US3788903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of processing steel material having high austenitic grain-coarsening temperature
Assignee: Kobe Steel Ltd
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Filing: 1971-04-15
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Granted: 1974-01-29
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Expires: 1991-04-15
Abstract
Abstract A METHOD OF PROCESSING STEEL MATERIAL HAVING A HIGH AUSTENITIC GRAIN-COARSENING TEMPERATURE AND AN ABNORMAL GRAIN GROWTH CURVE OF COLD WORKED AUSTENITIC GRAIN, WHICH COMPRISES HEATING SAID STEEL MATERIAL AT A TEMPERATURE OF FROM THE FERRITE RECRYSTALLIZATION TEMPERATURE TO THE A3 TRANSFORMATION POINT FOR MORE THAN FIVE MINUTES TO CAUSE RECRYSTALLIZATION. THE TECHNIQUE PREVENTS THE FORMATION OF MIXED GRAINS UPON AUSTENITIZING AND THEREBY PRESERVES THE MECHANICAL PROPERTIES OF THE STEEL MATERIAL.
Inventors
- 👤 A Suzuki
- 👤 S Kinoshita
- 👤 T Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:51
CPC Classifications
C; C21; C21D; C21D8/00
Claims Analysis
Total Claims: 0
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References 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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |