Process for making stainless steel
Abstract
Abstract AN ECONOMICAL PROCESS FOR MAKING A MOLTEN FERROUS ALLOY CONTAINING FROM ABOUT 5.0 TO 30.0% BY WEIGHT CHROMIUM, AND UP TO ABOUT 25.0% BY WEIGHT NICKEL, WHICH PROCESS INCLUDES THE STEPS OF PREPARING A CHARGE CONSISTING PRIMARILY OF THE ORES OFCHROMIUM AND IRN, SMELTING AND REDUCING SAID CHARGE BY THE SUBMERGED-ARC PROCESS IN A FIRST VESSEL TO YIELD A HIGH CARBON, HIGH SILICON MOLTEN ALLOY, TRANSFERRING SAID ALLOY TO A SECOND VESSEL, DIRECTING GASEOUS OXYGEN THEREAGAINST TO REDUCE THE CARBON AND SILICON, AND THEREAFTER INTRODUCING A MIXTURE OF GASEOUS OXYGEN AND AN INERT GAS INTO SAID MOLTEN ALLOY BELOW THE SURFACE THEREOF TO COMPLETE THE REFINING AND TO MINIMIZE THE LOSS OF CHROMIUM.
Inventors
- 👤 Entremont J D
- 👤 C Taylor
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |