Method for producing nonoriented silicon electrical sheet steel
Abstract
Abstract A nonoriented electrical sheet steel containing not more than 0.03 percent carbon and from about 0.5 percent to about 4.5 percent silicon and a process for manufacturing said electrical sheet steel. The process includes preparing low carbon sheet steel by conventional methods of melting, pouring and rolling, coating the surfaces of the sheet steel with a layer of siliconcontaining powder, compacting the powder onto the sheet and heat treating the composite thus formed in a protective environment to cause a solid-state diffusion of silicon into the sheet steel. The core losses of electrical sheet steel thus prepared are equivalent to or better than electrical sheet steel of the same silicon content and gage prepared by additions of silicon to the steel while it is in a molten state.
Inventors
- 👤 Paik Woo Shin
- 👤 Edward H Mayer
Bibliographic Details
Claims Analysis
Total Claims: 1References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |