Hot rolled electrical steel sheet excellent in magnetic characteristics and corrosion resistance and method for production thereof
US6500278B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2001 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Jan 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/004
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A hot rolled electromagnetic steel sheet having excellent magnetic properties and corrosion resistance is obtained by heating a super-high purity iron comprising Fe: not less than 99.95 mass %, C+N+S: not more than 10 mass ppm, O: not more than 50 mass ppm and the remainder being inevitable impurity to &ggr;-zone and subjecting in this &ggr;-zone to hot rolling at a total rolling reduction of not less than 50% and under condition that at least one pass is a friction coefficient between roll and rolling material of not more than 0.3 and thereafter cooling at an average cooling rate of 0.5˜150° C. over Ar3 transformation point ˜300° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.