US3009844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the transformation annealing of steels
Assignee: Deutsche Edelstahlwerke AG
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Filing: 1953-11-10
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Granted: 1961-11-21
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Expires: 1973-11-10
Abstract
No abstract record available.
Inventors
- 👤 Connert Winfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:03
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
A PROCESS FOR THE TRANSFORMATION ANNEALING OF A STEEL SELECTED FROM THE GROUP CONSISTING OF HYPEREUTECTOID AND LEDEBURITIC STEELS, BY PROGRESSIVELY PASSING THE STEEL THROUGH A FURNACE THE TEMPERATURE OF WHICH IS ZONALLY REGULATED, WHICH COMPRISES THE STEPS OF (1) HEATING THE STEEL TO A TEMPERATURE BETWEEN 800*C. AND 880*C. AND MAINTAINING THE STEEL AT THAT TEMPERATURE FOR A PERIOD OF FROM THE ORDER OF FROM 1 TO 2 HOURS, (2) COOLING THE STEEL AT ANY DESIRED RATE TO A TEMPERATURE BELOW 700*C. BUT NOT SUBSTANTIALLY BELOW 600*C. (3) IMMEDIATELY REHEATING THE STEEL TO AN ANNEALING TEMPERATURE BETWEEN 740*C. AND 800*C. AND MAINTAINING THE STEEL AT SAID ANNEALING TEMPERATURE FOR A PERIOD OF THE ORDER OF FROM 1 TO 3 HOURS, AND WHEREIN SAID ANNEALING TEMPERATURE IS SELECTED FROM THE LOWER PART OF SAID TEMPERATURE RANGE FOR THE UNALLOYED AND LOW ALLOYED HYPEREUTECTOID STEELS AND IN THE UPPER PART OF SAID TEMPERATURE RANGE FOR HIGH ALLOYED STEELS, (4) COOLING THE STEEL AT ANY DESIRED RATE TO A TEMPERATURE ABOUT 720*C, AND THEREAFTER COOLING SAID STEEL THROUGH THE TEMPERATURE RANGE OF FROM 720*C. TO 680*C. DURING A PERIOD OF TIME OF THE ORDER OF FROM 2 TO 4 HOURS.
Claim 2
Dependent Claim
198 words
A PROCESS FOR THE TRANSFORMATION ANNEALING OF A STEEL SELECTED FROM THE GROUP CONSISTING OF HYPEREUTECTOID AND LEDEBURITIC STEELS, BY PROGRESSIVELY PASSING THE STEEL THROUGH A FURNACE THE TEMPERATURE OF WHICH IS ZONALLY REGULATED, WHICH COMPRISES THE STEPS OF (1) HEATING THE STEEL TO A TEMPERATURE BETWEEN 800*C. AND 880*C. AND MAINTAINING THE STEEL AT THAT TEMPERATURE FOR A PERIOD OF FROM THE ORDER OF FROM 1 TO 2 HOURS, (2) COOLING THE STEEL AT ANY DESIRED RATE TO A TEMPERATURE BELOW 700*C. BUT NOT SUBSTANTIALLY BELOW 600*C. (3) IMMEDIATELY REHEATING THE STEEL TO AN ANNEALING TEMPERATURE BETWEEN 740*C. AND 800*C. AND MAINTAINING THE STEEL AT SAID ANNEALING TEMPERATURE FOR A PERIOD OF THE ORDER OF FROM 1 TO 3 HOURS, AND WHEREIN SAID ANNEALING TEMPERATURE IS SELECTED FROM THE LOWER PART OF SAID TEMPERATURE RANGE FOR THE UNALLOYED AND LOW ALLOYED HYPEREUTECTOID STEELS AND IN THE UPPER PART OF SAID TEMPERATURE RANGE FOR HIGH ALLOYED STEELS, (4) COOLING THE STEEL AT ANY DESIRED RATE TO A TEMPERATURE ABOUT 720*C, AND THEREAFTER COOLING SAID STEEL THROUGH THE TEMPERATURE RANGE OF FROM 720*C. TO 680*C. DURING A PERIOD OF TIME OF THE ORDER OF FROM 2 TO 4 HOURS.
References Cited (Backward Citations)
US2413602A
Cited
US2585277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-20 | 1965-05-22 | 1965-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-20 | 1969-05-22 | 1969-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-20 | 1973-05-22 | 1973-11-21 | $7700.00 | Window Closed / Lapsed |