Vanadium-containing alloying additive for steel
Abstract
Abstract VANADIUM-CONTAINING ALLOYING ADDITIVE FOR STEELS IS OBTAINED FROM VANADIC ACID, I.E., VANADIUM PENTAOXIDE OR VANADIUM PENTOXIDE-CONTAINING COMPOSITIONS IN A ONE STAGE PROCESS WITHOUT THE USE OF VACUUM TREATMENT BY THE SOLID-STATE REDUCTION OF VANADIC ACID WITH CARBON UNDER ATMOSPHERIC CONDITIONS AT TEMPERTURES OF FROM 1200 TO 1500*C., TO PRODUCE A SUBSTANCE OF THE FOLLOWING COMPOSITION: PERCENT , FROMVANADIUM 70 TO 85 OXYGEN 2 TO 10 CARBON 5 TO 20 NITROGEN 0.5 TO 4 TO TAKE UP RESIDUAL OXYGEN IN A STEEL-MAKING BATH INTO WHICH SAID ADDITRIVE IS ADDED, SILICON OR ALUMINUM OR A FERROSILICON MAY BE INCORPORATED IN THE ADDITIVE. THE USE OF SUCH AN ADDITIVE IN A STEEL MAKING PROCESS IS PARTICULARLY ADVANTAGEOUS IN THAT THE ADDITIVE DISSOLVES WELL IN THE STEEL BATH DESPITE RESIDUAL OXYGEN IN THE STEEL MAKING BATH. THE HIGH DENSITY OF THE ADDITIVE RESULTS IN IT TAKING UP A POSITION IN THE STEEL BATH BETWEEN THE SLAG AND THE BATH SURFACE, THEREBY EFFECTING A FURTHER IMPROVEMENT IN SOLUTION.
Inventors
- 👤 Hans-Joachim Retelsdorf
- 👤 Rudolf Fichte
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |