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US3366474A
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US
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Process for the production of chrome series and nickel-chrome series stainless steels
Assignee: Nippon Steel Nisshin Co Ltd
•
Filing: 1964-10-28
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Granted: 1968-01-30
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Expires: 1984-10-28
Abstract
No abstract record available.
Inventors
- 👤 Akita Takeo
- 👤 Imatomi Masahei
- 👤 Shindo Hisao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:58
CPC Classifications
C; C22; C22C; C22C33/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A METHOD OF PRODUCING CHROME SERIES AND NICKELCHROME SERIES STAINLESS STEELS, COMPRISING THE STEPS OF CHARGING A MELTING FURNACE WITH A CHARGE WHICH AT LEAST INCLUDES STAINLESS SCRAPS, ORDINARY STEEL SCRAPS AND HIGH CARBON FERROCHROME TOGETHER WITH SLAG-FORMING AGENT IN AN AMOUNT SO AS TO FORM A SLAG OF HIGH CR2O3 CONTENT, COMPLETELY MELTING THE CHARGE IN THE MELTING FURNACE, POURING THE MELT FROM THE MELTING FURNACE INTO A SHAKING LADLE, BLOWING OXYGEN INTO THE MELT TO EFFECT DECARBURIZATION OF THE MELT WHILE AGITATING THE MELT IN THE SHAKING LADLE, ADDING A REDUCING AGENT TO THE MELT TO REDUCE THE CR2O3 WHILE AGITATING THE MELT IN THE SHAKING LADLE, CARRYING OUT THE REDUCTION OF THE CR2O3 CONTAINED IN THE SLAG TO METALLIC CHROMIUM WHICH TRANSFERRED INTO THE MOLTEN STEEL UNTIL THE RESULTANT SLAG CONTAINS MAXIMUM 8.5% OF CR2O3, SAID SLAG FORMING AGENT BEING CHARGED IN AMOUNT SO AS TO RESULT IN A SLAG OF A BASICITY OF 0.9 TO 2.0 ON THE MELT AT THE END OF REDUCTION, AND THEN REMOVING THE RESULTANT SLAG FROM THE MELT.
Claim 2
Independent Claim
177 words
A METHOD OF PRODUCING CHROME SERIES AND NICKELCHROME SERIES STAINLESS STEELS, COMPRISING THE STEPS OF CHARGING A MELTING FURNACE WITH A CHARGE WHICH AT LEAST INCLUDES STAINLESS SCRAPS, ORDINARY STEEL SCRAPS AND HIGH CARBON FERROCHROME TOGETHER WITH SLAG-FORMING AGENT IN AN AMOUNT SO AS TO FORM A SLAG OF HIGH CR2O3 CONTENT, COMPLETELY MELTING THE CHARGE IN THE MELTING FURNACE, POURING THE MELT FROM THE MELTING FURNACE INTO A SHAKING LADLE, BLOWING OXYGEN INTO THE MELT TO EFFECT DECARBURIZATION OF THE MELT WHILE AGITATING THE MELT IN THE SHAKING LADLE, ADDING A REDUCING AGENT TO THE MELT TO REDUCE THE CR2O3 WHILE AGITATING THE MELT IN THE SHAKING LADLE, CARRYING OUT THE REDUCTION OF THE CR2O3 CONTAINED IN THE SLAG TO METALLIC CHROMIUM WHICH TRANSFERRED INTO THE MOLTEN STEEL UNTIL THE RESULTANT SLAG CONTAINS MAXIMUM 8.5% OF CR2O3, SAID SLAG FORMING AGENT BEING CHARGED IN AMOUNT SO AS TO RESULT IN A SLAG OF A BASICITY OF 0.9 TO 2.0 ON THE MELT AT THE END OF REDUCTION, AND THEN REMOVING THE RESULTANT SLAG FROM THE MELT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |