Method of making non-oriented electrical steel sheets having excellent magnetic properties
US5116436A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Jun 13, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1222
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Non-oriented electrical steel sheets having excellent magnetic properties are produced by carrying out a coiling at a low temperature for monitoring the amount of scale generation; de-scaling after hot rolling; and annealing the de-scaled hot rolled sheet in a non-oxidizing atmosphere to thereby minimize the oxidation and nitriding during annealing the hot rolled sheet. By determining a higher heating temperature for hot rolling, a magnetic property (magnetic flux density) is improved, and the hot rolled sheet is subjected to an open coil-annealing and annealing conditions therefor are specified in order to perfectly precipitate re-solute AlN particles by this heating and fully coarsen AlN particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.