US3668016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cold-rolled steel plate high in the cold-formability
Assignee: Nippon Steel Corp
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Filing: 1969-03-03
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Granted: 1972-06-06
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Expires: 1989-03-03
Abstract
Abstract COLD-ROLLED STEEL HAVING EXCELLENT COLD-FORMABILITY IS MADE BY POURING INTO A MOLD A MOLTEN STEEL HAVING A COMPOSITION OF C$0.07 WT. PERCENT, 0.04 TO 0.20 WT. PERCENT MN, 0.004 TO 0.020 WT. PERCENT S, THE RATIO OF MN TO S BEING AT LEAST 7, NOT MORE THAN 0.0030% N, AND THE BALANCE IRON AND IMPURITIES. THE MOLTEN STEEL IS ALLOWED TO RIM IN THE MOLD FOR A TIME INTERVAL. THEN THE CORE OF THE MOLTEN STEEL IS KILLED BY ADDING AL TO THE MOLTEN STEEL AFTER THE TIME INTERVAL, SUCH THAT THE ACID-SOLUBLE AL IN THE REMAINING MOLTEN STEEL IS MORE THAN 0.010% TO OBTAIN AN INGOT. THE INGOT IS THEN SUBJECTED TO HOTROLLING, COLD-ROLLING RECRYSTALLIZING AND ANNEALING.
Inventors
- 👤 Mineo Shimizu
- 👤 Hiroshi Takechi
- 👤 Hiroyuki Kajioka
- 👤 Minoru Kawaharada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:23
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/076; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/041; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |