heating a slab containing, in mass %, C: 0.025 to 0.10%, Si: 2.5 to 4.5%, Mn: 0.03 to 0.55%, and Al: 0.007 to 0.040% to 1,100 to 1,450° C. or greater; hot rolling the slab to obtain a hot-rolled sheet; annealing the hot-rolled sheet; cold rolling the annealed sheet multiple times with a split-housing reversible cluster rolling mill; and subjecting the cold-rolled sheet to primary recrystallization annealing followed by secondary recrystallization annealing, in which method: (a) a first cold rolling or first and second cold rollings are performed using a small-diameter work roll of 55 mm to less than 105 mm diameter; (b) a second or third cold rolling to a penultimate cold rolling are performed using a large-diameter work roll of 105 mm to less than 150 mm diameter; and (c) a final cold rolling is conducted using a small work roll of a diameter smaller than the diameter of the large-diameter wor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.