Method of producing a killed steel
Abstract
Abstract A method of producing a fully killed steel of low aluminum content and substantially free of aluminum oxides, without the need for the addition of other metallic or carbidic deoxidizers such as silicon, titanium, silicon carbide, carbon, etc. The steel is produced by the addition of aluminum to molten steel in an amount sufficient to kill the steel and provide a dissolved aluminum content in the order of between 0.03 to 0.06 percent. The steel is then stirred at a controlled rate in contact with an oxidizing slag until the amount of dissolved aluminum remaining in the steel is between 0.005 percent and 0.020 percent. The steel thus produced retains the mode of solidification of a killed steel, is low in dissolved oxygen and aluminum rich oxides, and is especially suitable for continuous casting in that it can be poured through relatively small diameter nozzles without plugging.
Inventors
- 👤 L Barnhardt
- 👤 B Whitmore
Bibliographic Details
Claims Analysis
Total Claims: 3References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |